main..be03546 · reshape

git.iko.soy/reshape

17 files changed+198−1539

unifiedsplit

.github/workflows/lint.yaml+3−3 .github/workflows/publish-crate.yaml−20 .github/workflows/publish-docker.yaml−25 Cargo.toml+3−3 Dockerfile+1−1 README.md+76−220 src/lib.rs+3−6 src/migrations/add_column.rs+58−214 src/migrations/alter_column.rs+1−1 src/migrations/common.rs+9−14 src/migrations/create_table.rs+8−121 src/migrations/mod.rs+1−7 src/migrations/remove_column.rs+34−339 src/schema.rs+1−1 tests/add_column.rs−99 tests/complex.rs−379 tests/remove_column.rs−86

.github/workflows/lint.yaml+3−3

@@ -15,7 +15,7 @@ jobs:

1515 runs-on: ubuntu-latest

1616 steps:

1717 - name: Checkout

18− uses: actions/checkout@v4

18+ uses: actions/checkout@v2

1919 - name: Select Rust toolchain with Clippy

2020 uses: actions-rs/toolchain@v1

2121 with:

@@ -23,6 +23,6 @@ jobs:

2323 components: clippy

2424 override: true

2525 - name: Use cache for Rust dependencies

26− uses: Swatinem/rust-cache@v2

26+ uses: Swatinem/rust-cache@v1

2727 - name: Lint using Clippy

28− run: cargo clippy

28+ run: cargo clippy

.github/workflows/publish-crate.yamldeleted−20

@@ -1,20 +0,0 @@

1−name: Publish crate

2−

3−on: workflow_dispatch

4−

5−jobs:

6− publish-crate:

7− runs-on: ubuntu-latest

8− steps:

9− - name: Checkout

10− uses: actions/checkout@v2

11− - name: Select Rust toolchain

12− uses: actions-rs/toolchain@v1

13− with:

14− toolchain: stable

15− - name: Publish to crates.io

16− uses: actions-rs/cargo@v1

17− with:

18− command: publish

19− env:

20− CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}

.github/workflows/publish-docker.yamldeleted−25

@@ -1,25 +0,0 @@

1−name: Publish Docker image

2−

3−on:

4− workflow_dispatch:

5− inputs:

6− version:

7− description: "Version (without 'v' prefix)"

8− required: true

9− type: string

10−

11−jobs:

12− publish-docker:

13− runs-on: ubuntu-latest

14− steps:

15− - name: Checkout

16− uses: actions/checkout@v2

17− - name: Log in to Docker

18− env:

19− DOCKER_PASSWORD: ${{ secrets.DOCKER_ACCESS_TOKEN }}

20− run: |

21− docker login -u ${{ secrets.DOCKER_USER }} -p $DOCKER_PASSWORD

22− - name: Build Docker image

23− run: docker build . --tag ${{ secrets.DOCKER_USER }}/reshape:${{ inputs.version }} --tag ${{ secrets.DOCKER_USER }}/reshape:latest

24− - name: Push Docker image

25− run: docker push --all-tags ${{ secrets.DOCKER_USER }}/reshape

Cargo.toml+3−3

@@ -1,6 +1,6 @@

11[package]

22name = "reshape"

3−version = "0.7.0"

3+version = "0.6.1"

44description = "An easy-to-use, zero-downtime schema migration tool for Postgres"

55homepage = "https://github.com/fabianlindfors/reshape"

66documentation = "https://github.com/fabianlindfors/reshape"

@@ -9,7 +9,7 @@ license = "MIT"

99keywords = ["postgres", "migrations"]

1010edition = "2021"

1111authors = ["Fabian Lindfors"]

12−rust-version = "1.70"

12+rust-version = "1.58"

1313

1414[dependencies]

1515postgres = { version = "0.19.2", features = ["with-serde_json-1"] }

@@ -23,4 +23,4 @@ version = "3.0.0"

2323colored = "2"

2424rand = "0.8"

2525dotenv = "0.15.0"

26−lexical-sort = "0.3.1"

26+lexical-sort = "0.3.1"

Dockerfile+1−1

@@ -1,4 +1,4 @@

1−FROM rust:1.70.0 AS builder

1+FROM rust:1.58.0 AS builder

22WORKDIR /usr/src/reshape

33COPY . .

44RUN cargo build --release

README.md+76−220

@@ -2,54 +2,54 @@

33[![Test status badge](https://github.com/fabianlindfors/Reshape/actions/workflows/test.yaml/badge.svg)](https://github.com/fabianlindfors/reshape/actions/workflows/test.yaml) [![Latest release](https://shields.io/github/v/release/fabianlindfors/reshape?display_name=tag&sort=semver&color=blue)](https://github.com/fabianlindfors/reshape/releases)

5−> Also check out [ReshapeDB](https://reshapedb.com), a new database built from the ground up to make zero-downtime schema and data migrations as simple and safe as possible. If you'd like to chat about it, please [reach out](contact@reshapedb.com)!

6−

75Reshape is an easy-to-use, zero-downtime schema migration tool for Postgres. It automatically handles complex migrations that would normally require downtime or manual multi-step changes. During a migration, Reshape ensures both the old and new schema are available at the same time, allowing you to gradually roll out your application. It will also perform all changes without excessive locking, avoiding downtime caused by blocking other queries. For a more thorough introduction to Reshape, check out the [introductory blog post](https://fabianlindfors.se/blog/schema-migrations-in-postgres-using-reshape/).

97Designed for Postgres 12 and later.

108

9+*Note: Reshape is **experimental** and should not be used in production. It can (and probably will) break your application.*

10+

1111- [How it works](#how-it-works)

1212- [Getting started](#getting-started)

13− - [Installation](#installation)

14− - [Creating your first migration](#creating-your-first-migration)

15− - [Preparing your application](#preparing-your-application)

16− - [Running your migration](#running-your-migration)

17− - [Using during development](#using-during-development)

13+ - [Installation](#installation)

14+ - [Creating your first migration](#creating-your-first-migration)

15+ - [Preparing your application](#preparing-your-application)

16+ - [Running your migration](#running-your-migration)

17+ - [Using during development](#using-during-development)

1818- [Writing migrations](#writing-migrations)

19− - [Basics](#basics)

20− - [Tables](#tables)

21− - [Create table](#create-table)

22− - [Rename table](#rename-table)

23− - [Remove table](#remove-table)

24− - [Add foreign key](#add-foreign-key)

25− - [Remove foreign key](#remove-foreign-key)

26− - [Columns](#columns)

27− - [Add column](#add-column)

28− - [Alter column](#alter-column)

29− - [Remove column](#remove-column)

30− - [Indices](#indices)

31− - [Add index](#add-index)

32− - [Remove index](#remove-index)

33− - [Enums](#enums)

34− - [Create enum](#create-enum)

35− - [Remove enum](#remove-enum)

36− - [Custom](#custom)

37− - [Complex changes across tables](#complex-changes-across-tables)

19+ - [Basics](#basics)

20+ - [Tables](#tables)

21+ - [Create table](#create-table)

22+ - [Rename table](#rename-table)

23+ - [Remove table](#remove-table)

24+ - [Add foreign key](#add-foreign-key)

25+ - [Remove foreign key](#remove-foreign-key)

26+ - [Columns](#columns)

27+ - [Add column](#add-column)

28+ - [Alter column](#alter-column)

29+ - [Remove column](#remove-column)

30+ - [Indices](#indices)

31+ - [Add index](#add-index)

32+ - [Remove index](#remove-index)

33+ - [Enums](#enums)

34+ - [Create enum](#create-enum)

35+ - [Remove enum](#remove-enum)

36+ - [Custom](#custom)

3837- [Commands and options](#commands-and-options)

39− - [`reshape migration start`](#reshape-migration-start)

40− - [`reshape migration complete`](#reshape-migration-complete)

41− - [`reshape migration abort`](#reshape-migration-abort)

42− - [`reshape schema-query`](#reshape-schema-query)

43− - [Connection options](#connection-options)

38+ - [`reshape migration start`](#reshape-migration-start)

39+ - [`reshape migration complete`](#reshape-migration-complete)

40+ - [`reshape migration abort`](#reshape-migration-abort)

41+ - [`reshape schema-query`](#reshape-schema-query)

42+ - [Connection options](#connection-options)

4443- [License](#license)

4544

45+

4646## How it works

4747

4848Reshape works by creating views that encapsulate the underlying tables, which your application will interact with. During a migration, Reshape will automatically create a new set of views and set up triggers to translate inserts and updates between the old and new schema. This means that every deployment is a three-phase process:

4949

50501. **Start migration** (`reshape migration start`): Sets up views and triggers to ensure both the new and old schema are usable at the same time.

51512. **Roll out application**: Your application can be gradually rolled out without downtime. The existing deployment will continue using the old schema whilst the new deployment uses the new schema.

52−3. **Complete migration** (`reshape migration complete`): Removes the old schema and any intermediate data and triggers.

52+3. **Complete migration** (`reshape migration complete`): Removes the old schema and any intermediate data and triggers.

5353

5454If the application deployment fails, you should run `reshape migration abort` which will roll back any changes made by `reshape migration start` without losing data.

5555

@@ -71,7 +71,7 @@ cargo install reshape

7171

7272#### Docker

7373

74−Reshape is available as a Docker image on [Docker Hub](https://hub.docker.com/repository/docker/fabianlindfors/reshape).

74+Reshape is available as a Docker image on [Docker Hub](https://hub.docker.com/repository/docker/fabianlindfors/reshape).

7575

7676```shell

7777docker run -v $(pwd):/usr/share/app fabianlindfors/reshape reshape migration start

@@ -167,9 +167,9 @@ Every action has a `type`. The supported types are detailed below.

167167

168168#### Create table

169169

170−The `create_table` action will create a new table with the specified columns, indices and constraints. You can optionally provide an `up` option to backfill values from an existing table.

170+The `create_table` action will create a new table with the specified columns, indices and constraints.

171171

172−_Example: create a `customers` table with a few columns and a primary key_

172+*Example: create a `customers` table with a few columns and a primary key*

173173

174174```toml

175175[[actions]]

@@ -187,13 +187,13 @@ primary_key = ["id"]

187187 type = "TEXT"

188188

189189 # Columns default to nullable

190− nullable = false

190+ nullable = false

191191

192192 # default can be any valid SQL value, in this case a string literal

193− default = "'PLACEHOLDER'"

193+ default = "'PLACEHOLDER'"

194194```

195195

196−_Example: create `users` and `items` tables with a foreign key between them_

196+*Example: create `users` and `items` tables with a foreign key between them*

197197

198198```toml

199199[[actions]]

@@ -226,34 +226,11 @@ primary_key = ["id"]

226226 referenced_columns = ["id"]

227227```

228228

229−_Example: create `profiles` table based on existing `users` table_

230−

231−```toml

232−[[actions]]

233−type = "create_table"

234−name = "profiles"

235−primary_key = ["user_id"]

236−

237− [[actions.columns]]

238− name = "user_id"

239− type = "INTEGER"

240−

241− [[actions.columns]]

242− name = "user_email"

243− type = "TEXT"

244−

245− # Backfill from `users` table and copy `users.email` to `user_email` column

246− # This will perform an upsert based on the primary key to avoid duplicate rows

247− [actions.up]

248− table = "users"

249− values = { user_id = "id", user_email = "email" }

250−```

251−

252229#### Rename table

253230

254231The `rename_table` action will change the name of an existing table.

255232

256−_Example: change name of `users` table to `customers`_

233+*Example: change name of `users` table to `customers`*

257234

258235```toml

259236[[actions]]

@@ -266,7 +243,7 @@ new_name = "customers"

266243

267244The `remove_table` action will remove an existing table.

268245

269−_Example: remove `users` table_

246+*Example: remove `users` table*

270247

271248```toml

272249[[actions]]

@@ -278,7 +255,7 @@ table = "users"

278255

279256The `add_foreign_key` action will add a foreign key between two existing tables. The migration will fail if the existing column values aren't valid references.

280257

281−_Example: create foreign key from `items` to `users` table_

258+*Example: create foreign key from `items` to `users` table*

282259

283260```toml

284261[[actions]]

@@ -295,7 +272,7 @@ table = "items"

295272

296273The `remove_foreign_key` action will remove an existing foreign key. The foreign key will only be removed once the migration is completed, which means that your new application must continue to adhere to the foreign key constraint.

297274

298−_Example: remove foreign key `items_user_id_fkey` from `users` table_

275+*Example: remove foreign key `items_user_id_fkey` from `users` table*

299276

300277```toml

301278[[actions]]

@@ -308,9 +285,9 @@ foreign_key = "items_user_id_fkey"

308285

309286#### Add column

310287

311−The `add_column` action will add a new column to an existing table. You can optionally provide an `up` setting. This should be an SQL expression which will be run for all existing rows to backfill the new column. `up` may also reference another table to perform cross-table migrations (see ["Complex changes across tables"](#complex-changes-across-tables)).

288+The `add_column` action will add a new column to an existing table. You can optionally provide an `up` setting. This should be an SQL expression which will be run for all existing rows to backfill the new column.

312289

313−_Example: add a new column `reference` to table `products`_

290+*Example: add a new column `reference` to table `products`*

314291

315292```toml

316293[[actions]]

@@ -324,7 +301,7 @@ table = "products"

324301 default = "10"

325302```

326303

327−_Example: replace an existing `name` column with two new columns, `first_name` and `last_name`_

304+*Example: replace an existing `name` column with two new columns, `first_name` and `last_name`*

328305

329306```toml

330307[[actions]]

@@ -360,7 +337,7 @@ column = "name"

360337down = "first_name || ' ' || last_name"

361338```

362339

363−_Example: extract nested value from unstructured JSON `data` column to new `name` column_

340+*Example: extract nested value from unstructured JSON `data` column to new `name` column*

364341

365342```toml

366343[[actions]]

@@ -375,25 +352,6 @@ up = "data['path']['to']['value'] #>> '{}'"

375352 type = "TEXT"

376353```

377354

378−_Example: duplicate `email` column from `users` to `profiles` table_

379−

380−```toml

381−# `profiles` has `user_id` column which maps to `users.id`

382−[[actions]]

383−type = "add_column"

384−table = "profiles"

385−

386− [actions.column]

387− name = "email"

388− type = "TEXT"

389− nullable = false

390−

391− # When `users` is updated in the old schema, we write the email value to `profiles`

392− [actions.up]

393− table = "users"

394− value = "email"

395− where = "user_id = id"

396−```

397355

398356#### Alter column

399357

@@ -401,7 +359,7 @@ The `alter_column` action enables many different changes to an existing column,

401359

402360When performing more complex changes than a rename, `up` and `down` should be provided. These should be SQL expressions which determine how to transform between the new and old version of the column. Inside those expressions, you can reference the current column value by the column name.

403361

404−_Example: rename `last_name` column on `users` table to `family_name`_

362+*Example: rename `last_name` column on `users` table to `family_name`*

405363

406364```toml

407365[[actions]]

@@ -413,7 +371,7 @@ column = "last_name"

413371 name = "family_name"

414372```

415373

416−_Example: change the type of `reference` column from `INTEGER` to `TEXT`_

374+*Example: change the type of `reference` column from `INTEGER` to `TEXT`*

417375

418376```toml

419377[[actions]]

@@ -428,7 +386,7 @@ down = "CAST(reference AS INTEGER)" # Converts from text value to integer

428386 type = "TEXT" # Previous type was 'INTEGER'

429387```

430388

431−_Example: increment all values of an `index` column by one_

389+*Example: increment all values of an `index` column by one*

432390

433391```toml

434392[[actions]]

@@ -443,7 +401,7 @@ down = "index - 1" # Decrement to revert for old schema

443401 name = "index"

444402```

445403

446−_Example: make `name` column not nullable_

404+*Example: make `name` column not nullable*

447405

448406```toml

449407[[actions]]

@@ -458,7 +416,7 @@ up = "COALESCE(name, 'N/A')"

458416 nullable = false

459417```

460418

461−_Example: change default value of `created_at` column to current time_

419+*Example: change default value of `created_at` column to current time*

462420

463421```toml

464422[[actions]]

@@ -472,11 +430,11 @@ column = "created_at"

472430

473431#### Remove column

474432

475−The `remove_column` action will remove an existing column from a table. You can optionally provide a `down` setting. This should be an SQL expression which will be used to determine values for the old schema when inserting or updating rows using the new schema. `down` may also reference another table to perform cross-table migrations (see ["Complex changes across tables"](#complex-changes-across-tables)) . The `down` setting must be provided when the removed column is `NOT NULL` or doesn't have a default value.

433+The `remove_column` action will remove an existing column from a table. You can optionally provide a `down` setting. This should be an SQL expression which will be used to determine values for the old schema when inserting or updating rows using the new schema. The `down` setting must be provided when the removed column is `NOT NULL` or doesn't have a default value.

476434

477435Any indices that cover the column will be removed.

478436

479−_Example: remove column `name` from table `users`_

437+*Example: remove column `name` from table `users`*

480438

481439```toml

482440[[actions]]

@@ -488,29 +446,13 @@ column = "name"

488446down = "'N/A'"

489447```

490448

491−_Example: remove `email` column from `users` table and use column from `profiles` table instead_

492−

493−```toml

494−[[actions]]

495−type = "remove_column"

496−table = "users"

497−column = "email"

498−

499− # Our application will use the `profiles.email` column instead

500− # For backwards compatibility, we will write back to the removed `email` column whenever `profiles` is changed

501− [actions.down]

502− table = "profiles"

503− value = "profiles.email"

504− where = "users.id = profiles.user_id"

505−```

506−

507449### Indices

508450

509451#### Add index

510452

511453The `add_index` action will add a new index to an existing table.

512454

513−_Example: create a `users` table with a unique index on the `name` column_

455+*Example: create a `users` table with a unique index on the `name` column*

514456

515457```toml

516458[[actions]]

@@ -539,7 +481,7 @@ table = "users"

539481 unique = true

540482```

541483

542−_Example: add GIN index to `data` column on `products` table_

484+*Example: add GIN index to `data` column on `products` table*

543485

544486```toml

545487[[actions]]

@@ -558,7 +500,7 @@ table = "products"

558500

559501The `remove_index` action will remove an existing index. The index won't actually be removed until the migration is completed.

560502

561−_Example: remove the `name_idx` index_

503+*Example: remove the `name_idx` index*

562504

563505```toml

564506[[actions]]

@@ -572,7 +514,7 @@ index = "name_idx"

572514

573515The `create_enum` action will create a new [enum type](https://www.postgresql.org/docs/current/datatype-enum.html) with the specified values.

574516

575−_Example: add a new `mood` enum type with three possible values_

517+*Example: add a new `mood` enum type with three possible values*

576518

577519```toml

578520[[actions]]

@@ -585,7 +527,7 @@ values = ["happy", "ok", "sad"]

585527

586528The `remove_enum` action will remove an existing [enum type](https://www.postgresql.org/docs/current/datatype-enum.html). Make sure all usages of the enum has been removed before running the migration. The enum will only be removed once the migration is completed.

587529

588−_Example: remove the `mood` enum type_

530+*Example: remove the `mood` enum type*

589531

590532```toml

591533[[actions]]

@@ -603,7 +545,7 @@ There are three optional settings available which all accept SQL queries. All qu

603545- `complete`: run when a migration is completed using `reshape migration complete`

604546- `abort`: run when a migration is aborted using `reshape migration abort`

605547

606−_Example: enable PostGIS and pg_stat_statements extensions_

548+*Example: enable PostGIS and pg_stat_statements extensions*

607549

608550```toml

609551[[actions]]

@@ -620,92 +562,6 @@ abort = """

620562"""

621563```

622564

623−### Complex changes across tables

624−

625−The `up` and `down` options available when creating tables, adding columns and removing columns can also perform more complex changes that span tables.

626−

627−_Example: move `email` column from `users` to `profiles` table_

628−

629−```toml

630−[[actions]]

631−type = "add_column"

632−table = "profiles"

633−

634− [actions.column]

635− name = "email"

636− type = "TEXT"

637− nullable = false

638−

639− # When `users` is updated in the old schema, we write the email value to `profiles`

640− [actions.up]

641− table = "users"

642− value = "users.email"

643− where = "profiles.user_id = users.id"

644−

645−[[actions]]

646−type = "remove_column"

647−table = "users"

648−column = "email"

649−

650− # When `profiles` is changed in the new schema, we write the email address back to the removed column

651− [actions.down]

652− table = "profiles"

653− value = "profiles.email"

654− where = "users.id = profiles.user_id"

655−```

656−

657−_Example: turn a 1:N relationship between `users` and `accounts` into N:M and change the format of the associated `role`_

658−

659−```toml

660−# Add `user_account_connections` as a junction table

661−[[actions]]

662−type = "create_table"

663−name = "user_account_connections"

664−primary_key = ["account_id", "user_id"]

665−

666− [[actions.columns]]

667− name = "account_id"

668− type = "INTEGER"

669−

670− [[actions.columns]]

671− name = "user_id"

672− type = "INTEGER"

673−

674− # `role` is currently stored directly on the `users` table but is part of the relationship

675− [[actions.columns]]

676− name = "role"

677− type = "TEXT"

678− nullable = false

679−

680− # Backfill the new table from `users` and uppercase the `role`

681− [actions.up]

682− table = "users"

683− values = { user_id = "id", account_id = "account_id", role = "UPPER(account_role)" }

684− where = "user_account_connections.user_id = users.id"

685−

686−[[actions]]

687−type = "remove_column"

688−table = "users"

689−column = "account_id"

690−

691− # When `user_account_connections` is updated, we write the `account_id` back to `users`

692− [actions.down]

693− table = "user_account_connections"

694− value = "user_account_connections.account_id"

695− where = "users.id = user_account_connections.user_id"

696−

697−[[actions]]

698−type = "remove_column"

699−table = "users"

700−column = "account_role"

701−

702− # When `user_account_connections` is updated, we write the lowercase role back to `users`

703− [actions.down]

704− table = "user_account_connections"

705− value = "LOWER(user_account_connections.role)"

706− where = "users.id = user_account_connections.user_id"

707−```

708−

709565## Commands and options

710566

711567### `reshape migration start`

@@ -714,16 +570,16 @@ Starts a new migration, applying all migrations under `migrations/` that haven't

714570

715571#### Options

716572

717−_See also [Connection options](#connection-options)_

573+*See also [Connection options](#connection-options)*

718574

719−| Option | Default | Description |

720−| ------------------ | ------------- | --------------------------------------------------------------------------------------------------------------- |

721−| `--complete`, `-c` | `false` | Automatically complete migration after applying it. |

722−| `--dirs` | `migrations/` | Directories to search for migration files. Multiple directories can be specified using `--dirs dir1 dir2 dir3`. |

575+| Option | Default | Description |

576+| ------ | ------- | ----------- |

577+| `--complete`, `-c` | `false` | Automatically complete migration after applying it. |

578+| `--dirs` | `migrations/` | Directories to search for migration files. Multiple directories can be specified using `--dirs dir1 dir2 dir3`. |

723579

724580### `reshape migration complete`

725581

726−Completes migrations previously started with `reshape migration complete`.

582+Completes migrations previously started with `reshape migration complete`.

727583

728584#### Options

729585

@@ -731,7 +587,7 @@ See [Connection options](#connection-options)

731587

732588### `reshape migration abort`

733589

734−Aborts any migrations which haven't yet been completed.

590+Aborts any migrations which haven't yet been completed.

735591

736592#### Options

737593

@@ -747,8 +603,8 @@ The query should look something like `SET search_path TO migration_1_initial_mig

747603

748604#### Options

749605

750−| Option | Default | Description |

751−| -------- | ------------- | --------------------------------------------------------------------------------------------------------------- |

606+| Option | Default | Description |

607+| ------ | ------- | ----------- |

752608| `--dirs` | `migrations/` | Directories to search for migration files. Multiple directories can be specified using `--dirs dir1 dir2 dir3`. |

753609

754610### Connection options

@@ -757,14 +613,14 @@ The options below can be used with all commands that communicate with Postgres.

757613

758614All options can also be set using environment variables instead of flags. If a `.env` file exists, then variables will be automatically loaded from there.

759615

761−| ------------ | ----------- | -------------------- | ------------------------------------------- |

762−| `--url` | | `DB_URL` | URL to your Postgres database |

617+| ------ | ------- | -------------------- | ----------- |

618+| `--url` | | `DB_URL` | URL to your Postgres database |

768624

769625## License

770626

src/lib.rs+3−6

@@ -210,8 +210,7 @@ fn migrate(

210210 let description = action.describe();

211211 print!(" + {} ", description);

212212

213− let ctx =

214− MigrationContext::new(migration_index, action_index, state::current_migration(db)?);

213+ let ctx = MigrationContext::new(migration_index, action_index);

215214 result = action

216215 .run(&ctx, db, &new_schema)

217216 .with_context(|| format!("failed to {}", description));

@@ -321,8 +320,7 @@ fn complete(db: &mut DbConn, state: &mut State) -> anyhow::Result<()> {

321320 let description = action.describe();

322321 print!(" + {} ", description);

323322

324− let ctx =

325− MigrationContext::new(migration_index, action_index, state::current_migration(db)?);

323+ let ctx = MigrationContext::new(migration_index, action_index);

326324

327325 // Update state to indicate that this action has been completed.

328326 // We won't save this new state until after the action has completed.

@@ -447,8 +445,7 @@ fn abort(db: &mut DbConn, state: &mut State) -> anyhow::Result<()> {

447445 continue;

448446 }

449447

450− let ctx =

451− MigrationContext::new(migration_index, action_index, state::current_migration(db)?);

448+ let ctx = MigrationContext::new(migration_index, action_index);

452449 action

453450 .abort(&ctx, db)

454451 .with_context(|| format!("failed to abort migration {}", migration.name))

src/migrations/add_column.rs+58−214

@@ -3,25 +3,14 @@ use crate::{

33 db::{Conn, Transaction},

44 schema::Schema,

55};

6−use anyhow::{bail, Context};

6+use anyhow::Context;

77use serde::{Deserialize, Serialize};

99#[derive(Serialize, Deserialize, Debug)]

1010pub struct AddColumn {

1111 pub table: String,

12+ pub up: Option<String>,

1213 pub column: Column,

13− pub up: Option<Transformation>,

14−}

15−

16−#[derive(Serialize, Deserialize, Debug)]

17−#[serde(untagged)]

18−pub enum Transformation {

19− Simple(String),

20− Update {

21− table: String,

22− value: String,

23− r#where: String,

24− },

2514}

2615

2716impl AddColumn {

@@ -43,15 +32,6 @@ impl AddColumn {

4332 )

4433 }

4534

46− fn reverse_trigger_name(&self, ctx: &MigrationContext) -> String {

47− format!(

48− "{}_add_column_{}_{}_rev",

49− ctx.prefix(),

50− self.table,

51− self.column.name

52− )

53− }

54−

5535 fn not_null_constraint_name(&self, ctx: &MigrationContext) -> String {

5636 format!(

5737 "{}_add_column_not_null_{}_{}",

@@ -81,7 +61,7 @@ impl Action for AddColumn {

8161 let temp_column_name = self.temp_column_name(ctx);

8262

8363 let mut definition_parts = vec![

84− format!("\"{}\"", temp_column_name.to_string()),

64+ temp_column_name.to_string(),

8565 self.column.data_type.to_string(),

8666 ];

8767

@@ -106,189 +86,53 @@ impl Action for AddColumn {

10686 );

10787 db.run(&query).context("failed to add column")?;

10888

109− let declarations: Vec<String> = table

110− .columns

111− .iter()

112− .map(|column| {

113− format!(

114− "\"{alias}\" public.{table}.{real_name}%TYPE := NEW.{real_name};",

115− table = table.real_name,

116− alias = column.name,

117− real_name = column.real_name,

118− )

119− })

120− .collect();

121−

12289 if let Some(up) = &self.up {

123− if let Transformation::Simple(up) = up {

124− // Add triggers to fill in values as they are inserted/updated

125− let query = format!(

126− r#"

127− CREATE OR REPLACE FUNCTION {trigger_name}()

128− RETURNS TRIGGER AS $$

129− BEGIN

130− IF NOT reshape.is_new_schema() THEN

131− DECLARE

132− {declarations}

133− BEGIN

134− NEW."{temp_column_name}" = {up};

135− END;

136− END IF;

137− RETURN NEW;

138− END

139− $$ language 'plpgsql';

140−

141− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

142− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{table}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

143− "#,

144− temp_column_name = temp_column_name,

145− trigger_name = self.trigger_name(ctx),

146− up = up,

147− table = self.table,

148− declarations = declarations.join("\n"),

149− );

150− db.run(&query).context("failed to create up trigger")?;

151−

152− // Backfill values in batches

153− common::batch_touch_rows(db, &table.real_name, Some(&temp_column_name))

154− .context("failed to batch update existing rows")?;

155− }

156−

157− if let Transformation::Update {

158− table: from_table,

159− value,

160− r#where,

161− } = up

162− {

163− let existing_schema_name = match &ctx.existing_schema_name {

164− Some(name) => name,

165− None => bail!("can't use update without previous migration"),

166− };

167−

168− let from_table = schema.get_table(db, &from_table)?;

169−

170− let from_table_assignments: Vec<String> = from_table

171− .columns

172− .iter()

173− .map(|column| {

174− format!(

175− "{table}.{alias} = NEW.{real_name};",

176− table = from_table.name,

177− alias = column.name,

178− real_name = column.real_name,

179− )

180− })

181− .collect();

182−

183− // Add triggers to fill in values as they are inserted/updated

184− let query = format!(

185− r#"

186− CREATE OR REPLACE FUNCTION {trigger_name}()

187− RETURNS TRIGGER AS $$

188− #variable_conflict use_variable

189− BEGIN

190− IF NOT reshape.is_new_schema() THEN

191− DECLARE

192− {from_table} migration_{existing_schema_name}.{from_table}%ROWTYPE;

193− BEGIN

194− {assignments}

195−

196− -- Don't trigger reverse trigger when making this update

197− perform set_config('reshape.disable_triggers', 'TRUE', TRUE);

198−

199− UPDATE public."{changed_table_real}"

200− SET "{temp_column_name}" = {value}

201− WHERE {where};

202−

203− perform set_config('reshape.disable_triggers', '', TRUE);

204− END;

205− END IF;

206− RETURN NEW;

207− END

208− $$ language 'plpgsql';

209−

210− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{from_table_real}";

211− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{from_table_real}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

212− "#,

213− assignments = from_table_assignments.join("\n"),

214− changed_table_real = table.real_name,

215− from_table = from_table.name,

216− from_table_real = from_table.real_name,

217− trigger_name = self.trigger_name(ctx),

218− // declarations = from_table_declarations.join("\n"),

219− temp_column_name = temp_column_name,

220− );

221− db.run(&query).context("failed to create up trigger")?;

222−

223− let from_table_columns = from_table

224− .columns

225− .iter()

226− .map(|column| format!("{} as {}", column.real_name, column.name))

227− .collect::<Vec<String>>()

228− .join(", ");

229−

230− let changed_table_assignments: Vec<String> = table

231− .columns

232− .iter()

233− .map(|column| {

234− format!(

235− "{table}.{alias} := NEW.{real_name};",

236− table = table.name,

237− alias = column.name,

238− real_name = column.real_name,

239− )

240− })

241− .collect();

242−

243− // Add triggers to fill in values as they are inserted/updated

244− let query = format!(

245− r#"

246− CREATE OR REPLACE FUNCTION {trigger_name}()

247− RETURNS TRIGGER AS $$

248− #variable_conflict use_variable

249− BEGIN

250− IF NOT reshape.is_new_schema() AND NOT current_setting('reshape.disable_triggers', TRUE) = 'TRUE' THEN

251− DECLARE

252− {changed_table} migration_{existing_schema_name}.{changed_table}%ROWTYPE;

253− __temp_row migration_{existing_schema_name}.{from_table}%ROWTYPE;

254− BEGIN

255− {changed_table_assignments}

256−

257− SELECT {from_table_columns}

258− INTO __temp_row

259− FROM migration_{existing_schema_name}.{from_table} {from_table}

260− WHERE {where};

261−

262− DECLARE

263− {from_table} migration_{existing_schema_name}.{from_table}%ROWTYPE;

264− BEGIN

265− {from_table} = __temp_row;

266− NEW.{temp_column_name} = {value};

267− END;

268− END;

269− END IF;

270− RETURN NEW;

271− END

272− $$ language 'plpgsql';

273−

274− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{changed_table_real}";

275− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{changed_table_real}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

276− "#,

277− changed_table_assignments = changed_table_assignments.join("\n"),

278− changed_table_real = table.real_name,

279− changed_table = table.name,

280− from_table = from_table.name,

281− trigger_name = self.reverse_trigger_name(ctx),

282− temp_column_name = temp_column_name,

283− // declarations = declarations.join("\n"),

284− );

285− db.run(&query)

286− .context("failed to create reverse up trigger")?;

90+ let declarations: Vec<String> = table

91+ .columns

92+ .iter()

93+ .map(|column| {

94+ format!(

95+ "{alias} public.{table}.{real_name}%TYPE := NEW.{real_name};",

96+ table = table.real_name,

97+ alias = column.name,

98+ real_name = column.real_name,

99+ )

100+ })

101+ .collect();

102+

103+ // Add triggers to fill in values as they are inserted/updated

104+ let query = format!(

105+ r#"

106+ CREATE OR REPLACE FUNCTION {trigger_name}()

107+ RETURNS TRIGGER AS $$

108+ BEGIN

109+ IF NOT reshape.is_new_schema() THEN

110+ DECLARE

111+ {declarations}

112+ BEGIN

113+ NEW.{temp_column_name} = {up};

114+ END;

115+ END IF;

116+ RETURN NEW;

117+ END

118+ $$ language 'plpgsql';

119+

120+ DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

121+ CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{table}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

122+ "#,

123+ temp_column_name = temp_column_name,

124+ trigger_name = self.trigger_name(ctx),

125+ up = up,

126+ table = self.table,

127+ declarations = declarations.join("\n"),

128+ );

129+ db.run(&query).context("failed to create up trigger")?;

130+ }

287131

288− // Backfill values in batches by touching the from table

289− common::batch_touch_rows(db, &from_table.real_name, None)

290− .context("failed to batch update existing rows")?;

291− }

132+ // Backfill values in batches

133+ if self.up.is_some() {

134+ common::batch_touch_rows(db, &table.real_name, &temp_column_name)

135+ .context("failed to batch update existing rows")?;

292136 }

293137

294138 // Add a temporary NOT NULL constraint if the column shouldn't be nullable.

@@ -298,10 +142,10 @@ impl Action for AddColumn {

298142 if !self.column.nullable {

299143 let query = format!(

300144 r#"

301− ALTER TABLE "{table}"

302− ADD CONSTRAINT "{constraint_name}"

303− CHECK ("{column}" IS NOT NULL) NOT VALID

304− "#,

145+ ALTER TABLE "{table}"

146+ ADD CONSTRAINT "{constraint_name}"

147+ CHECK ("{column}" IS NOT NULL) NOT VALID

148+ "#,

305149 table = self.table,

306150 constraint_name = self.not_null_constraint_name(ctx),

307151 column = temp_column_name,

@@ -323,11 +167,11 @@ impl Action for AddColumn {

323167 // Remove triggers and procedures

324168 let query = format!(

325169 r#"

326− DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

327− DROP FUNCTION IF EXISTS "{reverse_trigger_name}" CASCADE;

170+ DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

171+ DROP FUNCTION IF EXISTS "{trigger_name}";

328172 "#,

173+ table = self.table,

329174 trigger_name = self.trigger_name(ctx),

330− reverse_trigger_name = self.reverse_trigger_name(ctx),

331175 );

332176 transaction

333177 .run(&query)

@@ -418,11 +262,11 @@ impl Action for AddColumn {

418262 // Remove triggers and procedures

419263 let query = format!(

420264 r#"

421− DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

422− DROP FUNCTION IF EXISTS "{reverse_trigger_name}" CASCADE;

265+ DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

266+ DROP FUNCTION IF EXISTS "{trigger_name}";

423267 "#,

268+ table = self.table,

424269 trigger_name = self.trigger_name(ctx),

425− reverse_trigger_name = self.reverse_trigger_name(ctx),

426270 );

427271 db.run(&query).context("failed to drop up trigger")?;

428272

src/migrations/alter_column.rs+1−1

@@ -150,7 +150,7 @@ impl Action for AlterColumn {

150150 .context("failed to create up and down triggers")?;

151151

152152 // Backfill values in batches by touching the previous column

153− common::batch_touch_rows(db, &table.real_name, Some(&column.real_name))

153+ common::batch_touch_rows(db, &table.real_name, &column.real_name)

154154 .context("failed to batch update existing rows")?;

155155

156156 // Duplicate any indices to the temporary column

src/migrations/common.rs+9−14

@@ -69,11 +69,7 @@ impl ToSql for PostgresRawValue {

6969 postgres::types::to_sql_checked!();

7070}

7171

72−pub fn batch_touch_rows(

73− db: &mut dyn Conn,

74− table: &str,

75− column: Option<&str>,

76−) -> anyhow::Result<()> {

72+pub fn batch_touch_rows(db: &mut dyn Conn, table: &str, column: &str) -> anyhow::Result<()> {

7773 const BATCH_SIZE: u16 = 1000;

7874

7975 let mut cursor: Option<PostgresRawValue> = None;

@@ -82,13 +78,6 @@ pub fn batch_touch_rows(

8278 let mut params: Vec<&(dyn ToSql + Sync)> = Vec::new();

8379

8480 let primary_key = get_primary_key_columns_for_table(db, table)?;

85−

86− // If no column to touch is passed, we default to the first primary key column (just to make some "update")

87− let touched_column = match column {

88− Some(column) => column,

89− None => primary_key.first().unwrap(),

90− };

91−

9281 let primary_key_columns = primary_key.join(", ");

9382

9483 let primary_key_where = primary_key

@@ -131,8 +120,8 @@ pub fn batch_touch_rows(

131120 ORDER BY {primary_key_columns}

132121 LIMIT {batch_size}

133122 ), update AS (

134− UPDATE public."{table}" "{table}"

135− SET "{touched_column}" = "{table}"."{touched_column}"

123+ UPDATE public."{table}"

124+ SET "{column}" = "{column}"

136125 FROM rows

137126 WHERE {primary_key_where}

138127 RETURNING {returning_columns}

@@ -141,7 +130,13 @@ pub fn batch_touch_rows(

141130 FROM update

142131 LIMIT 1

143132 "#,

133+ table = table,

134+ primary_key_columns = primary_key_columns,

135+ cursor_where = cursor_where,

144136 batch_size = BATCH_SIZE,

137+ column = column,

138+ primary_key_where = primary_key_where,

139+ returning_columns = returning_columns,

145140 );

146141 let last_value = db

147142 .query_with_params(&query, &params)?

src/migrations/create_table.rs+8−121

@@ -1,9 +1,6 @@

1−use std::collections::HashMap;

2−

31use super::{common::ForeignKey, Action, Column, MigrationContext};

42use crate::{

53 db::{Conn, Transaction},

6− migrations::common,

74 schema::Schema,

85};

96use anyhow::Context;

@@ -17,21 +14,6 @@ pub struct CreateTable {

1714

1815 #[serde(default)]

1916 pub foreign_keys: Vec<ForeignKey>,

20−

21− pub up: Option<Transformation>,

22−}

23−

24−#[derive(Serialize, Deserialize, Debug)]

25−pub struct Transformation {

26− table: String,

27− values: HashMap<String, String>,

28− upsert_constraint: Option<String>,

29−}

30−

31−impl CreateTable {

32− fn trigger_name(&self, ctx: &MigrationContext) -> String {

33− format!("{}_create_table_{}", ctx.prefix(), self.name)

34− }

3517}

3618

3719#[typetag::serde(name = "create_table")]

@@ -42,7 +24,7 @@ impl Action for CreateTable {

4224

4325 fn run(

4426 &self,

45− ctx: &MigrationContext,

27+ _ctx: &MigrationContext,

4628 db: &mut dyn Conn,

4729 schema: &Schema,

4830 ) -> anyhow::Result<()> {

@@ -103,7 +85,7 @@ impl Action for CreateTable {

10385 ));

10486 }

10587

106− let query = &format!(

88+ db.run(&format!(

10789 r#"

10890 CREATE TABLE "{name}" (

10991 {definition}

@@ -111,118 +93,23 @@ impl Action for CreateTable {

11193 "#,

11294 name = self.name,

11395 definition = definition_rows.join(",\n"),

114− );

115− db.run(query).context("failed to create table")?;

116−

117− if let Some(Transformation {

118− table: from_table,

119− values,

120− upsert_constraint,

121− }) = &self.up

122− {

123− let from_table = schema.get_table(db, &from_table)?;

124−

125− let declarations: Vec<String> = from_table

126− .columns

127− .iter()

128− .map(|column| {

129− format!(

130− "{alias} public.{table}.{real_name}%TYPE := NEW.{real_name};",

131− table = from_table.real_name,

132− alias = column.name,

133− real_name = column.real_name,

134− )

135− })

136− .collect();

137−

138− let (insert_columns, insert_values): (Vec<&str>, Vec<&str>) = values

139− .iter()

140− .map(|(k, v)| -> (&str, &str) { (k, v) }) // Force &String to &str

141− .unzip();

142−

143− let update_set: Vec<String> = values

144− .iter()

145− .map(|(field, value)| format!("\"{field}\" = {value}"))

146− .collect();

147−

148− // Constraint to check for conflicts. Defaults to the primary key constraint.

149− let conflict_constraint_name = match upsert_constraint {

150− Some(custom_constraint) => custom_constraint.clone(),

151− _ => format!("{table}_pkey", table = self.name),

152− };

153−

154− // Add triggers to fill in values as they are inserted/updated

155− let query = format!(

156− r#"

157− CREATE OR REPLACE FUNCTION {trigger_name}()

158− RETURNS TRIGGER AS $$

159− #variable_conflict use_variable

160− BEGIN

161− IF NOT reshape.is_new_schema() THEN

162− DECLARE

163− {declarations}

164− BEGIN

165− INSERT INTO public."{changed_table_real}" ({columns})

166− VALUES ({values})

167− ON CONFLICT ON CONSTRAINT "{conflict_constraint_name}"

168− DO UPDATE SET

169− {updates};

170− END;

171− END IF;

172− RETURN NEW;

173− END

174− $$ language 'plpgsql';

175−

176− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{from_table_real}";

177− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{from_table_real}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

178− "#,

179− changed_table_real = self.name,

180− from_table_real = from_table.real_name,

181− trigger_name = self.trigger_name(ctx),

182− declarations = declarations.join("\n"),

183− columns = insert_columns.join(", "),

184− values = insert_values.join(", "),

185− updates = update_set.join(",\n"),

186− );

187− db.run(&query).context("failed to create up trigger")?;

188−

189− // Backfill values in batches by touching the from table

190− common::batch_touch_rows(db, &from_table.real_name, None)

191− .context("failed to batch update existing rows")?;

192− }

193−

96+ ))

97+ .context("failed to create table")?;

19498 Ok(())

19599 }

196100

197101 fn complete<'a>(

198102 &self,

199− ctx: &MigrationContext,

200− db: &'a mut dyn Conn,

103+ _ctx: &MigrationContext,

104+ _db: &'a mut dyn Conn,

201105 ) -> anyhow::Result<Option<Transaction<'a>>> {

202− // Remove triggers and procedures

203− let query = format!(

204− r#"

205− DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

206− "#,

207− trigger_name = self.trigger_name(ctx),

208− );

209− db.run(&query).context("failed to drop up trigger")?;

210−

106+ // Do nothing

211107 Ok(None)

212108 }

213109

214110 fn update_schema(&self, _ctx: &MigrationContext, _schema: &mut Schema) {}

215111

216− fn abort(&self, ctx: &MigrationContext, db: &mut dyn Conn) -> anyhow::Result<()> {

217− // Remove triggers and procedures

218− let query = format!(

219− r#"

220− DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

221− "#,

222− trigger_name = self.trigger_name(ctx),

223− );

224− db.run(&query).context("failed to drop up trigger")?;

225−

112+ fn abort(&self, _ctx: &MigrationContext, db: &mut dyn Conn) -> anyhow::Result<()> {

226113 db.run(&format!(

227114 r#"

228115 DROP TABLE IF EXISTS "{name}"

src/migrations/mod.rs+1−7

@@ -88,19 +88,13 @@ impl Clone for Migration {

8888pub struct MigrationContext {

8989 migration_index: usize,

9090 action_index: usize,

91− existing_schema_name: Option<String>,

9291}

9392

9493impl MigrationContext {

95− pub fn new(

96− migration_index: usize,

97− action_index: usize,

98− existing_schema_name: Option<String>,

99− ) -> Self {

94+ pub fn new(migration_index: usize, action_index: usize) -> Self {

10095 MigrationContext {

10196 migration_index,

10297 action_index,

103− existing_schema_name,

10498 }

10599 }

106100

src/migrations/remove_column.rs+34−339

@@ -3,25 +3,14 @@ use crate::{

33 db::{Conn, Transaction},

44 schema::Schema,

55};

6−use anyhow::{anyhow, bail, Context};

6+use anyhow::Context;

77use serde::{Deserialize, Serialize};

99#[derive(Serialize, Deserialize, Debug)]

1010pub struct RemoveColumn {

1111 pub table: String,

1212 pub column: String,

13− pub down: Option<Transformation>,

14−}

15−

16−#[derive(Serialize, Deserialize, Debug)]

17−#[serde(untagged)]

18−pub enum Transformation {

19− Simple(String),

20− Update {

21− table: String,

22− value: String,

23− r#where: String,

24− },

13+ pub down: Option<String>,

2514}

2615

2716impl RemoveColumn {

@@ -33,33 +22,6 @@ impl RemoveColumn {

3322 self.column

3423 )

3524 }

36−

37− fn reverse_trigger_name(&self, ctx: &MigrationContext) -> String {

38− format!(

39− "{}_remove_column_{}_{}_rev",

40− ctx.prefix(),

41− self.table,

42− self.column

43− )

44− }

45−

46− fn not_null_constraint_trigger_name(&self, ctx: &MigrationContext) -> String {

47− format!(

48− "{}_remove_column_{}_{}_nn",

49− ctx.prefix(),

50− self.table,

51− self.column

52− )

53− }

54−

55− fn not_null_constraint_name(&self, ctx: &MigrationContext) -> String {

56− format!(

57− "{}_add_column_not_null_{}_{}",

58− ctx.prefix(),

59− self.table,

60− self.column

61− )

62− }

6325}

6426

6527#[typetag::serde(name = "remove_column")]

@@ -77,13 +39,10 @@ impl Action for RemoveColumn {

7739 db: &mut dyn Conn,

7840 schema: &Schema,

7941 ) -> anyhow::Result<()> {

80− let table = schema.get_table(db, &self.table)?;

81− let column = table

82− .get_column(&self.column)

83− .ok_or_else(|| anyhow!("no such column {} exists", self.column))?;

84−

8542 // Add down trigger

8643 if let Some(down) = &self.down {

44+ let table = schema.get_table(db, &self.table)?;

45+

8746 let declarations: Vec<String> = table

8847 .columns

8948 .iter()

@@ -97,226 +56,32 @@ impl Action for RemoveColumn {

9756 })

9857 .collect();

9958

100− if let Transformation::Simple(down) = down {

101− let query = format!(

102− r#"

103− CREATE OR REPLACE FUNCTION {trigger_name}()

104− RETURNS TRIGGER AS $$

105− BEGIN

106− IF reshape.is_new_schema() THEN

107− DECLARE

108− {declarations}

109− BEGIN

110− NEW.{column_name} = {down};

111− END;

112− END IF;

113− RETURN NEW;

114− END

115− $$ language 'plpgsql';

116−

117− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

118− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{table}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

119− "#,

120− column_name = self.column,

121− trigger_name = self.trigger_name(ctx),

122− down = down,

123− table = self.table,

124− declarations = declarations.join("\n"),

125− );

126− db.run(&query).context("failed to create down trigger")?;

127− }

128−

129− if let Transformation::Update {

130− table: from_table,

131− value,

132− r#where,

133− } = down

134− {

135− let existing_schema_name = match &ctx.existing_schema_name {

136− Some(name) => name,

137− None => bail!("can't use update without previous migration"),

138− };

139−

140− let from_table = schema.get_table(db, &from_table)?;

141−

142− let maybe_null_check = if !column.nullable {

143− // Replace NOT NULL constraint with a constraint trigger that only triggers on the old schema.

144− // We will add a null check to the down function on the new schema below as well to cover both cases.

145− // As we are using a complex down function, we must remove the NOT NULL check for the new schema.

146− // NOT NULL is not checked at the end of a transaction, but immediately upon update.

147− let query = format!(

148− r#"

149− CREATE OR REPLACE FUNCTION {trigger_name}()

150− RETURNS TRIGGER AS $$

59+ let query = format!(

60+ r#"

61+ CREATE OR REPLACE FUNCTION {trigger_name}()

62+ RETURNS TRIGGER AS $$

63+ BEGIN

64+ IF reshape.is_new_schema() THEN

65+ DECLARE

66+ {declarations}

15167 BEGIN

152− IF NOT reshape.is_new_schema() THEN

153− IF NEW.{column} IS NULL THEN

154− RAISE EXCEPTION '{column} can not be null';

155− END IF;

156− END IF;

157− RETURN NEW;

158− END

159− $$ language 'plpgsql';

160−

161− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

162−

163− CREATE CONSTRAINT TRIGGER "{trigger_name}"

164− AFTER INSERT OR UPDATE

165− ON "{table}"

166− FOR EACH ROW

167− EXECUTE PROCEDURE {trigger_name}();

168− "#,

169− table = self.table,

170− trigger_name = self.not_null_constraint_trigger_name(ctx),

171− column = self.column,

172− );

173− db.run(&query)

174− .context("failed to create null constraint trigger")?;

175−

176− db.run(&format!(

177− r#"

178− ALTER TABLE {table}

179− ALTER COLUMN {column}

180− DROP NOT NULL

181− "#,

182− table = self.table,

183− column = self.column

184− ))

185− .context("failed to remove column not null constraint")?;

186−

187− format!(

188− r#"

189− IF {value} IS NULL THEN

190− RAISE EXCEPTION '{column_name} can not be null';

191− END IF;

192− "#,

193− column_name = self.column,

194− )

195− } else {

196− "".to_string()

197− };

198−

199− let into_variables = from_table

200− .columns

201− .iter()

202− .map(|column| {

203− format!(

204− "NEW.{real_name} AS {alias}",

205− alias = column.name,

206− real_name = column.real_name,

207− )

208− })

209− .collect::<Vec<String>>()

210− .join(", ");

211−

212− let query = format!(

213− r#"

214− CREATE OR REPLACE FUNCTION {trigger_name}()

215− RETURNS TRIGGER AS $$

216− #variable_conflict use_variable

217− BEGIN

218− IF reshape.is_new_schema() THEN

219− DECLARE

220− {from_table} record;

221− BEGIN

222− SELECT {into_variables}

223− INTO {from_table};

224−

225− {maybe_null_check}

226−

227− -- Don't trigger reverse trigger when making this update

228− perform set_config('reshape.disable_triggers', 'TRUE', TRUE);

229−

230− UPDATE "migration_{existing_schema_name}"."{changed_table}" "{changed_table}"

231− SET "{column_name}" = {value}

232− WHERE {where};

233−

234− perform set_config('reshape.disable_triggers', '', TRUE);

235− END;

236− END IF;

237− RETURN NEW;

238− END

239− $$ language 'plpgsql';

240−

241− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{from_table_real}";

242− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{from_table_real}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

243− "#,

244− changed_table = self.table,

245− from_table = from_table.name,

246− from_table_real = from_table.real_name,

247− column_name = self.column,

248− trigger_name = self.trigger_name(ctx),

249− );

250− db.run(&query).context("failed to create down trigger")?;

251−

252− let changed_into_variables = table

253− .columns

254− .iter()

255− .map(|column| {

256− format!(

257− "NEW.{real_name} AS {alias}",

258− alias = column.name,

259− real_name = column.real_name,

260− )

261− })

262− .collect::<Vec<String>>()

263− .join(", ");

264−

265− let from_table_columns = from_table

266− .columns

267− .iter()

268− .map(|column| format!("{} as {}", column.real_name, column.name))

269− .collect::<Vec<String>>()

270− .join(", ");

271−

272− let query = format!(

273− r#"

274− CREATE OR REPLACE FUNCTION {trigger_name}()

275− RETURNS TRIGGER AS $$

276− #variable_conflict use_variable

277− BEGIN

278− IF reshape.is_new_schema() AND NOT current_setting('reshape.disable_triggers', TRUE) = 'TRUE' THEN

279− DECLARE

280− {changed_table} record;

281− __temp_row record;

282− BEGIN

283− SELECT {changed_into_variables}

284− INTO {changed_table};

285−

286− SELECT *

287− INTO __temp_row

288− FROM (

289− SELECT {from_table_columns}

290− FROM public.{from_table_real}

291− ) {from_table}

292− WHERE {where};

293−

294− DECLARE

295− {from_table} record;

296− BEGIN

297− {from_table} := __temp_row;

298− NEW.{column_name_real} = {value};

299− END;

300− END;

301− END IF;

302− RETURN NEW;

303− END

304− $$ language 'plpgsql';

305−

306− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{changed_table_real}";

307− CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{changed_table_real}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

308− "#,

309− changed_table = table.name,

310− changed_table_real = table.real_name,

311− from_table = from_table.name,

312− from_table_real = from_table.real_name,

313− column_name_real = column.real_name,

314− trigger_name = self.reverse_trigger_name(ctx),

315− // declarations = declarations.join("\n"),

316− );

317− db.run(&query)

318− .context("failed to create reverse down trigger")?;

319− }

68+ NEW.{column_name} = {down};

69+ END;

70+ END IF;

71+ RETURN NEW;

72+ END

73+ $$ language 'plpgsql';

74+

75+ DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

76+ CREATE TRIGGER "{trigger_name}" BEFORE UPDATE OR INSERT ON "{table}" FOR EACH ROW EXECUTE PROCEDURE {trigger_name}();

77+ "#,

78+ column_name = self.column,

79+ trigger_name = self.trigger_name(ctx),

80+ down = down,

81+ table = self.table,

82+ declarations = declarations.join("\n"),

83+ );

84+ db.run(&query).context("failed to create down trigger")?;

32085 }

32186

32287 Ok(())

@@ -346,15 +111,12 @@ impl Action for RemoveColumn {

346111 ALTER TABLE "{table}"

347112 DROP COLUMN IF EXISTS "{column}";

348113

349− DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

350− DROP FUNCTION IF EXISTS "{reverse_trigger_name}" CASCADE;

351− DROP FUNCTION IF EXISTS "{null_trigger_name}" CASCADE;

114+ DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

115+ DROP FUNCTION IF EXISTS "{trigger_name}";

352116 "#,

353117 table = self.table,

354118 column = self.column,

355119 trigger_name = self.trigger_name(ctx),

356− reverse_trigger_name = self.reverse_trigger_name(ctx),

357− null_trigger_name = self.not_null_constraint_trigger_name(ctx),

358120 );

359121 db.run(&query)

360122 .context("failed to drop column and down trigger")?;

@@ -371,81 +133,14 @@ impl Action for RemoveColumn {

371133 }

372134

373135 fn abort(&self, ctx: &MigrationContext, db: &mut dyn Conn) -> anyhow::Result<()> {

374− // We might have temporaily removed the NOT NULL check and have to reinstate it

375− let has_not_null_function = !db

376− .query_with_params(

377− "

378− SELECT routine_name

379− FROM information_schema.routines

380− WHERE routine_schema = 'public'

381− AND routine_name = $1

382− ",

383− &[&self.not_null_constraint_trigger_name(ctx)],

384− )

385− .context("failed to get any NOT NULL function")?

386− .is_empty();

387−

388− if has_not_null_function {

389− // Make column NOT NULL again without taking any long lived locks with a temporary constraint

390− let query = format!(

391− r#"

392− ALTER TABLE "{table}"

393− ADD CONSTRAINT "{constraint_name}"

394− CHECK ("{column}" IS NOT NULL) NOT VALID

395− "#,

396− table = self.table,

397− constraint_name = self.not_null_constraint_name(ctx),

398− column = self.column,

399− );

400− db.run(&query)

401− .context("failed to add NOT NULL constraint")?;

402−

403− let query = format!(

404− r#"

405− ALTER TABLE "{table}"

406− VALIDATE CONSTRAINT "{constraint_name}"

407− "#,

408− table = self.table,

409− constraint_name = self.not_null_constraint_name(ctx),

410− );

411− db.run(&query)

412− .context("failed to validate NOT NULL constraint")?;

413−

414− // This ALTER TABLE call will not require any exclusive locks as it can use the validated constraint from above

415− db.run(&format!(

416− r#"

417− ALTER TABLE {table}

418− ALTER COLUMN {column}

419− SET NOT NULL

420− "#,

421− table = self.table,

422− column = self.column

423− ))

424− .context("failed to reinstate column NOT NULL")?;

425−

426− // Drop the temporary constraint

427− let query = format!(

428− r#"

429− ALTER TABLE "{table}"

430− DROP CONSTRAINT "{constraint_name}"

431− "#,

432− table = self.table,

433− constraint_name = self.not_null_constraint_name(ctx),

434− );

435− db.run(&query)

436− .context("failed to drop NOT NULL constraint")?;

437− }

438−

439136 // Remove function and trigger

440137 db.run(&format!(

441138 r#"

442− DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

443− DROP FUNCTION IF EXISTS "{reverse_trigger_name}" CASCADE;

444− DROP FUNCTION IF EXISTS "{null_trigger_name}" CASCADE;

139+ DROP TRIGGER IF EXISTS "{trigger_name}" ON "{table}";

140+ DROP FUNCTION IF EXISTS "{trigger_name}";

445141 "#,

142+ table = self.table,

446143 trigger_name = self.trigger_name(ctx),

447− reverse_trigger_name = self.reverse_trigger_name(ctx),

448− null_trigger_name = self.not_null_constraint_trigger_name(ctx),

449144 ))

450145 .context("failed to drop down trigger")?;

451146

src/schema.rs+1−1

@@ -209,7 +209,7 @@ impl Schema {

209209 let real_columns: Vec<(String, String, bool, Option<String>)> = db

210210 .query(&format!(

211211 "

212− SELECT column_name, CASE WHEN data_type = 'USER-DEFINED' THEN udt_name ELSE data_type END, is_nullable, column_default

212+ SELECT column_name, data_type, is_nullable, column_default

213213 FROM information_schema.columns

214214 WHERE table_name = '{table}' AND table_schema = 'public'

215215 ORDER BY ordinal_position

tests/add_column.rs−99

@@ -260,102 +260,3 @@ fn add_column_with_default() {

260260

261261 test.run();

262262}

263−

264−#[test]

265−fn add_column_with_complex_up() {

266− let mut test = Test::new("Add column complex");

267−

268− test.first_migration(

269− r#"

270− name = "create_tables"

271−

272− [[actions]]

273− type = "create_table"

274− name = "users"

275− primary_key = ["id"]

276−

277− [[actions.columns]]

278− name = "id"

279− type = "INTEGER"

280−

281− [[actions.columns]]

282− name = "email"

283− type = "TEXT"

284−

285− [[actions]]

286− type = "create_table"

287− name = "profiles"

288− primary_key = ["user_id"]

289−

290− [[actions.columns]]

291− name = "user_id"

292− type = "INTEGER"

293− "#,

294− );

295−

296− test.second_migration(

297− r#"

298− name = "add_profiles_email_column"

299−

300− [[actions]]

301− type = "add_column"

302− table = "profiles"

303−

304− [actions.column]

305− name = "email"

306− type = "TEXT"

307− nullable = false

308−

309− [actions.up]

310− table = "users"

311− value = "users.email"

312− where = "profiles.user_id = users.id"

313− "#,

314− );

315−

316− test.after_first(|db| {

317− db.simple_query("INSERT INTO users (id, email) VALUES (1, 'test@example.com')")

318− .unwrap();

319− db.simple_query("INSERT INTO profiles (user_id) VALUES (1)")

320− .unwrap();

321− });

322−

323− test.intermediate(|old_db, new_db| {

324− // Ensure email was backfilled on profiles

325− let email: String = new_db

326− .query(

327− "

328− SELECT email

329− FROM profiles

330− WHERE user_id = 1

331− ",

332− &[],

333− )

334− .unwrap()

335− .first()

336− .map(|row| row.get("email"))

337− .unwrap();

338− assert_eq!("test@example.com", email);

339−

340− // Ensure email change in old schema is propagated to profiles table in new schema

341− old_db

342− .simple_query("UPDATE users SET email = 'test2@example.com' WHERE id = 1")

343− .unwrap();

344− let email: String = new_db

345− .query(

346− "

347− SELECT email

348− FROM profiles

349− WHERE user_id = 1

350− ",

351− &[],

352− )

353− .unwrap()

354− .first()

355− .map(|row| row.get("email"))

356− .unwrap();

357− assert_eq!("test2@example.com", email);

358− });

359−

360− test.run();

361−}

tests/complex.rsdeleted−379

@@ -1,379 +0,0 @@

1−mod common;

2−use common::Test;

3−

4−#[test]

5−fn move_column_between_tables() {

6− let mut test = Test::new("Move column between tables");

7−

8− test.first_migration(

9− r#"

10− name = "create_tables"

11−

12− [[actions]]

13− type = "create_table"

14− name = "users"

15− primary_key = ["id"]

16−

17− [[actions.columns]]

18− name = "id"

19− type = "INTEGER"

20−

21− [[actions.columns]]

22− name = "email"

23− type = "TEXT"

24−

25− [[actions]]

26− type = "create_table"

27− name = "profiles"

28− primary_key = ["id"]

29−

30− [[actions.columns]]

31− name = "id"

32− type = "INTEGER"

33−

34− [[actions.columns]]

35− name = "user_id"

36− type = "INTEGER"

37− nullable = false

38− "#,

39− );

40−

41− test.second_migration(

42− r#"

43− name = "move_email_column"

44−

45− [[actions]]

46− type = "add_column"

47− table = "profiles"

48−

49− [actions.column]

50− name = "email"

51− type = "TEXT"

52− nullable = false

53−

54− # When `users` is updated in the old schema, we write the email value to `profiles`

55− # When `profiles` is updated in the old schema, the equivalent `users.email` will also be updated

56− [actions.up]

57− table = "users"

58− value = "users.email"

59− where = "profiles.user_id = users.id"

60−

61− [[actions]]

62− type = "remove_column"

63− table = "users"

64− column = "email"

65−

66− # When `profiles` is changed in the new schema, we write the email address back to the removed column

67− [actions.down]

68− table = "profiles"

69− value = "profiles.email"

70− where = "users.id = profiles.user_id"

71− "#,

72− );

73−

74− test.after_first(|db| {

75− db.simple_query("INSERT INTO users (id, email) VALUES (1, 'test1@test.com')")

76− .unwrap();

77− db.simple_query("INSERT INTO users (id, email) VALUES (2, 'test2@test.com')")

78− .unwrap();

79−

80− db.simple_query("INSERT INTO profiles (id, user_id) VALUES (1, 1)")

81− .unwrap();

82− db.simple_query("INSERT INTO profiles (id, user_id) VALUES (2, 2)")

83− .unwrap();

84− });

85−

86− test.intermediate(|old_db, new_db| {

87− // Ensure emails were backfilled into profiles

88− let profiles_emails: Vec<String> = new_db

89− .query(

90− r#"

91− SELECT email

92− FROM profiles

93− ORDER BY id

94− "#,

95− &[],

96− )

97− .unwrap()

98− .iter()

99− .map(|row| row.get("email"))

100− .collect();

101− assert_eq!(vec!("test1@test.com", "test2@test.com"), profiles_emails);

102−

103− // Ensure insert in old schema updates new

104− old_db

105− .simple_query("INSERT INTO users (id, email) VALUES (3, 'test3@test.com')")

106− .unwrap();

107− old_db

108− .simple_query("INSERT INTO profiles (id, user_id) VALUES (3, 3)")

109− .unwrap();

110− let new_email: String = new_db

111− .query("SELECT email FROM profiles WHERE id = 3", &[])

112− .unwrap()

113− .first()

114− .map(|row| row.get("email"))

115− .unwrap();

116− assert_eq!("test3@test.com", new_email);

117−

118− // Ensure updates in old schema updates new

119− old_db

120− .simple_query("UPDATE users SET email = 'test3+updated@test.com' WHERE id = 3")

121− .unwrap();

122− let new_email: String = new_db

123− .query("SELECT email FROM profiles WHERE id = 3", &[])

124− .unwrap()

125− .first()

126− .map(|row| row.get("email"))

127− .unwrap();

128− assert_eq!("test3+updated@test.com", new_email);

129−

130− // Ensure insert in new schema updates old

131− new_db

132− .simple_query(

133− "INSERT INTO profiles (id, user_id, email) VALUES (4, 4, 'test4@test.com')",

134− )

135− .unwrap();

136− new_db

137− .simple_query("INSERT INTO users (id) VALUES (4)")

138− .unwrap();

139− let old_email: String = old_db

140− .query("SELECT email FROM users WHERE id = 4", &[])

141− .unwrap()

142− .first()

143− .map(|row| row.get("email"))

144− .unwrap();

145− assert_eq!("test4@test.com", old_email);

146−

147− // Ensure update in new schema updates old

148− new_db

149− .simple_query("UPDATE profiles SET email = 'test4+updated@test.com' WHERE id = 4")

150− .unwrap();

151− let old_email: String = old_db

152− .query("SELECT email FROM users WHERE id = 4", &[])

153− .unwrap()

154− .first()

155− .map(|row| row.get("email"))

156− .unwrap();

157− assert_eq!("test4+updated@test.com", old_email);

158− });

159−

160− test.run();

161−}

162−

163−#[test]

164−fn extract_relation_into_new_table() {

165− let mut test = Test::new("Extract relation into new table");

166−

167− test.first_migration(

168− r#"

169− name = "create_tables"

170−

171− [[actions]]

172− type = "create_table"

173− name = "accounts"

174− primary_key = ["id"]

175−

176− [[actions.columns]]

177− name = "id"

178− type = "INTEGER"

179−

180− [[actions]]

181− type = "create_table"

182− name = "users"

183− primary_key = ["id"]

184−

185− [[actions.columns]]

186− name = "id"

187− type = "INTEGER"

188−

189− [[actions.columns]]

190− name = "account_id"

191− type = "INTEGER"

192− nullable = false

193−

194− [[actions.columns]]

195− name = "account_role"

196− type = "TEXT"

197− nullable = false

198− "#,

199− );

200−

201− test.second_migration(

202− r#"

203− name = "add_account_user_connection"

204−

205− [[actions]]

206− type = "create_table"

207− name = "user_account_connections"

208− primary_key = ["account_id", "user_id"]

209−

210− [[actions.columns]]

211− name = "account_id"

212− type = "INTEGER"

213−

214− [[actions.columns]]

215− name = "user_id"

216− type = "INTEGER"

217−

218− [[actions.columns]]

219− name = "role"

220− type = "TEXT"

221− nullable = false

222−

223− [actions.up]

224− table = "users"

225− values = { user_id = "id", account_id = "account_id", role = "UPPER(account_role)" }

226− where = "user_account_connections.user_id = users.id"

227−

228− [[actions]]

229− type = "remove_column"

230− table = "users"

231− column = "account_id"

232−

233− [actions.down]

234− table = "user_account_connections"

235− value = "user_account_connections.account_id"

236− where = "users.id = user_account_connections.user_id"

237−

238− [[actions]]

239− type = "remove_column"

240− table = "users"

241− column = "account_role"

242−

243− [actions.down]

244− table = "user_account_connections"

245− value = "LOWER(user_account_connections.role)"

246− where = "users.id = user_account_connections.user_id"

247− "#,

248− );

249−

250− test.after_first(|db| {

251− db.simple_query("INSERT INTO accounts (id) VALUES (1)")

252− .unwrap();

253− db.simple_query("INSERT INTO users (id, account_id, account_role) VALUES (1, 1, 'admin')")

254− .unwrap();

255− });

256−

257− test.intermediate(|old_db, new_db| {

258− // Ensure connections was backfilled

259− let rows: Vec<(i32, i32, String)> = new_db

260− .query(

261− "

262− SELECT account_id, user_id, role

263− FROM user_account_connections

264− ",

265− &[],

266− )

267− .unwrap()

268− .iter()

269− .map(|row| (row.get("account_id"), row.get("user_id"), row.get("role")))

270− .collect();

271− assert_eq!(1, rows.len());

272−

273− let row = rows.first().unwrap();

274− assert_eq!(1, row.0);

275− assert_eq!(1, row.1);

276− assert_eq!("ADMIN", row.2);

277−

278− // Ensure inserted user in old schema creates a new connection

279− old_db

280− .simple_query(

281− "INSERT INTO users (id, account_id, account_role) VALUES (2, 1, 'developer')",

282− )

283− .unwrap();

284− assert!(

285− new_db

286− .query(

287− "

288− SELECT account_id, user_id, role

289− FROM user_account_connections

290− WHERE account_id = 1 AND user_id = 2 AND role = 'DEVELOPER'

291− ",

292− &[],

293− )

294− .unwrap()

295− .len()

296− == 1

297− );

298−

299− // Ensure NOT NULL constraint still applies to old schema

300− let result = old_db

301− .simple_query(

302− "INSERT INTO users (id, account_id, account_role) VALUES (2, NULL, 'developer')",

303− );

304− assert!(result.is_err());

305−

306− // Ensure updated user role in old schema updates connection in new schema

307− old_db

308− .simple_query("UPDATE users SET account_role = 'admin' WHERE id = 2")

309− .unwrap();

310− assert!(

311− new_db

312− .query(

313− "

314− SELECT account_id, user_id, role

315− FROM user_account_connections

316− WHERE account_id = 1 AND user_id = 2 AND role = 'ADMIN'

317− ",

318− &[],

319− )

320− .unwrap()

321− .len()

322− == 1

323− );

324−

325− // Ensure updated connection in new schema updates old schema user

326− new_db

327− .simple_query(

328− "UPDATE user_account_connections SET role = 'DEVELOPER' WHERE account_id = 1 AND user_id = 2",

329− )

330− .unwrap();

331− assert!(

332− old_db

333− .query(

334− "

335− SELECT id

336− FROM users

337− WHERE id = 2 AND account_id = 1 AND account_role = 'developer'

338− ",

339− &[],

340− )

341− .unwrap()

342− .len()

343− == 1

344− );

345−

346− // Ensure insert of user with connection through new schema updates user in old schema

347− new_db

348− .simple_query(

349− r#"

350− BEGIN;

351− INSERT INTO users (id) VALUES (3);

352− INSERT INTO user_account_connections (user_id, account_id, role) VALUES (3, 1, 'DEVELOPER');

353− COMMIT;

354− "#,

355− )

356− .unwrap();

357− new_db

358− .simple_query(

359− "",

360− )

361− .unwrap();

362− assert!(

363− old_db

364− .query(

365− "

366− SELECT id

367− FROM users

368− WHERE id = 3 AND account_id = 1 AND account_role = 'developer'

369− ",

370− &[],

371− )

372− .unwrap()

373− .len()

374− == 1

375− );

376− });

377−

378− test.run();

379−}

tests/remove_column.rs−86

@@ -128,90 +128,4 @@ fn remove_column_with_index() {

128128

129129 assert_eq!(0, count, "expected index to not exist");

130130 });

131−

132− test.run();

133−}

134−

135−#[test]

136−fn remove_column_with_complex_down() {

137− let mut test = Test::new("Remove column complex");

138−

139− test.first_migration(

140− r#"

141− name = "create_tables"

142−

143− [[actions]]

144− type = "create_table"

145− name = "users"

146− primary_key = ["id"]

147−

148− [[actions.columns]]

149− name = "id"

150− type = "INTEGER"

151−

152− [[actions.columns]]

153− name = "email"

154− type = "TEXT"

155−

156− [[actions]]

157− type = "create_table"

158− name = "profiles"

159− primary_key = ["user_id"]

160−

161− [[actions.columns]]

162− name = "user_id"

163− type = "INTEGER"

164−

165− [[actions.columns]]

166− name = "email"

167− type = "TEXT"

168− "#,

169− );

170−

171− test.second_migration(

172− r#"

173− name = "remove_users_email_column"

174−

175− [[actions]]

176− type = "remove_column"

177− table = "users"

178− column = "email"

179−

180− [actions.down]

181− table = "profiles"

182− value = "profiles.email"

183− where = "users.id = profiles.user_id"

184− "#,

185− );

186−

187− test.after_first(|db| {

188− db.simple_query("INSERT INTO users (id, email) VALUES (1, 'test@example.com')")

189− .unwrap();

190− db.simple_query("INSERT INTO profiles (user_id, email) VALUES (1, 'test@example.com')")

191− .unwrap();

192− });

193−

194− test.intermediate(|old_db, new_db| {

195− new_db

196− .simple_query("UPDATE profiles SET email = 'test2@example.com' WHERE user_id = 1")

197− .unwrap();

198−

199− // Ensure new email was propagated to users table in old schema

200− let email: String = old_db

201− .query(

202− "

203− SELECT email

204− FROM users

205− WHERE id = 1

206− ",

207− &[],

208− )

209− .unwrap()

210− .first()

211− .map(|row| row.get("email"))

212− .unwrap();

213− assert_eq!("test2@example.com", email);

214− });

215−

216− test.run();

217131}