4e5cc5c...main · reshape

git.iko.soy/reshape

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.github/workflows/lint.yaml+3−3

since splitsnapshots

unifiedsplit

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

15 runs-on: ubuntu-latest

16 steps:

17 - name: Checkout

18− uses: actions/checkout@v2

18+ uses: actions/checkout@v4

19 - name: Select Rust toolchain with Clippy

20 uses: actions-rs/toolchain@v1

21 with:

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

23 components: clippy

24 override: true

25 - name: Use cache for Rust dependencies

26− uses: Swatinem/rust-cache@v1

26+ uses: Swatinem/rust-cache@v2

27 - name: Lint using Clippy

28− run: cargo clippy

28+ run: cargo clippy

.github/workflows/publish-crate.yamlnew file+20

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

1+name: Publish crate

3+on: workflow_dispatch

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.yamlnew file+25

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

1+name: Publish Docker image

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 @@

1[package]

2name = "reshape"

3−version = "0.6.1"

3+version = "0.7.0"

4description = "An easy-to-use, zero-downtime schema migration tool for Postgres"

5homepage = "https://github.com/fabianlindfors/reshape"

6documentation = "https://github.com/fabianlindfors/reshape"

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

9keywords = ["postgres", "migrations"]

10edition = "2021"

11authors = ["Fabian Lindfors"]

12−rust-version = "1.58"

12+rust-version = "1.70"

14[dependencies]

15postgres = { version = "0.19.2", features = ["with-serde_json-1"] }

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

23colored = "2"

24rand = "0.8"

25dotenv = "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:1.58.0 AS builder

1+FROM rust:1.70.0 AS builder

2WORKDIR /usr/src/reshape

3COPY . .

4RUN cargo build --release

README.md+116−6

@@ -2,7 +2,7 @@

3[![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

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)!

7Reshape 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/).

@@ -34,6 +34,7 @@ Designed for Postgres 12 and later.

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

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

36 - [Custom](#custom)

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

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

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

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

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

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

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

@@ -166,7 +167,7 @@ Every action has a `type`. The supported types are detailed below.

166

167

167#### Create table

168#### Create table

168

169

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

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

171

171_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_

172

173

@@ -225,6 +226,29 @@ primary_key = ["id"]

225 referenced_columns = ["id"]

226 referenced_columns = ["id"]

226```

227```

227

228

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+

228#### Rename table

252#### Rename table

229

253

230The `rename_table` action will change the name of an existing table.

254The `rename_table` action will change the name of an existing table.

@@ -284,7 +308,7 @@ foreign_key = "items_user_id_fkey"

284

308

285#### Add column

309#### Add column

286

310

287−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.

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

312

289_Example: add a new column `reference` to table `products`_

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

290

314

@@ -448,7 +472,7 @@ column = "created_at"

448

472

449#### Remove column

473#### Remove column

450

474

451−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.

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.

452

476

453Any indices that cover the column will be removed.

477Any indices that cover the column will be removed.

454

478

@@ -476,8 +500,8 @@ column = "email"

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

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

477 [actions.down]

501 [actions.down]

478 table = "profiles"

502 table = "profiles"

479− value = "email"

503+ value = "profiles.email"

480− where = "id = user_id"

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

481```

505```

482

506

483### Indices

507### Indices

@@ -596,6 +620,92 @@ abort = """

596"""

620"""

597```

621```

598

622

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+

599## Commands and options

709## Commands and options

600

710

601### `reshape migration start`

711### `reshape migration start`

src/migrations/add_column.rs+117−25

@@ -3,7 +3,7 @@ use crate::{

3 db::{Conn, Transaction},

4 schema::Schema,

5};

6−use anyhow::Context;

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

7use serde::{Deserialize, Serialize};

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

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

43 )

44 }

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+

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

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

47 format!(

56 format!(

48 "{}_add_column_not_null_{}_{}",

57 "{}_add_column_not_null_{}_{}",

@@ -72,7 +81,7 @@ impl Action for AddColumn {

72 let temp_column_name = self.temp_column_name(ctx);

81 let temp_column_name = self.temp_column_name(ctx);

74 let mut definition_parts = vec![

83 let mut definition_parts = vec![

75− temp_column_name.to_string(),

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

76 self.column.data_type.to_string(),

85 self.column.data_type.to_string(),

77 ];

86 ];

@@ -97,21 +106,21 @@ impl Action for AddColumn {

97 );

106 );

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

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

108

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+

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

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

101 if let Transformation::Simple(up) = up {

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

102− let declarations: Vec<String> = table

103− .columns

104− .iter()

105− .map(|column| {

106− format!(

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

108− table = table.real_name,

109− alias = column.name,

110− real_name = column.real_name,

111− )

112− })

113− .collect();

114−

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

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

116 let query = format!(

125 let query = format!(

117 r#"

126 r#"

@@ -122,7 +131,7 @@ impl Action for AddColumn {

122 DECLARE

131 DECLARE

123 {declarations}

132 {declarations}

124 BEGIN

133 BEGIN

125− NEW.{temp_column_name} = {up};

134+ NEW."{temp_column_name}" = {up};

126 END;

135 END;

127 END IF;

136 END IF;

128 RETURN NEW;

137 RETURN NEW;

@@ -151,15 +160,20 @@ impl Action for AddColumn {

151 r#where,

160 r#where,

152 } = up

161 } = up

153 {

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+

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

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

155

169

156− let declarations: Vec<String> = from_table

170+ let from_table_assignments: Vec<String> = from_table

157 .columns

171 .columns

158 .iter()

172 .iter()

159 .map(|column| {

173 .map(|column| {

160 format!(

174 format!(

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

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

162− table = from_table.real_name,

176+ table = from_table.name,

163 alias = column.name,

177 alias = column.name,

164 real_name = column.real_name,

178 real_name = column.real_name,

165 )

179 )

@@ -175,11 +189,18 @@ impl Action for AddColumn {

175 BEGIN

189 BEGIN

176 IF NOT reshape.is_new_schema() THEN

190 IF NOT reshape.is_new_schema() THEN

177 DECLARE

191 DECLARE

178− {declarations}

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

179 BEGIN

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+

180 UPDATE public."{changed_table_real}"

199 UPDATE public."{changed_table_real}"

181 SET "{temp_column_name}" = {value}

200 SET "{temp_column_name}" = {value}

182 WHERE {where};

201 WHERE {where};

202+

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

183 END;

204 END;

184 END IF;

205 END IF;

185 RETURN NEW;

206 RETURN NEW;

@@ -189,14 +210,81 @@ impl Action for AddColumn {

189 DROP TRIGGER IF EXISTS "{trigger_name}" ON "{from_table_real}";

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

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

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

191 "#,

212 "#,

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

192 changed_table_real = table.real_name,

214 changed_table_real = table.real_name,

215+ from_table = from_table.name,

193 from_table_real = from_table.real_name,

216 from_table_real = from_table.real_name,

194 trigger_name = self.trigger_name(ctx),

217 trigger_name = self.trigger_name(ctx),

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

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

196 temp_column_name = temp_column_name,

219 temp_column_name = temp_column_name,

197 );

220 );

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

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

199

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")?;

287+

200 // Backfill values in batches by touching the from table

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

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

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

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

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

@@ -210,10 +298,10 @@ impl Action for AddColumn {

210 if !self.column.nullable {

298 if !self.column.nullable {

211 let query = format!(

299 let query = format!(

212 r#"

300 r#"

213− ALTER TABLE "{table}"

301+ ALTER TABLE "{table}"

214− ADD CONSTRAINT "{constraint_name}"

302+ ADD CONSTRAINT "{constraint_name}"

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

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

216− "#,

304+ "#,

217 table = self.table,

305 table = self.table,

218 constraint_name = self.not_null_constraint_name(ctx),

306 constraint_name = self.not_null_constraint_name(ctx),

219 column = temp_column_name,

307 column = temp_column_name,

@@ -236,8 +324,10 @@ impl Action for AddColumn {

236 let query = format!(

324 let query = format!(

237 r#"

325 r#"

238 DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

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

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

239 "#,

328 "#,

240 trigger_name = self.trigger_name(ctx),

329 trigger_name = self.trigger_name(ctx),

330+ reverse_trigger_name = self.reverse_trigger_name(ctx),

241 );

331 );

242 transaction

332 transaction

243 .run(&query)

333 .run(&query)

@@ -329,8 +419,10 @@ impl Action for AddColumn {

329 let query = format!(

419 let query = format!(

330 r#"

420 r#"

331 DROP FUNCTION IF EXISTS "{trigger_name}" CASCADE;

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

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

332 "#,

423 "#,

333 trigger_name = self.trigger_name(ctx),

424 trigger_name = self.trigger_name(ctx),

425+ reverse_trigger_name = self.reverse_trigger_name(ctx),

334 );

426 );

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

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

336

428

src/migrations/create_table.rs+121−8

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

1+use std::collections::HashMap;

1use super::{common::ForeignKey, Action, Column, MigrationContext};

3use super::{common::ForeignKey, Action, Column, MigrationContext};

2use crate::{

4use crate::{

3 db::{Conn, Transaction},

5 db::{Conn, Transaction},

6+ migrations::common,

4 schema::Schema,

7 schema::Schema,

5};

8};

6use anyhow::Context;

9use anyhow::Context;

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

15 #[serde(default)]

18 #[serde(default)]

16 pub foreign_keys: Vec<ForeignKey>,

19 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+ }

17}

35}

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

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

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

25 fn run(

43 fn run(

26 &self,

44 &self,

27− _ctx: &MigrationContext,

45+ ctx: &MigrationContext,

28 db: &mut dyn Conn,

46 db: &mut dyn Conn,

29 schema: &Schema,

47 schema: &Schema,

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

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

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

85 ));

103 ));

86 }

104 }

105

88− db.run(&format!(

106+ let query = &format!(

89 r#"

107 r#"

90 CREATE TABLE "{name}" (

108 CREATE TABLE "{name}" (

91 {definition}

109 {definition}

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

93 "#,

111 "#,

94 name = self.name,

112 name = self.name,

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

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

96− ))

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+ );

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

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+

98 Ok(())

194 Ok(())

99 }

195 }

100

196

101 fn complete<'a>(

197 fn complete<'a>(

102 &self,

198 &self,

103− _ctx: &MigrationContext,

199+ ctx: &MigrationContext,

104− _db: &'a mut dyn Conn,

200+ db: &'a mut dyn Conn,

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

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

106− // Do nothing

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+

107 Ok(None)

211 Ok(None)

108 }

212 }

109

213

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

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

111

215

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

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+

113 db.run(&format!(

226 db.run(&format!(

114 r#"

227 r#"

115 DROP TABLE IF EXISTS "{name}"

228 DROP TABLE IF EXISTS "{name}"

src/migrations/remove_column.rs+247−27

@@ -3,7 +3,7 @@ use crate::{

3 db::{Conn, Transaction},

4 schema::Schema,

5};

6−use anyhow::{bail, Context};

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

7use serde::{Deserialize, Serialize};

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

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

33 self.column

34 )

35 }

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+ }

36}

63}

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

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

@@ -51,6 +78,9 @@ impl Action for RemoveColumn {

51 schema: &Schema,

78 schema: &Schema,

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

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

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

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))?;

55 // Add down trigger

85 // Add down trigger

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

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

@@ -109,18 +139,75 @@ impl Action for RemoveColumn {

109

139

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

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

111

141

112− let declarations: Vec<String> = from_table

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 $$

151+ 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

113 .columns

200 .columns

114 .iter()

201 .iter()

115 .map(|column| {

202 .map(|column| {

116 format!(

203 format!(

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

204+ "NEW.{real_name} AS {alias}",

118− table = from_table.real_name,

119 alias = column.name,

205 alias = column.name,

120 real_name = column.real_name,

206 real_name = column.real_name,

121 )

207 )

122 })

208 })

123− .collect();

209+ .collect::<Vec<String>>()

210+ .join(", ");

124

211

125 let query = format!(

212 let query = format!(

126 r#"

213 r#"

@@ -130,11 +217,21 @@ impl Action for RemoveColumn {

130 BEGIN

217 BEGIN

131 IF reshape.is_new_schema() THEN

218 IF reshape.is_new_schema() THEN

132 DECLARE

219 DECLARE

133− {declarations}

220+ {from_table} record;

134 BEGIN

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+

135 UPDATE "migration_{existing_schema_name}"."{changed_table}" "{changed_table}"

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

136 SET "{column_name}" = {value}

231 SET "{column_name}" = {value}

137 WHERE {where};

232 WHERE {where};

233+

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

138 END;

235 END;

139 END IF;

236 END IF;

140 RETURN NEW;

237 RETURN NEW;

@@ -145,12 +242,80 @@ impl Action for RemoveColumn {

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

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

146 "#,

243 "#,

147 changed_table = self.table,

244 changed_table = self.table,

245+ from_table = from_table.name,

148 from_table_real = from_table.real_name,

246 from_table_real = from_table.real_name,

149 column_name = self.column,

247 column_name = self.column,

150 trigger_name = self.trigger_name(ctx),

248 trigger_name = self.trigger_name(ctx),

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

152 );

249 );

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

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")?;

154 }

319 }

155 }

320 }

156

321

@@ -176,25 +341,20 @@ impl Action for RemoveColumn {

176 }

341 }

177

342

178 // Remove column, function and trigger

343 // Remove column, function and trigger

179− let trigger_table = match &self.down {

180− Some(Transformation::Update {

181− table,

182− value: _,

183− r#where: _,

184− }) => table,

185− _ => &self.table,

186− };

187 let query = format!(

344 let query = format!(

188 r#"

345 r#"

189 ALTER TABLE "{table}"

346 ALTER TABLE "{table}"

190 DROP COLUMN IF EXISTS "{column}";

347 DROP COLUMN IF EXISTS "{column}";

191

348

192− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{trigger_table}";

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

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

193− DROP FUNCTION IF EXISTS "{trigger_name}";

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

194 "#,

352 "#,

195 table = self.table,

353 table = self.table,

196 column = self.column,

354 column = self.column,

197 trigger_name = self.trigger_name(ctx),

355 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),

198 );

358 );

199 db.run(&query)

359 db.run(&query)

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

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

@@ -211,21 +371,81 @@ impl Action for RemoveColumn {

211 }

371 }

212

372

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

373 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+

214 // Remove function and trigger

439 // Remove function and trigger

215− let trigger_table = match &self.down {

216− Some(Transformation::Update {

217− table,

218− value: _,

219− r#where: _,

220− }) => table,

221− _ => &self.table,

222− };

223 db.run(&format!(

440 db.run(&format!(

224 r#"

441 r#"

225− DROP TRIGGER IF EXISTS "{trigger_name}" ON "{trigger_table}";

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

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

226− DROP FUNCTION IF EXISTS "{trigger_name}";

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

227 "#,

445 "#,

228 trigger_name = self.trigger_name(ctx),

446 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),

229 ))

449 ))

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

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

231

451

tests/add_column.rs+2−2

@@ -308,8 +308,8 @@ fn add_column_with_complex_up() {

308

309 [actions.up]

310 table = "users"

311− value = "email"

311+ value = "users.email"

312− where = "user_id = id"

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

313 "#,

314 );

315

tests/complex.rsnew file+379

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

1+mod common;

2+use common::Test;

4+#[test]

5+fn move_column_between_tables() {

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

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+2−2

@@ -179,8 +179,8 @@ fn remove_column_with_complex_down() {

179

180 [actions.down]

181 table = "profiles"

182− value = "email"

182+ value = "profiles.email"

183− where = "id = user_id"

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

184 "#,

185 );

186