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1da1d9bfec
Implement the operation to make an existing column `NOT NULL`.
The migration looks like this:
```json
{
"name": "16_set_not_null",
"operations": [
{
"set_not_null": {
"table": "reviews",
"column": "review",
"up": "product || ' is good'"
}
}
]
}
```
This migration adds a `NOT NULL` constraint to the `review` column in
the `reviews` table.
* On `Start`:
* Create a new column with a `NOT VALID` `NOT NULL` constraint
* Backfill the new column with values from the existing column using the
`up` SQL to replace `NULL` values
* Create a trigger to populate the new column when values are written to
the old column, rewriting `NULLs` with `up` SQL.
* Create a trigger to populate the old column when values are written to
the new column.
* On `Complete`
* Validate the `NOT VALID` `NOT NULL` constraint on the new column.
* Add `NOT NULL` to the new column.
* Remove triggers and the `NOT VALID` `NOT NULL` constraint
* Drop the old column
* Rename the new column to the old column name.
* On `Rollback`
* Remove the new column and both triggers.
31 lines
544 B
JSON
31 lines
544 B
JSON
{
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"name": "14_add_reviews_table",
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"operations": [
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{
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"create_table": {
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"name": "reviews",
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"columns": [
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{
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"name": "id",
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"type": "serial",
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"pk": true
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},
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{
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"name": "username",
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"type": "text"
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},
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{
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"name": "product",
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"type": "text"
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},
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{
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"name": "review",
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"type": "text",
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"nullable": true
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}
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]
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}
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}
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]
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}
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