Commit 8f2bdeb7 authored by Yorick Peterse's avatar Yorick Peterse

Merge branch 'change_migration_style_guide' into 'master'

[Migration guide] Add a note about prefering change_column_null over change_column

See merge request !11473
parents 9e34c8dc cf9d9d86
......@@ -139,6 +139,8 @@ Adding or removing a NOT NULL clause (or another constraint) can typically be
done without requiring downtime. However, this does require that any application
changes are deployed _first_. Thus, changing the constraints of a column should
happen in a post-deployment migration.
NOTE: Avoid using `change_column` as it produces inefficient query because it re-defines
the whole column type. For example, to add a NOT NULL constraint, prefer `change_column_null `
## Changing Column Types
......
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