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| -rw-r--r-- | guides/source/active_record_migrations.md | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/guides/source/active_record_migrations.md b/guides/source/active_record_migrations.md index a2b7b7a818..de8bbc4174 100644 --- a/guides/source/active_record_migrations.md +++ b/guides/source/active_record_migrations.md @@ -539,6 +539,14 @@ definitions: `change_table` is also reversible, as long as the block does not call `change`, `change_default` or `remove`. +`remove_column` is reversible if you supply the column type as the third +argument. Provide the original column options too, otherwise Rails can't +recreate the column exactly when rolling back: + +```ruby +remove_column :posts, :slug, :string, null: false, default: '', index: true +``` + If you're going to need to use any other methods, you should use `reversible` or write the `up` and `down` methods instead of using the `change` method. |