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| author | Kasper Timm Hansen <kaspth@gmail.com> | 2015-03-25 13:53:23 +0100 |
|---|---|---|
| committer | Kasper Timm Hansen <kaspth@gmail.com> | 2015-03-25 13:53:23 +0100 |
| commit | 348377da4d623a81b570b2bf46e6ef9e5ee4e12f (patch) | |
| tree | 7d1f422ade0262b8df73756c45cb01bd4fab4ca2 | |
| parent | 30a5cd9c8b728af150e79bb06697de6f1adf2360 (diff) | |
| parent | 4b87780abc2cc1ae0169f5ca14d7632bd6dc30ec (diff) | |
| download | rails-348377da4d623a81b570b2bf46e6ef9e5ee4e12f.tar.gz rails-348377da4d623a81b570b2bf46e6ef9e5ee4e12f.tar.bz2 rails-348377da4d623a81b570b2bf46e6ef9e5ee4e12f.zip | |
Merge pull request #19496 from andreynering/docs-migrations-change
Documenting remove_column as a reversible migration method
| -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. |