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Diffstat (limited to 'guides/source/active_record_migrations.md')
| -rw-r--r-- | guides/source/active_record_migrations.md | 37 |
1 files changed, 22 insertions, 15 deletions
diff --git a/guides/source/active_record_migrations.md b/guides/source/active_record_migrations.md index 4e5902fb3d..c5ac70143d 100644 --- a/guides/source/active_record_migrations.md +++ b/guides/source/active_record_migrations.md @@ -522,20 +522,27 @@ majority of cases, where Active Record knows how to reverse the migration automatically. Currently, the `change` method supports only these migration definitions: -* `add_column` -* `add_index` -* `add_reference` -* `add_timestamps` -* `add_foreign_key` -* `create_table` -* `create_join_table` -* `drop_table` (must supply a block) -* `drop_join_table` (must supply a block) -* `remove_timestamps` -* `rename_column` -* `rename_index` -* `remove_reference` -* `rename_table` +* add_column +* add_foreign_key +* add_index +* add_reference +* add_timestamps +* change_column_default (must supply a :from and :to option) +* change_column_null +* create_join_table +* create_table +* disable_extension +* drop_join_table +* drop_table (must supply a block) +* enable_extension +* remove_column (must supply a type) +* remove_foreign_key (must supply a second table) +* remove_index +* remove_reference +* remove_timestamps +* rename_column +* rename_index +* rename_table `change_table` is also reversible, as long as the block does not call `change`, `change_default` or `remove`. @@ -652,7 +659,7 @@ can't be done. You can use Active Record's ability to rollback migrations using the `revert` method: ```ruby -require_relative '2012121212_example_migration' +require_relative '20121212123456_example_migration' class FixupExampleMigration < ActiveRecord::Migration def change |