diff options
Diffstat (limited to 'generator_templates/active_record/migration/migration.rb')
| -rw-r--r-- | generator_templates/active_record/migration/migration.rb | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/generator_templates/active_record/migration/migration.rb b/generator_templates/active_record/migration/migration.rb index 825bc8bdf61..08752b3af50 100644 --- a/generator_templates/active_record/migration/migration.rb +++ b/generator_templates/active_record/migration/migration.rb @@ -12,12 +12,14 @@ class <%= migration_class_name %> < ActiveRecord::Migration # migration requires downtime. # DOWNTIME_REASON = '' - # When using the methods "add_concurrent_index" or "add_column_with_default" - # you must disable the use of transactions as these methods can not run in an - # existing transaction. When using "add_concurrent_index" make sure that this - # method is the _only_ method called in the migration, any other changes - # should go in a separate migration. This ensures that upon failure _only_ the - # index creation fails and can be retried or reverted easily. + # When using the methods "add_concurrent_index", "remove_concurrent_index" or + # "add_column_with_default" you must disable the use of transactions + # as these methods can not run in an existing transaction. + # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure + # that either of them is the _only_ method called in the migration, + # any other changes should go in a separate migration. + # This ensures that upon failure _only_ the index creation or removing fails + # and can be retried or reverted easily. # # To disable transactions uncomment the following line and remove these # comments: |