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Diffstat (limited to 'activerecord/lib/active_record/callbacks.rb')
| -rw-r--r-- | activerecord/lib/active_record/callbacks.rb | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb index be2621fdb6..eec531c514 100644 --- a/activerecord/lib/active_record/callbacks.rb +++ b/activerecord/lib/active_record/callbacks.rb @@ -169,6 +169,18 @@ module ActiveRecord # If a <tt>before_*</tt> callback returns +false+, all the later callbacks and the associated action are cancelled. If an <tt>after_*</tt> callback returns # +false+, all the later callbacks are cancelled. Callbacks are generally run in the order they are defined, with the exception of callbacks # defined as methods on the model, which are called last. + # + # == Transactions + # + # The entire callback chain of a +save+, <tt>save!</tt>, or +destroy+ call runs + # within a transaction. That includes <tt>after_*</tt> hooks. If everything + # goes fine a COMMIT is executed once the chain has been completed. + # + # If a <tt>before_*</tt> callback cancels the action a ROLLBACK is issued. You + # can also trigger a ROLLBACK raising an exception in any of the callbacks, + # including <tt>after_*</tt> hooks. Note, however, that in that case the client + # needs to be aware of it because an ordinary +save+ will raise such exception + # instead of quietly returning +false+. module Callbacks CALLBACKS = %w( after_find after_initialize before_save after_save before_create after_create before_update after_update before_validation |