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Diffstat (limited to 'guides/source/active_record_callbacks.md')
| -rw-r--r-- | guides/source/active_record_callbacks.md | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md index c45f3f2e6a..971c1cdb25 100644 --- a/guides/source/active_record_callbacks.md +++ b/guides/source/active_record_callbacks.md @@ -4,11 +4,11 @@ Active Record Callbacks This guide teaches you how to hook into the life cycle of your Active Record objects. -After reading this guide and trying out the presented concepts, we hope that you'll be able to: +After reading this guide, you will know: -* Understand the life cycle of Active Record objects -* Create callback methods that respond to events in the object life cycle -* Create special classes that encapsulate common behavior for your callbacks +* The life cycle of Active Record objects. +* How to create callback methods that respond to events in the object life cycle. +* How to create special classes that encapsulate common behavior for your callbacks. -------------------------------------------------------------------------------- @@ -200,7 +200,7 @@ Halting Execution As you start registering new callbacks for your models, they will be queued for execution. This queue will include all your model's validations, the registered callbacks, and the database operation to be executed. -The whole callback chain is wrapped in a transaction. If any <em>before</em> callback method returns exactly `false` or raises an exception, the execution chain gets halted and a ROLLBACK is issued; <em>after</em> callbacks can only accomplish that by raising an exception. +The whole callback chain is wrapped in a transaction. If any _before_ callback method returns exactly `false` or raises an exception, the execution chain gets halted and a ROLLBACK is issued; _after_ callbacks can only accomplish that by raising an exception. WARNING. Raising an arbitrary exception may break code that expects `save` and its friends not to fail like that. The `ActiveRecord::Rollback` exception is thought precisely to tell Active Record a rollback is going on. That one is internally captured but not reraised. |