Posted over 4 years ago. Visible to the public. Repeats.

Cancel the ActiveRecord callback chain

What Rails version Within before_* Within after_*
Cancel later callbacks Rails 1-4 return false return false
Cancel later callbacks Rails 5 throw :abort throw :abort
Rollback the transaction Rails 1-4 return false raise ActiveRecord::Rollback
Rollback the transaction Rails 5 throw :abort raise ActiveRecord::Rollback

Take care that your callbacks don't accidentally return false, since that cancels the chain in Rails 1-4. Since in Ruby the last expression of a method becomes its return value automatically, this can happen accidentally:

before_save :callback def callback call_to_method_that_happens_to_return_false end

If uncertain, return true explicitely:

before_save :callback def callback call_to_method_that_happens_to_return_false true end

When a callback raises an error

Exceptions raised in callbacks always rollback the transaction, but only exceptions that are not ActiveRecord::Rollback will bubble up to the caller.

Further reading

By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.

Owner of this card:

Henning Koch
Last edit:
almost 2 years ago
by Henning Koch
before_validation, after_validation, before_save, after_save, before_update, after_update, before_create, after_create
About this deck:
We are makandra and do test-driven, agile Ruby on Rails software development.
License for source code
Posted by Henning Koch to makandra dev
This website uses cookies to improve usability and analyze traffic.
Accept or learn more