ActiveRecord Observers - RORLab Season 3-6

Transcript

1. Active Record Observers Ror lab. season 3 - the 6th round - May 11, 2013 ChangHoon Jeong(@seapy)
2. Contents • The Object Life Cycle • Validations Overview • Validation Helpers • Common Validation Options • Conditional Validation • Custom Validations • Working with Validation Errors • Displaying Validation Errors in the View • Callbacks Overview • Available Callbacks • Running Callbacks • Skipping Callbacks • Halting Execution • Relational Callbacks • Conditional Callbacks • Callback Classes • Observers • Transaction Callbacks Validations Callbacks
3. Callback Classes • To reuse callback methods for other models as an instance method a model object instance method
4. Callback Classes as a class method
5. Observers • Similar to callbacks • for the callbacks with the code that isn’t directly related the model • without changing the code of the model • ex. sending confirmation email after user registration
6. Creating Observers
7. Registering Observers • config/application.rb • or config/environments
8. Sharing Observers as a model name
9. Transaction Callbacks • after_commit or after_rollback
10. 감사합니다.