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
• CommonValidation
Options
• ConditionalValidation
• CustomValidations
• Working withValidation
Errors
• DisplayingValidation Errors
in theView
• 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.