$ command line cheat sheets
Cheat Sheet Title: [ no_spaces_alphanumeric_only ]
Cheat Sheet:Regular callbacks in ActiveRecord::Base: 1. before_validation 2. before_validation_on_create 3. after_validation 4. after_validation_on_create 5. before_save 6. before_create 7. after_create 8. after_save 9. before_destroy 10. after_destroy Usage: Define a method: class Foo < ActiveRecord::Base def before_create # your code here end end Invoke callback with a name of a method: class Foo < ActiveRecord::Base before_create :do_stuff protected def do_stuff # your code here end end Invoke callback with a block: class Foo < ActiveRecord::Base before_create do def do_stuff # your code here end end end Exceptions: 1. after_find 2. after_initialize Usage: Define a method: class Foo < ActiveRecord::Base def after_find do_stuff end end
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