You Need to Know About Ruby on Rails
Introduction
1.
ActiveRecord
1.1.
persisted? vs new_record?
1.2.
where.not
1.3.
delete vs destroy
1.4.
validates_with
1.5.
custom validators
2.
ActionController
2.1.
get a list of all the filters
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You Need to Know About Ruby on Rails
delete vs destroy
Explain
delete 不會觸發 callback，但 destroy 會觸發 callback