Provides an interface for any class to have ClassMethods#before_validation and ClassMethods#after_validation callbacks.
First, include ActiveModel::Validations::Callbacks from the class you are creating:
class MyModel
include ActiveModel::Validations::Callbacks
before_validation :do_stuff_before_validation
after_validation :do_stuff_after_validation
end
Like other before_* callbacks if before_validation throws :abort then valid? will not be called.
Namespace
Included Modules
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