Active Model Validation Callbacks

Provides an interface for any class to have before_validation and 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

Like other before_* callbacks if before_validation throws :abort then valid? will not be called.

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