ri > ActiveModel::Validations::Callbacks

= ActiveModel::Validations::Callbacks

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= Includes:
ActiveSupport::Callbacks (from /home/chedong/.local/share/rdoc)

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= Extended by:
ActiveSupport::Concern (from /home/chedong/.local/share/rdoc)

(from /home/chedong/.local/share/rdoc)
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== 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
  end

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