method
attribute_will_change!
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Class: ActiveModel::Dirty
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attribute_will_change!(attr_name)
private
Dispatch target for *_will_change! attribute methods.
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THAiSi -
January 26, 2011 - (>= v3.0.0)
2 thanks
Use this for validatating nested forms
When you create a nested form, and want the main object to validate all nested models, you should make all the nested models dirty or validations will not run upon them.
class Order < ActiveRecord::Base has_many :order_lines accepts_nested_attributes_for :order_lines before_validation :mark_order_lines_as_changed private def mark_order_lines_as_changed order_lines.each(&:updated_at_will_change!) end end