method
add_association_callbacks
add_association_callbacks(association_name, options)
private
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# File activerecord/lib/active_record/associations.rb, line 1387 def add_association_callbacks(association_name, options) callbacks = %w(before_add after_add before_remove after_remove) callbacks.each do |callback_name| full_callback_name = "#{callback_name}_for_#{association_name}" defined_callbacks = options[callback_name.to_sym] if options.has_key?(callback_name.to_sym) class_inheritable_reader full_callback_name.to_sym write_inheritable_attribute(full_callback_name.to_sym, [defined_callbacks].flatten) else write_inheritable_attribute(full_callback_name.to_sym, []) end end end