raise_nested_attributes_record_not_found!

# File activerecord/lib/active_record/nested_attributes.rb, line 581
    def raise_nested_attributes_record_not_found!(association_name, record_id)
      model = self.class._reflect_on_association(association_name).klass.name
      raise RecordNotFound.new("Couldn't find #{model} with ID=#{record_id} for #{self.class.name} with ID=#{id}",
                               model, 'id', record_id)
    end