Class ActiveRecord::Validations::AssociatedValidator < ActiveModel::EachValidator

   # File activerecord/lib/active_record/validations/associated.rb, line 4
4:       def validate_each(record, attribute, value)
5:         if Array.wrap(value).reject {|r| r.marked_for_destruction? || r.valid?}.any?
6:           record.errors.add(attribute, :invalid, options.merge(:value => value))
7:         end
8:       end