class_handler.rb

module ActiveRecord
  class PredicateBuilder
    class ClassHandler # :nodoc:
      def initialize(predicate_builder)
        @predicate_builder = predicate_builder
      end

      def call(attribute, value)
        print_deprecation_warning
        predicate_builder.build(attribute, value.name)
      end

      protected

        attr_reader :predicate_builder

      private

        def print_deprecation_warning
          ActiveSupport::Deprecation.warn(<<-MSG.squish)
            Passing a class as a value in an Active Record query is deprecated and
            will be removed. Pass a string instead.
          MSG
        end
    end
  end
end