# File lib/active_record/associations.rb, line 993
      def belongs_to(association_id, options = {})
        reflection = create_belongs_to_reflection(association_id, options)

        if reflection.options[:polymorphic]
          association_accessor_methods(reflection, BelongsToPolymorphicAssociation)
        else
          association_accessor_methods(reflection, BelongsToAssociation)
          association_constructor_method(:build,  reflection, BelongsToAssociation)
          association_constructor_method(:create, reflection, BelongsToAssociation)
        end

        # Create the callbacks to update counter cache
        if options[:counter_cache]
          cache_column = reflection.counter_cache_column

          method_name = "belongs_to_counter_cache_after_create_for_#{reflection.name}".to_sym
          define_method(method_name) do
            association = send(reflection.name)
            association.class.increment_counter(cache_column, send(reflection.primary_key_name)) unless association.nil?
          end
          after_create method_name

          method_name = "belongs_to_counter_cache_before_destroy_for_#{reflection.name}".to_sym
          define_method(method_name) do
            association = send(reflection.name)
            association.class.decrement_counter(cache_column, send(reflection.primary_key_name)) unless association.nil?
          end
          before_destroy method_name

          module_eval(
            "#{reflection.class_name}.send(:attr_readonly,\"#{cache_column}\".intern) if defined?(#{reflection.class_name}) && #{reflection.class_name}.respond_to?(:attr_readonly)"
          )
        end

        configure_dependency_for_belongs_to(reflection)
      end