model_class=

# File activerecord/lib/active_record/fixtures.rb, line 750
      def model_class=(class_name)
        if class_name.is_a?(Class) # TODO: Should be an AR::Base type class, or any?
          @model_class = class_name
        else
          @model_class = class_name.safe_constantize if class_name
        end
      end