instantiate_fixtures

# File activerecord/lib/active_record/fixtures.rb, line 983
      def instantiate_fixtures
        if pre_loaded_fixtures
          raise RuntimeError, 'Load fixtures before instantiating them.' if ActiveRecord::FixtureSet.all_loaded_fixtures.empty?
          ActiveRecord::FixtureSet.instantiate_all_loaded_fixtures(self, load_instances?)
        else
          raise RuntimeError, 'Load fixtures before instantiating them.' if @loaded_fixtures.nil?
          @loaded_fixtures.each_value do |fixture_set|
            ActiveRecord::FixtureSet.instantiate_fixtures(self, fixture_set, load_instances?)
          end
        end
      end