through_scope

# File activerecord/lib/active_record/associations/preloader/through_association.rb, line 57
          def through_scope
            scope = through_reflection.klass.unscoped
            options = reflection.options

            if options[:source_type]
              scope.where! reflection.foreign_type => options[:source_type]
            elsif !reflection_scope.where_clause.empty?
              scope.where_clause = reflection_scope.where_clause
              values = reflection_scope.values

              if includes = values[:includes]
                scope.includes!(source_reflection.name => includes)
              else
                scope.includes!(source_reflection.name)
              end

              if values[:references] && !values[:references].empty?
                scope.references!(values[:references])
              else
                scope.references!(source_reflection.table_name)
              end

              if joins = values[:joins]
                scope.joins!(source_reflection.name => joins)
              end

              if left_outer_joins = values[:left_outer_joins]
                scope.left_outer_joins!(source_reflection.name => left_outer_joins)
              end

              if scope.eager_loading? && order_values = values[:order]
                scope = scope.order(order_values)
              end
            end

            scope unless scope.empty_scope?
          end