_scoping

# File activerecord/lib/active_record/relation.rb, line 1365
      def _scoping(scope, registry, all_queries = false)
        previous = registry.current_scope(model, true)
        registry.set_current_scope(model, scope)

        if all_queries
          previous_global = registry.global_current_scope(model, true)
          registry.set_global_current_scope(model, scope)
        end
        yield
      ensure
        registry.set_current_scope(model, previous)
        if all_queries
          registry.set_global_current_scope(model, previous_global)
        end
      end