# File lib/active_record/base.rb, line 1154
        def with_scope(scope = {}, action = :merge, &block)
          # If another Active Record class has been passed in, get its current scope
          scope = scope.current_scope if !scope.is_a?(Relation) && scope.respond_to?(:current_scope)

          previous_scope = self.current_scope

          if scope.is_a?(Hash)
            # Dup first and second level of hash (method and params).
            scope = scope.dup
            scope.each do |method, params|
              scope[method] = params.dup unless params == true
            end

            scope.assert_valid_keys([ :find, :create ])
            relation = construct_finder_arel(scope[:find] || {})
            relation.default_scoped = true unless action == :overwrite

            if previous_scope && previous_scope.create_with_value && scope[:create]
              scope_for_create = if action == :merge
                previous_scope.create_with_value.merge(scope[:create])
              else
                scope[:create]
              end

              relation = relation.create_with(scope_for_create)
            else
              scope_for_create = scope[:create]
              scope_for_create ||= previous_scope.create_with_value if previous_scope
              relation = relation.create_with(scope_for_create) if scope_for_create
            end

            scope = relation
          end

          scope = previous_scope.merge(scope) if previous_scope && action == :merge

          self.current_scope = scope
          begin
            yield
          ensure
            self.current_scope = previous_scope
          end
        end