build_default_scope

# File activerecord/lib/active_record/scoping/default.rb, line 97
        def build_default_scope(base_rel = relation) # :nodoc:
          return if abstract_class?
          if !Base.is_a?(method(:default_scope).owner)
            # The user has defined their own default scope method, so call that
            evaluate_default_scope { default_scope }
          elsif default_scopes.any?
            evaluate_default_scope do
              default_scopes.inject(base_rel) do |default_scope, scope|
                default_scope.merge(base_rel.scoping { scope.call })
              end
            end
          end
        end