mongodb/mongoid · error · Mongoid::Errors::UnsavedDocument

Attempted to save %{document} before the parent %{base}.

Error message

Attempted to save %{document} before the parent %{base}.

What it means

Error "Attempted to save %{document} before the parent %{base}." thrown in mongodb/mongoid.

Source

Thrown at lib/mongoid/association/proxy.rb:165

      # @example Raise the error.
      #   relation.raise_mixed
      #
      # @raise [ Errors::MixedRelations ] The error.
      def raise_mixed
        raise Errors::MixedRelations.new(_base.class, _association.klass)
      end

      # When the base is not yet saved and the user calls create or create!
      # on the association, this error will get raised.
      #
      # @example Raise the error.
      #   relation.raise_unsaved(post)
      #
      # @param [ Document ] doc The child document getting created.
      #
      # @raise [ Errors::UnsavedDocument ] The error.
      def raise_unsaved(doc)
        raise Errors::UnsavedDocument.new(_base, doc)
      end

      # Executes a callback method
      #
      # @example execute the before add callback
      #   execute_callback(:before_add)
      #
      # @param [ Symbol ] callback to be executed
      def execute_callback(callback, doc)
        _association.get_callbacks(callback).each do |c|
          if c.is_a? Proc
            c.call(_base, doc)
          else
            _base.send c, doc
          end
        end
      end

View on GitHub (pinned to 0da0e23d71)

When it happens

Trigger: Thrown at lib/mongoid/association/proxy.rb:165 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of mongodb/mongoid@0da0e23d71 (2026-08-23). Data as JSON: /api/errors/7af3786e0dc9b54c. Report an issue: GitHub.