Method only

mongoengine/queryset/base.py:1038–1054

Load only a subset of this document's fields. :: post = BlogPost.objects(...).only('title', 'author.name') .. note :: `only()` is chainable and will perform a union :: So with the following it will fetch both: `title` and `author.name`:: post = Blog

(self, *fields)

        return distinct

    def only(self, *fields):
        """Load only a subset of this document's fields. ::

            post = BlogPost.objects(...).only('title', 'author.name')

        .. note :: `only()` is chainable and will perform a union ::
            So with the following it will fetch both: `title` and `author.name`::

                post = BlogPost.objects.only('title').only('author.name')

        :func:`~mongoengine.queryset.QuerySet.all_fields` will reset any
        field filters.

        :param fields: fields to include
        """
        fields = {f: QueryFieldList.ONLY for f in fields}
        return self.fields(True, **fields)

    def exclude(self, *fields):
        """Opposite to .only(), exclude some document's fields. ::