Reverted "Fixed #26398 -- Made FieldFile.open() respect its mode argument."

        if not self:

            raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)

    def _get_file(self, mode='rb'):

    def _get_file(self):

        self._require_file()

        if not hasattr(self, '_file') or self._file is None:

            self._file = self.storage.open(self.name, mode)

            self._file = self.storage.open(self.name, 'rb')

        return self._file

    def _set_file(self, file):

    size = property(_get_size)

    def open(self, mode='rb'):

        self._get_file(mode)

        self._require_file()

        self.file.open(mode)

    # open() doesn't alter the file's contents, but it does reset the pointer

    open.alters_data = True

        self.assertEqual(list(obj.normal.chunks(chunk_size=2)), [b"co", b"nt", b"en", b"t"])

        obj.normal.close()

    def test_filefield_write(self):

        # Files can be written to.

        obj = Storage.objects.create(normal=SimpleUploadedFile('rewritten.txt', b'content'))

        with obj.normal as normal:

            normal.open('wb')

            normal.write(b'updated')

        obj.refresh_from_db()

        self.assertEqual(obj.normal.read(), b'updated')

        obj.normal.close()

    def test_duplicate_filename(self):

        # Multiple files with the same name get _(7 random chars) appended to them.

        objs = [Storage() for i in range(2)]