@update_query
    def hupdate(self, query, attr, updates):
        value = QueryWrapper('"%s" || %%s' % attr, [updates])
        field, model, direct, m2m = self.model._meta.get_field_by_name(attr)
        query.add_update_fields([(field, None, value)])
        return query
Updates the specified hstore.
dataset/ETHPy150Open djangonauts/djorm-ext-hstore/djorm_hstore/models.py/HStoreQuerysetMixin.hupdate