def get(self, id, pk='id', deleted=False):
        try:
            if pk == 'id':
                id = int(id)
            if deleted:
                spec = {pk: id}
            else:
                spec = {pk: id, 'data': {'$exists': 1}}
            fields = {'_id': 0}
            row = self.db.docs.find_one(spec, fields)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return Document(**row)
        raise NotFoundError('%s %s not found' % (pk, id))
def test_nested_initializers(self):
        # test initializing nested structures
        class Phone(Structure):
            _fields_ = [("areacode", c_char*6),
                        ("number", c_char*12)]

        class Person(Structure):
            _fields_ = [("name", c_char * 12),
                        ("phone", Phone),
                        ("age", c_int)]

        p = Person(b"Someone", (b"1234", b"5678"), 5)

        self.assertEqual(p.name, b"Someone")
        self.assertEqual(p.phone.areacode, b"1234")
        self.assertEqual(p.phone.number, b"5678")
        self.assertEqual(p.age, 5)