gistfile1.txt

                            Column('volume_type_id',
                                   String(length=36,
                                          convert_unicode=True,
                                          assert_unicode=None,
                                          unicode_error=None,
                                          _warn_on_bytestring=False),
                                   ForeignKey('volume_types.id'),
                                   nullable=False),



mysql> explain volume_types;
+------------+--------------+------+-----+---------+-------+
| Field      | Type         | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+-------+
| created_at | datetime     | YES  |     | NULL    |       |
| updated_at | datetime     | YES  |     | NULL    |       |
| deleted_at | datetime     | YES  |     | NULL    |       |
| deleted    | tinyint(1)   | YES  |     | NULL    |       |
| id         | varchar(36)  | NO   | PRI | NULL    |       |
| name       | varchar(255) | YES  |     | NULL    |       |
+------------+--------------+------+-----+---------+-------+