| 150 | __mapper_args__ = {"polymorphic_on": punion.c.type} |
| 151 | |
| 152 | class Engineer(Employee): |
| 153 | __table__ = engineers |
| 154 | __mapper_args__ = { |
| 155 | "polymorphic_identity": "engineer", |
| 156 | "concrete": True, |
| 157 | } |
| 158 | |
| 159 | class Manager(Employee): |
| 160 | __table__ = managers |