Python sqlalchemy.ext.declarative.ConcreteBase() Examples

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Example #1
Source File: test_inheritance.py    From sqlalchemy with MIT License 4 votes vote down vote up 
def test_concrete_extension(self):
        class Employee(ConcreteBase, Base, fixtures.ComparableEntity):
            __tablename__ = "employee"
            employee_id = Column(
                Integer, primary_key=True, test_needs_autoincrement=True
            )
            name = Column(String(50))
            __mapper_args__ = {
                "polymorphic_identity": "employee",
                "concrete": True,
            }

        class Manager(Employee):
            __tablename__ = "manager"
            employee_id = Column(
                Integer, primary_key=True, test_needs_autoincrement=True
            )
            name = Column(String(50))
            golf_swing = Column(String(40))
            __mapper_args__ = {
                "polymorphic_identity": "manager",
                "concrete": True,
            }

        class Boss(Manager):
            __tablename__ = "boss"
            employee_id = Column(
                Integer, primary_key=True, test_needs_autoincrement=True
            )
            name = Column(String(50))
            golf_swing = Column(String(40))
            __mapper_args__ = {
                "polymorphic_identity": "boss",
                "concrete": True,
            }

        class Engineer(Employee):
            __tablename__ = "engineer"
            employee_id = Column(
                Integer, primary_key=True, test_needs_autoincrement=True
            )
            name = Column(String(50))
            primary_language = Column(String(40))
            __mapper_args__ = {
                "polymorphic_identity": "engineer",
                "concrete": True,
            }

        self._roundtrip(Employee, Manager, Engineer, Boss)