Hi,
this is a example with « joined table inheritance » feature :
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
discriminator = Column('type', String(50))
__mapper_args__ = {'polymorphic_on': discriminator}
class Contact(Base):
__tablename__ = 'contacts'
id = Column(Integer, primary_key=True)
discriminator = Column('type', String(50))
__mapper_args__ = {'polymorphic_on': discriminator}
class Employee(Base):
__tablename__ = 'employees'
__mapper_args__ = {'polymorphic_identity': 'employee'}
employee_id = Column('id', Integer, ForeignKey('user.id'),
primary_key=True)
class Customer(Base):
__tablename__ = 'customers'
__mapper_args__ = {'polymorphic_identity': 'customer'}
customer_id = Column('id', Integer, ForeignKey('user.id'),
primary_key=True)
Here Employee and Customer inherit from User class.
Now I would like append another heritage from Contact, then two
heritage (User and Contact).
It's possible to do that with SQLAlchemy ?
Thanks for your help.
Regards,
Stephane
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