Outside of checking the discriminator value is it possible to filter a
query by a class in an inheritance mapping?
class Employee(Base):
__tablename__ = 'employee'
id = Column(Integer, primary_key=True)
name = Column(String(50))
type = Column(String(20))
__mapper_args__ = {
'polymorphic_on':type,
'polymorphic_identity':'employee'
}
class Manager(Employee):
manager_data = Column(String(50))
__mapper_args__ = {
'polymorphic_identity':'manager'
}
class Engineer(Employee):
engineer_info = Column(String(50))
__mapper_args__ = {
'polymorphic_identity':'engineer'
}
and then query something like:
engineers = session.query(Employee).filter(isclass(Engineer)).all()
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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