Hi all,
This list has been very helpful so far, thanks a lot. I was just
wondering if there is a transparent way to assign polymorphic
identities to ORM classes using single table inheritance. Let's say we
have a base Task class:
class Task(DeclarativeBase):
__tablename__ = 'Tasks'
id = Column(Integer)
name = Column(String)
type = Column(String) etc...
__mapper_args__ = {'polymorphic_on' : type}
now I want to declare multiple Task types like this:
class MyTask(Task):
__mapper_args__ = {'polymorphic_identity': 'MyTask'}
class YourTask(Task):
__mapper_args__ = {'polymorphic_identity': 'YourTask'}
This is the recommended way in the documentation for declarative
style. I was wondering if I could get rid of the explicit
"polymorphic_identity" setup in the subclasses by some clever
programming trick. I want to assign the polymorphic identity to be the
class __name__ automatically if that class extends Task class. I am
not very well versed in advanced python programming like decorators or
function/class wrappers, so I wanted to seek your opinion.
Thanks.
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