class MoreMaster(Master): mmp = db.StringProperty() mm=MoreMaster(mp='f', mmp='g') mm.put() d4 = Detail(dp='h', master=mm) d4.put() for d in mm.detail_set: print d.master.mmpIt printed 'g', thus resolving correctly that d4.master is derived class. So the "many to one" relation supports polymorphism, but "one to many" does not. The reason is db.Key already contains the name of the Model class. So when we do Master.get('LongLongKeyHere') the Datastore is able to create the correct class.
Saturday, December 20, 2008
Playing around with the Master and Details classes in the previous post, I tried to subclass a Master this time:
Posted by Andrew Skiba at 2:49 PM