Hi again, 2012/7/7 Tomas Neme <lacrymol...@gmail.com>: >> The big difference is, -as I see it- I will not get real polymorphism, >> as the base class would need to do the join on all it's child classes. >> Is that true? > > with abstract models you won't get polymorphism at all, in the > database level (this is, you WON'T be able to do Fruit.objects....). > You'll mostly just be sharing structure and behavior, saving yourself > some repetition. > > With multi table inheritane (MTI) you get three tables, one for Fruits > one for Oranges and one for Apples, Fruits have a row for every Orange > and every Apple, so you can do Fruit.objects.all(). Knowing whether > this is an orange or an apple is trickier, but not too much >
...but using the django abstraction, what would happen, if I implement this as MTI? Say I implement the functions: def Fruit.rott(): pass def Apple.rott(): get_wrinkles() def Orange.rott(): color=green and I do for fruit in Fruits.objects.all(): fruit.rott() will anything happen at all? I know in C++ this would work... ;-) on database-level I know how to do it, I just don't know if the django abstraction handles this automalically. Seems I have too little faith in the capabilities of python ;-) Best regards Daniel -- Daniel Walz - mcj...@gmail.com Bremen, Germany -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
