How to override __new__ metaclass method of a model in Django

Question

I am using Django 1.6 and model inheritance in Django. What I wanna do is, hooking new class extending.

It would be done in Python like,

class Meta(type):
    def __new__(cls, name, bases, newattrs):
        do_what_you_want_before()
        result= super(Meta, cls).__new__(cls, name, bases, newattrs)
        do_what_you_want_after()
        return result

class Foo:
    __metaclass__ = Meta

class SubFoo(Foo):
    pass

When this part of code is initialized, custom __new__ method will be invoked.

How can I do that in Django with model inheritance. When you try to do this with Django Models, an error such that, is given:

TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

Thank you.

Answer 1

Instead of inheriting from type, inherit from django.db.models.base.ModelBase (source).