Как получить названия полей модели Django 1.6?

class ParentClass(model.Models):
...

class ChildClass(ParentClass):
...

return [(obj._meta.get_field(field.name)) for field in obj._meta.fields]

def get_only_child_fields(obj):
        allfields = [(field.name) for field in obj._meta.fields]
        parentfields = [(field.name) for field in Product._meta.fields]
        return [f for f in allfields if f not in parentfields]