Python Inheritance, Move method to a common class

Question

I am forgetting OOP terminology which was related to inheritance and which used classes dynamically. Here is what I am looking for.

    @classmethod
    def _match_slug(cls, slug):
        """ Method that checks if we still have a match in the db for current 'slug' """
        return cls.objects.filter(slug=slug).count()

I have 10 models in my application and each has this _match_slug method. I want to take this method to the parent class, so when I call self._match_slug(slug_to_check) it calls the method with its appropriate class cls.

Thoughts?

I think what you are referring to is Polymorphism. I thinkt the method should work as is if it is defined int he parent class. Are you getting any errors when attempting to use it? — Brobin
– Brobin, Commented Jul 31, 2015 at 16:53
You probably want to make a Mixin and use it as base class for you 10 models. — 301_Moved_Permanently
– 301_Moved_Permanently, Commented Jul 31, 2015 at 16:59
I havn't tried it, and I was confused about what it was and how to use that, I had a concept in my mind. Can somone write a demo code for python? — A.J.
– A.J., Commented Jul 31, 2015 at 17:16
You already have it! Move that method to a class, and make sure all of your models extend it, like this class MyModel(Parent): — Brobin
– Brobin, Commented Jul 31, 2015 at 17:17

chepner · Accepted Answer · 2015-07-31 17:21:22Z

1

Move the method to your parent class:

class Parent(object):

    @classmethod
    def _match_slug(cls, slug):
        """ Method that checks if we still have a match in the db for current 'slug' """
        return cls.objects.filter(slug=slug).count()

class Child(Parent):
    ...

c = Child()
# Equivalent to Parent._match_slug(c.__class__, x)
c._match_slug(x)

answered Jul 31, 2015 at 17:21

chepner

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