Understanding inheritance in Django

Question

I am trying to understand some basics in django inheritance - I'm sure it is something trivial, buy I just can't get it.

I've got my CartItemForm(forms.ModelForm) and I override init method to get user from post.request, like that:

def __init__(self, *args, **kwargs):
    self.request = kwargs.pop('request', None)
    super().__init__(*args, **kwargs)

And it works, but I don't really get why it doesn't work when I inherit init method first:

def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    self.request = kwargs.pop('request', None)

init() got an unexpected keyword argument 'request'

What am I missing here?

because forms.ModelForm doesn't recognize keyword request but in the first case you remove it by pop — splash58
– splash58, Commented Oct 26, 2019 at 19:36

Sayse · Accepted Answer · 2019-10-26 19:36:32Z

3

It doesn't work because the base class uses an explicit list of keyword args, and request isn't one of them

def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
                 initial=None, error_class=ErrorList, label_suffix=None,
                 empty_permitted=False, instance=None, use_required_attribute=None,
                 renderer=None):

For completeness, it works before hand because you're pop-ing the request keyword out of the keyword dictionary and no longer exists when you're calling super

answered Oct 26, 2019 at 19:36

Sayse

43.4k14 gold badges85 silver badges150 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Understanding inheritance in Django

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related