Add form fields/values at ModelForm level or at CBV level.

I have a model Product which a Foreign Key to a Company model. The Company Model has a OneToOne Relationship to user.

When a user submits a form to add product I need to associate the product with the company of the user (the user doesn't need to add manually the company in the form)

There are 2 methods:

1) adding a new user field in the ModelForm  __init__ method:

self.company = kwargs.pop('company')

and then at the CBV level using get_form_kwargs

kwargs['company'] = self.get_company()

2) or directlly at the CBV level using form_valid:

self.instance.company = self.get_company()

Which one is better (besides more lines for the first one) as implementation ? What is the difference ?

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