Trying to make Products have Attributes

[Alex Balter]

Hello! First of all, I wanted to thank all the contributors of oscar for their hard work. My first try to roll an e-commerece solution ran up against difficulties -- it's nigh impossible to produce a sufficiently mature codebase singlehandedly.

I am currently working on modifying Oscar for a situation where customers

order food for takeout, and have the ability to choose flavors, 

seasonings, side dishes, etc. 

To implement this feature I want to 'reattach' Product Attributes from ProductClasses

to Products and let the customer choose the specifics in the front-end (catalogue). 

Here I attempt to modify ProductAttribute model to point to Product instead of ProductClass:  

in models.py:

import ...

from oscar.apps.catalogue.abstract_models import AbstractProductAttribute, AbstractProduct

class ProductAttribute(AbstractProductAttribute):

    product = models.ForeignKey(

        'catalogue.Product',

        blank=True,

        on_delete=models.CASCADE,

        related_name='attributes',

        null=True,

        verbose_name=_("Product type"))

 

..........

..........

from oscar.apps.catalogue.models import *  # noqa

and use the new model to produce a formset:

in forms.py:

from myapp.catalogue.models import Product, ProductAttribute
from myapp.catalogue.forms import ProductAttributesForm

ProductAttributesFormSet = inlineformset_factory(Product,
                                                 ProductAttribute,
                                                 form=ProductAttributesFor,
                                                 extra=3)

this produces the following error: https://gist.github.com/anonymous/b8bb43c77096e00f58433e451d198306

I don't have a lot of experience with Django, so it's unclear to me wether this is a namespacing issue or faulty data modeling. 

As always, all feedback is appreciated.

Wishing a great day, Al