[Answered ]-How can pass primary key to url Django

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I think your problem is that you’re extending a TemplateView and then treating it as if it’s a View.

If you override a TemplateView you should read the kwargs in the get_context_data method.
If you like a more "hands-on approach" (as myself) then get rid of the TemplateView and extend a normal View, and then override the get and post methods (as you’re doing right now).

from django.views import View

Edit: I took a second look

Error 1:

Maybe try this?

def get(self, request, *args, **kwargs):
    categories = CategoryModel.objects.all()
    categoryId = self.request.GET.get('SelectCategory')
    products = ProductModel.objects.filter(category_id=categoryId)
    vendor= VendorModel.objects.get(id=self.kwargs['vendor_id'])
    args = {'categories': categories, 'products': products, 'selectedCategory':  categoryId, 'vendor': vendor}
    return render(request, self.template_name, args)

In the URL you are asking for a kwarg (vendor_id) but then i dont see you using it anywhere. Also that error will appear everytime you go to that path and fail to specify the requested kwarg.
So when you try to run the VendorCategory view be sure your url has a /1/ or something at the end.

Error 2:

You are trying to assign a list to an int variable. No wonder it doesn’t work. My advice is to add:

print(self.request.POST.getlist('ProductSelect'))

in your post method and see what comes out. Then you can devise a way to unpack it and store it.
I mean, we already know it’s a list.. so you clearly cant assign multiple ids to the single object you’re creating. You should be creating a vendor first and then have a product creating loop to add products to that vendor.
Something like this might work:

categoryobj = self.request.GET.get('SelectCategory')
productobj = self.request.POST.getlist('ProductSelect')

try:
  vendor = VendorCategory.objects.create(
      vendor_id=self.request.vendor_id,
      category_id=categoryobj,
  )
  vendor.save()
  for product_id in productobj:
    product = ProductModel.objects.get(id=product_id)
    product.vendormodel = vendor
    product.save()

Now.. I think you got a mistake there where you write vendor = VendorCategory( or at least i’ve never seen this syntax and I don’t know what it’s supposed to accomplish. In my version i replaced it with VendorCategory.objects.create because that’s what i assumed you were trying to do.

Error 3:

In the template you’re using a |yesno filter with an int value. Are you trying to understand whether there’s an id at all?

You’re running a for cycle in which you possibly will select multiple values, in this case the item should have a "multiple" in it.
<select name="asdsad" multiple>

I find it odd that you have a <label> wrapping the entire <select>. The <label> should have for="field_id" and that’s it. Except really special cases.

Last but not least, you have a typo:

<input type="hidden" value={{  selectedCateogry }} name="ProductSelect">
👤Beikeni

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