Question about Getting URL segment into a View

[RisenFenix]

I am a newby to Django (2.0) and need some assistance, please.  I have a list of Grocery Wholesale Vendors in one model and their Contacts in another with one to many join.  

The Model...

from django.conf import settings

from django.db import models

from django.urls import reverse

[...]

#Grocery Wholesale Table

class GroceryWholesale(models.Model):

    grocery_wholesaler = models.CharField(max_length=150)

    grocery_wholesaler_active = models.BooleanField(default=True)

    def __str__(self):

        """A string representation of the model."""

        return self.grocery_wholesaler[:50]

    class Meta:

        verbose_name_plural = "Grocery Wholesalers"

#Grocery Wholesale Contacts Table

class GroceryWholesaleContacts(models.Model):

    grocery_wholesaler = models.ForeignKey(GroceryWholesale, on_delete=models.CASCADE)

    contact_name = models.CharField(max_length=150, null=True)

    contact_phone = models.CharField(max_length=75,null=True)

    contact_mobile = models.CharField(max_length=75,null=True)

    contact_fax = models.CharField(max_length=75, null=True)

    contact_email = models.CharField(max_length=150, null=True)

    contact_notes = models.CharField(max_length=200, null=True)

    contact_active = models.BooleanField(default=True)

    def __str__(self):

        """A string representation of the model."""

        return self.contact_name[:50]

    class Meta:

        verbose_name_plural = "Grocery Wholesaler Contacts"

Then in my URLs I have 

from django.urls import path

from . import views

urlpatterns = [

    path('gwlist', views.GroceryWholesalersListView.as_view(), name='grocerywholesalers'),

    path('gwclist/<int:gwpk>/', views.GroceryWholesalersContactsListView.as_view(), name='grocerywholesalerscontacts'),

]

My Views I have 

from django.shortcuts import render

from django.contrib.auth.mixins import LoginRequiredMixin

from django.views.generic import ListView, DetailView

from django.views.generic import TemplateView

from django.urls import reverse

from django.http import HttpResponse

from . import models

from .models import GroceryWholesale, GroceryWholesaleContacts

# Create your views here.

class GroceryWholesalersListView(ListView):

    model = models.GroceryWholesale

    context_object_name = 'grocery_wholesalers'

    template_name = 'grocery_wholesaler_list.html'

    ordering = ['grocery_wholesaler']

class GroceryWholesalersContactsListView(ListView):

    model = models.GroceryWholesaleContacts

    context_object_name = 'grocery_contacts'

    template_name = 'grocery_wholesaler_contacts_list.html'

    ordering = ['contact_name']

    def get_queryset(self):

        return GroceryWholesaleContacts.objects.filter(grocery_wholesaler_id=request.gwpk)

It's the part in Red I am having trouble with.  If I hand type a primary key for the Grocery Wholesaler I get the correct filtered list of contacts  

IE

return GroceryWholesaleContacts.objects.filter(grocery_wholesaler_id='90') and that pulls up the Grocery Wholesaler contacts filtered to ONLY show the ones belonging to grocery_wholesale_id #90

BUT I am trying to figure out how to pull the PK code dynamically from the URL instead and I can't figure it out or what it is called to google for help.  My URL looks like this...  http://127.0.0.1:8000/clients/gwclist/90/

Any help is greatly appreciated.  I hope I explained this correctly.  

[Matthew Pava]

Use self.kwargs.get(‘gwpk’)

https://docs.djangoproject.com/en/2.0/topics/class-based-views/generic-display/#dynamic-filtering

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[RisenFenix]

Thank You!!!!!!! That got me going.  I have been working on this for days and you got me going in a few minutes!  I can't thank you enough!

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