from django.http import JsonResponse
import json

from django.core import serializers

def product_list(request, category_slug=None):
    category = None
    categories = Category.objects.all()
    products = Product.objects.filter(available=True)
    if category_slug:
        category = get_object_or_404(Category, slug=category_slug)
        products = products.filter(category=category)
        filter_products = list(products)
        return JsonResponse(serializers.serialize('json', filter_products), safe=True)

    return render(request,
                  'shop/product/list.html',
                      {'category': category,
                   'categories': categories,
                   'products': products})