set کردن مقادیر برای partner‌ها مانند product هنگام اضافه کردن محصول به سبد خرید

سلامدر این پروژه ای که استاد داره برای دوره میزنه امکان اضافه کردن چند فروشنده(partners) برای هر محصول رو دارههنگامی که فرم اضافه کردن محصول به سبد خرید رو به صورت دستی ایجاد میکنیم مشکلی وجود ندارد اماهنگامی که از فرم ساز جنگو برای ایجاد فرم استفاده میکنیم.نمیدونم که باید چطور partner رو مقداردهی اولیه کنم تا کاربر نتونه که به صورت دستی partner رو انتخاب کنه<pre class=\"ql-syntax\" spellcheck=\"false\">class Product(models.Model): product_type = models.ForeignKey( to=ProductType, on_delete=models.PROTECT, related_name=\'products\' ) upc = models.BigIntegerField(unique=True) title = models.CharField(max_length=32) slug = models.SlugField(max_length=32, unique=True) description = models.TextField(blank=True) is_available = models.BooleanField(default=True) quantity = models.PositiveSmallIntegerField(default=10) category = models.ForeignKey( to=Category, on_delete=models.PROTECT, related_name=\'products\' ) brand = models.ForeignKey( to=Brand, on_delete=models.PROTECT, related_name=\'products\' ) create_time = models.DateTimeField(auto_now_add=True) update_time = models.DateTimeField(auto_now=True) def __str__(self): return f\'[{self.product_type}] - {self.title}\' @property def get_stock(self): return self.partners.order_by(\'price\').first() @property def get_stocks(self): return self.partners.prefetch_related(\'partner\').exclude(partner_id=self.get_stock.partner.pk).order_by(\'price\') </pre> <pre class=\"ql-syntax\" spellcheck=\"false\">def product_detail_view(request, pk, slug): qs = Product.objects.select_related(\'category\', \'brand\').filter((Q(pk=pk) | Q(upc=pk)) & Q(slug=slug)) # hit-1 if qs.exists(): product = qs.first() else: return HttpResponse(\'Product Does Not Exist\') context = { \'product\': product, \'form\': AddToBasketForm(initial={\'product\': product.pk, \'quantity\': 1}) } return render(request, \'catalogue/product-detail.html\', context=context) </pre> <pre class=\"ql-syntax\" spellcheck=\"false\">class Partner(models.Model): name = models.CharField(max_length=48) def __str__(self): return self.name class PartnerStock(models.Model): product = models.ForeignKey( to=Product, on_delete=models.CASCADE, related_name=\'partners\' ) partner = models.ForeignKey( to=Partner, on_delete=models.CASCADE, related_name=\'products\' ) price = models.DecimalField(max_digits=10, decimal_places=2, default=0) def __str__(self): return f\'{self.product} - {self.partner} - {self.price}\' </pre> <pre class=\"ql-syntax\" spellcheck=\"false\">class Basket(models.Model): user = models.ForeignKey( to=User, on_delete=models.CASCADE, related_name=\'baskets\', null=True, blank=True ) create_time = models.DateTimeField(auto_now_add=True) def __str__(self): return f\'{self.user}\' def add(self, product, partner, quantity=1): if self.lines.filter(product=product, partner=partner).exists(): product_line = self.lines.filter(product=product, partner=partner).first() product_line.quantity += quantity product_line.save() else: product_line = self.lines.create(product=product, partner=partner, quantity=quantity) # product_line = BasketLine.objects.create(basket=self, product=product, quantity=quantity) return product_line def validate_user(self, user): if user.is_authenticated: if self.user is not None and self.user != user: return False if self.user is None: self.user = user self.save() elif self.user is not None: return False return True @classmethod def get_or_create_basket(cls, basket_id): if basket_id is None: basket = cls.objects.create() else: basket_qs = cls.objects.filter(pk=basket_id) if basket_qs.exists(): basket = basket_qs.first() else: basket = None return basket class BasketLine(models.Model): basket = models.ForeignKey( to=Basket, on_delete=models.CASCADE, related_name=\'lines\' ) product = models.ForeignKey( to=Product, on_delete=models.CASCADE, related_name=\'lines\' ) partner = models.ForeignKey( to=Partner, on_delete=models.CASCADE, related_name=\'lines\' ) quantity = models.PositiveSmallIntegerField(default=1) def __str__(self): return f\'{self.basket} - {self.product.title} - {self.quantity}\' </pre> <pre class=\"ql-syntax\" spellcheck=\"false\">class AddToBasketForm(forms.Form): product = forms.ModelChoiceField(queryset=Product.objects.all(), widget=forms.HiddenInput()) partner = forms.ModelChoiceField(queryset=Partner.objects.all()) quantity = forms.IntegerField() def save(self, basket): product = self.cleaned_data.get(\'product\') partner = self.cleaned_data.get(\'partner\') quantity = self.cleaned_data.get(\'quantity\') basket.add(product=product, partner=partner, quantity=quantity) return basket </pre> <pre class=\"ql-syntax\" spellcheck=\"false\"> @require_POST def add_to_basket(request): # TODO-1: Check if user has basket_id in cookie # TODO-2: Create and assign if doesn\'t have # TODO-2-1: Check if user is authenticated, set user to basket # TODO-3: Get product and partner from submitted form # TODO-4: Add product to the user basket lines # TODO-5: Return to the \'next\' url response = HttpResponseRedirect(request.POST.get(\'next\', \'/\')) basket_id = request.COOKIES.get(\'basket_id\', None) basket = Basket.get_or_create_basket(basket_id=basket_id) if basket is None: raise Http404 response.set_cookie(key=\'basket_id\', value=basket.id) if not basket.validate_user(user=request.user): raise Http404 form = AddToBasketForm(data=request.POST) if form.is_valid(): form.save(basket=basket) return response </pre> <pre class=\"ql-syntax\" spellcheck=\"false\"> {% block content %} <h1>Product Detail</h1> <p>title: {{ product.title }}</p> <p>category: {{ product.category.name }}</p> <p>brand: {{ product.brand.name }}</p> <p>quantity: {{ product.quantity }}</p> {% if product.get_stock %} <h4>- Recommended reseller</h4> <p class=\"partner\">partner: {{ product.get_stock.partner.name }}</p> <p class=\"price\">price: ${{ product.get_stock.price }}</p> <form method=\"post\" action=\"{% url \'basket:add-to-basket\' %}\"> {% csrf_token %} {{ form.as_p }} <input type=\"hidden\" name=\"next\" value=\"{{ request.build_absolute_uri }}\"> <button type=\"submit\">Add to basket</button> </form> <h4>- Other reseller</h4> {% for stock in product.get_stocks %} <div> <p class=\"partner\">partner: {{ stock.partner.name }}</p> <p class=\"price\">price: ${{ stock.price }}</p> <form method=\"post\" action=\"{% url \'basket:add-to-basket\' %}\"> {% csrf_token %} {{ form.as_p }} <input type=\"hidden\" name=\"next\" value=\"{{ request.build_absolute_uri }}\"> <button type=\"submit\">Add to basket</button> </form> </div> {% empty %} <h3>Not other reseller</h3> {% endfor %} {% endif %} {% endblock content %} </pre>