Django 模板：如果..在

Question

I have a list of products and want to display them in a template, depending on whether or not the product's dealer is "owned" by the current logged user or not. So here's my view:

class ArticleListView(ListView, LoginRequiredMixin):
    template_name = "accounts/list_article_quentin.html"
    model = Product
    def get_context_data(self,**kwargs):
        context = super().get_context_data(**kwargs)
        context["website"] = Website.objects.first()
        context["product_list"] = context["product_list"].filter(published=True)
        # Get a list of all dealers associated to the current users.
        currentUserDealers = self.request.user.dealers.all().values_list('id', flat=True)
        context["current_user_dealers"] = list(currentUserDealers)
        return context

so currentUserDealers is the list of the dealers associated to the current user (It's a ManyToMany relationship between dealers and users).

Here's the Products and Dealers models (only the relevant parts):

class Product(models.Model, CloneMixin):
    published = models.BooleanField(null=True,blank=True, default=False)
    title = models.CharField(null=True,blank=True,max_length=100)
    subtitle = models.CharField(null=True,blank=True,max_length=200)
    (...)
    dealer = models.ManyToManyField(Dealer, null=True,editable=True,related_name="product_to_dealer")
    (...)
    # Not sure what this does:
   _clone_many_to_many_fields = ['parameter', 'tag', 'category', 'dealer','images']
    (...)

    
class Dealer(models.Model, CloneMixin):
    dealer_check = models.ForeignKey("self",null=True, blank=True, on_delete=models.SET_NULL)
    published = models.BooleanField(null=True,blank=True, default=True)
    (...)
    users = models.ManyToManyField(User,null=True,blank=True, related_name='dealers')
    (...) 

In my template, I would like to do something like that to decide wether to display the product or not:

{% if product.dealer.all.0.pk in current_user_dealer %}

(there can be multiple dealers for a product but I'll see that later, hence the all.0)

Obviously this doesn't work but you get the idea, I want to see if the current product's dealer ID is in the list of current user's associated dealers, to see if we display it or not. What's the syntax to do it in the template? Or maybe there's a better way to do this directly in the view?

Answer 1

This query should get you the correct product_list in your template

def get_context_data(self):
    context = super(ArticleListView, self).get_context_data(**kwargs)
    context['product_list'] = Product.objects.filter(dealer__id_in=self.request.user.dealers.all())
    return context