Compare two variables in template system

Using Django
1

Hello, anyone has idea on compare two variables in template system? Someone used ifequal, but it has deprecated since version 3.1.

Thanks!

2

Doesn’t the == operator work? The docs say that ifequal is the obsolete way of saying ==.

3

oh, I see. I should wrote my question with more detail. So I was trying to generate a products list in a page, the list was under a brand, so I tried to pass a brand name as a
keyword argument to the url and want to compare the keyword argument with the brand field of products to get the queryset of the products of specific brand.

4

From this description, this isn’t something you would do in the template - this is work more appropriately done in a view.

You don’t want to mix your processing logic with your templates.

5

Yes, you are right! I tried on view, and didn’t figure out how to compare variables in query set like in filter, so I turned to template by using {% if product.brand == brandtag %}, but that’s not working, so I tried put those variable in {{product.brand}} and {{brandtag}} in template, they both showed up properly.

6

To be more clear, this is my code sample below, could you take a look what’s issue of my code is?

*Model.py*

class Brand(models.Model):
    name = models.CharField(max_length=20)

class Products(models.Model)
    ...
    brand = models.ForeignKey(Brand,on_delete=models.PROTECT)
    ...

*urls.py*

urlpatterns = [
    ...
    path('brand/<brandtag>', products_page.as_view(), name='products_page'),
    ...
    ]

*views.py*

class products_page(ListView):
    model = Products
    template_name = "core/products_page.html"

*products_page.html*

{% for product in products_list %}
      {% if product.brand == brandtag %}
              <p class="card-text">{{product.title}}</p>
              <p class="card-text">{{product.price}}</p>
      {% endif %}
{% endfor %}
7

Since you’re using ListView, you’ll want to create a get_queryset method for that class that filters Products by brandtag.

8

Thanks, I’ll learn more about filter first.