CODEWITHSUNDEEP
pythondjango
A_K
A_K

Reputation: 912

Updating the quantity of items in a shopping Cart not working properly

I am working on a Django E-commerce Project, and I have been following a tutorial and afterwards I decided to redo it on my own without the tutorial but I am stuck in a small issue which I don't understand the logic behind it.

When a user adds an Item to Cart I want it to reflect on the no. of items that are showing on the navbar cart icon, but I am getting Invalid filter: 'cart_item_count'

Here is my Item model.py

class Item(models.Model):
    title = models.CharField(max_length=100)
    image = models.ImageField(blank=False, upload_to=upload_design_to)

class OrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    ordered = models.BooleanField(default=False)
    item = models.ForeignKey(Item, on_delete=models.CASCADE)
    quantity = models.IntegerField(default=1)
    variation = models.ManyToManyField(Variation)

The application name is store, so here is what I have been done in the tutorial

Added a new folder in the app with the name of templatetags and inside the template tags folder created file called cart_template_tags and here is what is inside it:

from django import template

from store.models import Order

register = template.Library()

@register.filter
def cart_item_count(user):
    if user.is_authenticated:
        qs = Order.objects.filter(user=user, ordered=False)
        if qs.exists():
            return qs[0].items.count()
    return 0

My question is how do I fix this error and I want to understand behind the logic of having cart_item_count as a filter?

Is there an easier way to do it?

Thank you

Upvotes: 0

Views: 347

Answers (1)

ha-neul
ha-neul

Reputation: 3248

According to django doc about custom template tags, you need to

  1. add {% load cart_template_tags %} in your template.
  2. restart your server in order to get the custom-tags working.

Upvotes: 1

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