How to write a POST method to an a tag in Django

Question

I am trying to write a POST method an "a" tag href but it is not working

I was successful writing it in another page to select from an option but I am trying to implement it in an a href but it is not working

<form method="POST" action="{{ item.get_add_to_cart_url }}">
{% csrf_token %}
<a href="{% url 'core:add-to-cart' order_item.item.slug %}"><i class="fas fa-plus ml-2"></a></i>
</form>

This is the HTML that I am trying to implement the same logic for which is working perfectly

                            {% csrf_token %}
                            <input class="btn btn-primary btn-md my-2 p" type="submit" value="Add to cart">

                            {% if object.variation_set.all %}

                            {% if object.variation_set.sizes %}
                        <select class="form-control" name="size">
                            {% for items in object.variation_set.sizes %}
                            <option value="{{ items.title|lower }}">{{ items.title|capfirst }}</option>
                            {% endfor %}                      
                        </select>
                        {% endif %}
                        {% endif %}

This is the views:

@login_required
def add_to_cart(request, slug):
    item = get_object_or_404(Item, slug=slug)
    order_item_qs = OrderItem.objects.filter(
        item=item,
        user=request.user,
        ordered=False
    )
    print(item)
    print(order_item_qs)
    item_var = []  # item variation
    if request.method == 'POST':
        for items in request.POST:
            key = items
            val = request.POST[key]
            try:
                v = Variation.objects.get(
                    item=item,
                    category__iexact=key,
                    title__iexact=val
                )
                item_var.append(v)
            except:
                pass

        if len(item_var) > 0:
            for items in item_var:
                order_item_qs = order_item_qs.filter(
                    variation__exact=items,
                )

    if order_item_qs.exists():
        order_item = order_item_qs.first()
        order_item.quantity += 1
        order_item.save()
    else:
        order_item = OrderItem.objects.create(
            item=item,
            user=request.user,
            ordered=False
        )
        order_item.variation.add(*item_var)
        order_item.save()

    order_qs = Order.objects.filter(user=request.user, ordered=False)
    if order_qs.exists():
        order = order_qs[0]
        # check if the order item is in the order
        if not order.items.filter(item__id=order_item.id).exists():
            order.items.add(order_item)
            messages.info(request, "This item quantity was updated.")
            return redirect("core:order-summary")
    else:
        ordered_date = timezone.now()
        order = Order.objects.create(
            user=request.user, ordered_date=ordered_date)
        order.items.add(order_item)
        messages.info(request, "This item was added to cart.")
        return redirect("core:order-summary")

Is this the best way to use a Post method?

Answer 1

Your form is not submitting anything, it's just an anchor with an href. Notice how the working code has an input of type submit.

There are many ways you can solve it, I propose two:

1. Add an input or button of type submit.

<input class="btn btn-primary btn-md my-2 p" type="submit" value="Add to cart">

2. Set a name attribute on the form, and call document.name.submit() when the link is clicked.

<form name="myForm">
...
<a onClick="document.myForm.submit()">...</a>
</form>

You can learn more about the a and form elements here and here