I would like to ask for a little help regarding a code since when I start it tells me this following error:

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Here are the views and code

def add(request):

    cart = get_or_create_cart(request)
    producto = Producto.objects.get(pk=request.POST.get('product_id'))

    cart.productos.add(producto)

    return render(request, 'carts/add.html', {
        'producto': producto
    })

enter image description here

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CodePudding user response：

Add primary_key=True to cart_id column. Since you have not added it django added a pk field id which is what it's expecting when you query.

After the change make the template code to use cart_id instead of id

CodePudding user response：

You are supplying product_id in the add views as post data but by default django views handles GET request. So, either change views to include product_id as argument and this function will works or change function to handle post request.

Using GET method

def add(request, product_id):
    cart = get_or_create_cart(request)
    producto = Producto.objects.get(pk=product_id)
    cart.productos.add(producto)
    return render(request, 'carts/add.html', {
        'producto': producto
    })

and your url patterns look like following

path('<int:product_id>/', add, name='add')

Using POST request

def add(request):
    if request.method == "POST":
        cart = get_or_create_cart(request)
        producto = Producto.objects.get(pk=request.POST.get('product_id'))
        cart.productos.add(producto)
        return render(request, 'carts/add.html', {
            'producto': producto
        })
    else:
         # something you would like (GET method)