Call method of the session template

[Ricardo]

Hi, I'm using django carton to shopping cart.

I am not able to call the method remove_single in my template. on line 15

I tried several ways but I can not.

If you can help

carton      ---> http://pastebin.com/X4FtHRZU

template  ---> http://pastebin.com/0AJYFB1x

thank you

Ricardo

[Bill Freeman]

The remove method requires an argument.  You're not supplying one (you can't in a template variable reference).

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[Ricardo Kamada]

I tried numerous times ...

but if I put that way 

{% 'item.remove_single' item.product %} or {% 'item.remove_single' product= item.product %}

blames this error " Invalid block tag: ''item.remove_single'', expected 'empty' ou 'endfor' "

Ricardo

2013/10/10 Bill Freeman <ke1...@gmail.com>

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[Bill Freeman]

No.  You can't pass an argument to a model method from the template.  I see two options for you:

1.  Rework the method so that the argument is optional, and if the argument is not provided, the method uses a reasonable default (maybe item.product?).

2. Write a custom template filter that lets you supply an argument

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[Daniel Roseman]

On Thursday, 10 October 2013 20:29:32 UTC+1, ke1g wrote:

No.  You can't pass an argument to a model method from the template.  I see two options for you:

1.  Rework the method so that the argument is optional, and if the argument is not provided, the method uses a reasonable default (maybe item.product?).

2. Write a custom template filter that lets you supply an argument

These answers all miss the point. The main problem is not that you need to pass an argument, it's that what you're trying to do makes *no sense at all* in the context of a template.

You can't make the href of a link just point to a model method. A link needs to be a URL. So it needs a view, and an entry in the urlconf pointing to that view. That urlconf entry, of course, can take an argument, but that argument can't be a "product", it needs to be some kind of ID or slug that can be represented in the URL. 

Once you've got the view and the URL, you can use the `{% url %}` tag to generate the value for your link:

    <a href="{% url "remove_single" item.id %}">

(although note that an action that removes an item should be a POST, not a simple GET link).

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DR.

[Ricardo Kamada]

I understand what you say, however I know only call methods using {% url 'app.view.func'%} or {%}% app.view.func.

As I understand this django-aap carton, the shopping cart in the session live. If it is in session I would have

access their methods and attributes. Well that's exactly what I'm not getting. Access method remove_single.

In this href = "" is an image that removes the items you want to call the method remove_simgle.

Actually I'm wrong in doing {% url%} because I do not want move pages. I just want to remove the item from the cart.

class Cart(object):

    """

    A cart that lives in the session.

    """

    #...

    #...

    def remove_single(self, product):

        """

        Removes a single product by decreasing the quantity.

        """

        if product not in self.products:

            return

        if self._items_dict[product.pk].quantity <= 1:

            # There's only 1 product left so we drop it

            del self._items_dict[product.pk]

        else:

            self._items_dict[product.pk].quantity -= 1

        self.session.modified = True

Ricardo

2013/10/11 Daniel Roseman <dan...@roseman.org.uk>

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[Daniel Roseman]

On Friday, 11 October 2013 13:45:01 UTC+1, Ricardo wrote:

I understand what you say, however I know only call methods using {% url 'app.view.func'%} or {%}% app.view.func.

As I understand this django-aap carton, the shopping cart in the session live. If it is in session I would have

access their methods and attributes. Well that's exactly what I'm not getting. Access method remove_single.

In this href = "" is an image that removes the items you want to call the method remove_simgle.

Actually I'm wrong in doing {% url%} because I do not want move pages. I just want to remove the item from the cart.

It makes absolutely no difference if it lives in the session, you still can only modify it by calling a URL on the server. By the time the user sees the template, it is rendered to just HTML. The HTML in the user's browser does not have access to the methods of a session object which lives on the server. The only thing you can do from the browser is call a URL.

Now, if you like, you can call that URL via Ajax, so the user doesn't actually have to navigate to another page: but the fact remains, the only way to modify something on the server - whether in the session, the db, or even a file on disk - is by calling a URL.

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DR.