Doh! Yup I forgot that...cheers! :)
On Jan 12, 4:17 pm, "Karen Tracey" <[EMAIL PROTECTED]> wrote:
> On Jan 12, 2008 10:59 AM, Darthmahon <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> > Hey,
>
> > I want to check if the current item I am printing in one list is also
> > available in another list. Basically I have a list of books and I want
> > to check if the user already has a particular book in their profile so
> > that instead of it saying "Add Book", it says "Remove Book".
>
> > At the moment I am trying something like this:
>
> > ################
> > # File: custom_filters.py
> > ################
> > @register.filter
> > def IN(value,arg): return value in arg
> > ################
>
> > ################
> > # File: /books/views.py
> > ################
> > {% for book in books %}
> > {% if book.id|IN:user_profile.books.all %}
> > <p>Remove Book</p>
> > {% else %}
> > <p>Add Book</p>
> > {% endif %}
> > {% endfor %}
> > ################
>
> This is really your template file, right, not views.py?
>
> > user_profile has a many-to-many field relationship so that it gets a
> > list of all the books the user has.
>
> > Basically, I get an error that tells me:
>
> > Invalid Filter: 'IN'
>
> > Is there a better way of checking if the current item in the for loop
> > is present in another list?
>
> In my experience "Invalid" whatever from template processing usually means I
> forgot to load my custom template tags/filters. So did you include a {%
> load custom_filters %} in your template file?
>
> Karen
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