On Oct 14, 1:36 pm, grimmus <graham.col...@gmail.com> wrote:
> Thanks for your reply. Here's what i did so far
>
> i created a file called has_saved_link.py in my app's templatetags
> folder:
>
> from django.template import Library, Node
> from django.db.models import get_model
>
> register = Library()
>
> def has_saved_link(user, object):
> return user.savedlink_set.objects.filter(link=object).count()
>
> has_saved_link = register.tag(has_saved_link)
>
> Then, in my template i load the tag
>
> {% load has_saved_link %}
>
> But if i try and use your syntax below i get errors
>
> {% if user.is_authenticated and not user|has_saved_link:object %} -
> Error - Invalid filter: 'has_saved_link'
> {% if user.is_authenticated and not user.has_saved_link:object %} -
> Error - Could not parse the remainder: ':object' from
> 'user.has_saved_link:object'
>
> I think it's an issue with how the objects are being passed to the
> tag ?
>
> I'm a bit of a Noob with all this (as you can probably tell !!)
>
> Thanks
>
> On Oct 14, 12:16 pm, Daniel Roseman <dan...@roseman.org.uk> wrote:
>
>
>
> > On Oct 14, 10:38 am, grimmus <graham.col...@gmail.com> wrote:
>
> > > Hi,
>
> > > I have 2 Models, Link and SaveLink.
>
> > > Link allows URL's with title's and descripions to be added to the
> > > site.
> > > SaveLink allows the logged in user to save their favourite links.
>
> > > When i output all the links on the page i would like to check if the
> > > active user has already saved the current link.
>
> > > Something like
>
> > > {% if user.is_authenticated and not user.has_saved_link %}
> > > <p class="saveContainer" ><a id="{{object.id}}"
> > > href="{{object.get_save_url}}" class="save">Save</a>
> > > {% else if user.is_authenticated and user.has_saved_link %}
> > > <p>Already Saved</a>
> > > {% else %}
> > > <p><a href="/accounts/login/">Login to save</a>
> > > {% endif %}
>
> > > I have not made the user.has_saved_link function yet and am unsure how
> > > to tackle this. Maybe i could pass the current context back to a
> > > function and compare it against what the user has already saved ?
>
> > > Thanks in advance
>
> > Assuming that 'object' is the link to save, and that there is a
> > foreign key from SavedLink to Link, your lookup needs to be something
> > like:
> > user.savedlink_set.objects.filter(link=object)
>
> > So the question is how can we do that lookup in a template. I'd do it
> > as a filter, since these are easy to write and can be used in an {% if
> > %} tag.
>
> > @register.filter
> > def has_saved_link(user, object)
> > return user.savedlink_set.objects.filter(link=object).count()
>
> > Then you can do:
> > {% if user.is_authenticated and not user|has_saved_link:object %}
>
> > --
> > DR.
Your problem is here:
has_saved_link = register.tag(has_saved_link)
That should be:
has_saved_link = register.filter(has_saved_link)
or, as I originally did, use the @register.filter syntax at the top of
the function. This is the preferred way of doing things except if
you're on Python 2.3.
--
DR.
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