Re: How can I filter query sets in a django template?

[codecowboy]

Thank you Daniel and Florian (Merci beaucoup.  Je parle francais un
petit).

I think that I will be able to use both templates and custom model
methods to accomplish what I am trying.



On Apr 5, 4:18 pm, Daniel Roseman 
wrote:
> On Apr 5, 8:49 pm, codecowboy  wrote:
>
>
>
> > I posted a question earlier today about circular imports (http://
> > groups.google.com/group/django-users/t/6119e979131c8c25).  I now have
> > a follow question to that.  I've got the following view logic.
>
> > def portal(request):
> >     scientist_id = 1
> >     s = get_object_or_404(Scientist, pk=scientist_id)
> >     return render_to_response('scientists/portal.html',
> > {'scientist':s})
>
> > Now, Scientists are related (many-to-many) to Conferences through
> > ConferenceAttendee.  Both of these models are created in a different
> > app.  I won't paste them in unless someone needs to see them in order
> > to answer my question.
>
> > I only want to loop through conferences that this scientist is
> > presenting.  (ConferenceAttendee.presenter=True).  I have tried
> > following the docs (http://docs.djangoproject.com/en/dev/topics/db/
> > queries/#field-lookups-intro), but it seems that you can only call the
> > filter method in python files like views.py or models.py.  I've tried
> > replacing the loop code below with "for ...conference._set.filter(...)
> > but python gives me errors when I do that.  Here is my template logic.
>
> > Your Presentations
>
> > 
> >     {% for conference in scientist.conference_set.all %}
> >         
> > {{ conference.title }}
> >     {% endfor %}
>
> > 
>
> > I've been stuck on this one for days now so any help would be greatly
> > appreciated.  Please do point me to any articles that I may have
> > missed that already answer this post.
>
> > Thank you,
>
> > Guy
>
> The issue is that in a template, you can't call any method or function
> that requires an argument. There are two ways of dealing with this:
> create a custom template tag or filter, or create a method that
> doesn't need arguments.
>
> In this case, I'd go with the second option. Just create a method on
> the Scientist model that returns a queryset of conferences at which
> they are a presenter.
>
> class Scientist(models.Model):
>      blah 
>
>     def presenting_conferences(self):
>         return self.conferences_set.filter(presenter=True)
>         #or whatever the filter is
>
> and in the template:
>
> {% for conference in scientists.presenting_conferences %}
> etc.
> --
> DR.
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Re: How can I filter query sets in a django template?

[Daniel Roseman]

On Apr 5, 8:49 pm, codecowboy  wrote:
> I posted a question earlier today about circular imports (http://
> groups.google.com/group/django-users/t/6119e979131c8c25).  I now have
> a follow question to that.  I've got the following view logic.
>
> def portal(request):
>     scientist_id = 1
>     s = get_object_or_404(Scientist, pk=scientist_id)
>     return render_to_response('scientists/portal.html',
> {'scientist':s})
>
> Now, Scientists are related (many-to-many) to Conferences through
> ConferenceAttendee.  Both of these models are created in a different
> app.  I won't paste them in unless someone needs to see them in order
> to answer my question.
>
> I only want to loop through conferences that this scientist is
> presenting.  (ConferenceAttendee.presenter=True).  I have tried
> following the docs (http://docs.djangoproject.com/en/dev/topics/db/
> queries/#field-lookups-intro), but it seems that you can only call the
> filter method in python files like views.py or models.py.  I've tried
> replacing the loop code below with "for ...conference._set.filter(...)
> but python gives me errors when I do that.  Here is my template logic.
>
> Your Presentations
>
> 
>     {% for conference in scientist.conference_set.all %}
>         
> {{ conference.title }}
>     {% endfor %}
>
> 
>
> I've been stuck on this one for days now so any help would be greatly
> appreciated.  Please do point me to any articles that I may have
> missed that already answer this post.
>
> Thank you,
>
> Guy

The issue is that in a template, you can't call any method or function
that requires an argument. There are two ways of dealing with this:
create a custom template tag or filter, or create a method that
doesn't need arguments.

In this case, I'd go with the second option. Just create a method on
the Scientist model that returns a queryset of conferences at which
they are a presenter.

class Scientist(models.Model):
 blah 

def presenting_conferences(self):
return self.conferences_set.filter(presenter=True)
#or whatever the filter is

and in the template:

{% for conference in scientists.presenting_conferences %}
etc.
--
DR.

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Re: How can I filter query sets in a django template?

[Florian Strzelecki]

Did you try to look at Inclusion Tag ?
http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#inclusion-tags

In template you are not allowed to use some python code... but with an
inclusion tag, you will be able to write this :

{% load related_conferences %}
{% related_conferences scientist %}

And your inclusion tag may be this :

@register.inclusion_tag('path/to/tag/related_conferences.html')
def related_conferences(scientist):
# define here list_of_conferences
return {'list': list_of_conferences}

The inclusion tag have been created for this : move python code into python
file ! Not into template files.

I hope this will help you.
And sorry for my English, I'm french. :)


2009/4/5 codecowboy 

>
> I posted a question earlier today about circular imports (http://
> groups.google.com/group/django-users/t/6119e979131c8c25).  I now have
> a follow question to that.  I've got the following view logic.
>
> def portal(request):
>scientist_id = 1
>s = get_object_or_404(Scientist, pk=scientist_id)
>return render_to_response('scientists/portal.html',
> {'scientist':s})
>
> Now, Scientists are related (many-to-many) to Conferences through
> ConferenceAttendee.  Both of these models are created in a different
> app.  I won't paste them in unless someone needs to see them in order
> to answer my question.
>
> I only want to loop through conferences that this scientist is
> presenting.  (ConferenceAttendee.presenter=True).  I have tried
> following the docs (http://docs.djangoproject.com/en/dev/topics/db/
> queries/#field-lookups-intro),
> but it seems that you can only call the
> filter method in python files like views.py or models.py.  I've tried
> replacing the loop code below with "for ...conference._set.filter(...)
> but python gives me errors when I do that.  Here is my template logic.
>
> Your Presentations
>
> 
>{% for conference in scientist.conference_set.all %}
>
> {{ conference.title }}
>{% endfor %}
>
> 
>
> I've been stuck on this one for days now so any help would be greatly
> appreciated.  Please do point me to any articles that I may have
> missed that already answer this post.
>
> Thank you,
>
> Guy
> >
>

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How can I filter query sets in a django template?

[codecowboy]

I posted a question earlier today about circular imports (http://
groups.google.com/group/django-users/t/6119e979131c8c25).  I now have
a follow question to that.  I've got the following view logic.

def portal(request):
scientist_id = 1
s = get_object_or_404(Scientist, pk=scientist_id)
return render_to_response('scientists/portal.html',
{'scientist':s})

Now, Scientists are related (many-to-many) to Conferences through
ConferenceAttendee.  Both of these models are created in a different
app.  I won't paste them in unless someone needs to see them in order
to answer my question.

I only want to loop through conferences that this scientist is
presenting.  (ConferenceAttendee.presenter=True).  I have tried
following the docs (http://docs.djangoproject.com/en/dev/topics/db/
queries/#field-lookups-intro), but it seems that you can only call the
filter method in python files like views.py or models.py.  I've tried
replacing the loop code below with "for ...conference._set.filter(...)
but python gives me errors when I do that.  Here is my template logic.

Your Presentations


{% for conference in scientist.conference_set.all %}

{{ conference.title }}
{% endfor %}



I've been stuck on this one for days now so any help would be greatly
appreciated.  Please do point me to any articles that I may have
missed that already answer this post.

Thank you,

Guy
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