Sorting related items in a Django template

Question

Is it possible to sort a set of related items in a DJango template?

That is: this code (with HTML tags omitted for clarity):

{% for event in eventsCo         


        

Answer 1

You need to specify the ordering in the attendee model, like this. For example (assuming your model class is named Attendee):

class Attendee(models.Model):
    class Meta:
        ordering = ['last_name']

See the manual for further reference.

EDIT. Another solution is to add a property to your Event model, that you can access from your template:

class Event(models.Model):
# ...
@property
def sorted_attendee_set(self):
    return self.attendee_set.order_by('last_name')

You could define more of these as you need them...

Answer 2

You can use template filter dictsort https://docs.djangoproject.com/en/dev/ref/templates/builtins/#std:templatefilter-dictsort

This should work:

{% for event in eventsCollection %}
   {{ event.location }}
   {% for attendee in event.attendee_set.all|dictsort:"last_name" %}
     {{ attendee.first_name }} {{ attendee.last_name }}
   {% endfor %}
 {% endfor %}

Answer 3

regroup should be able to do what you want, but is there a reason you can't order them the way you want back in the view?

Answer 4

One solution is to make a custom templatag:

@register.filter
def order_by(queryset, args):
    args = [x.strip() for x in args.split(',')]
    return queryset.order_by(*args)

use like this:

{% for image in instance.folder.files|order_by:"original_filename" %}
   ...
{% endfor %}