Question

Hello I seem to be having some problem involving counting in Django. I have a list of items which only displays its latest status. All of these items that has a status “Destroyed” have been removed. This prints nicely.

  status_items = models.StorageItem.objects.filter(client=client_id, itemstatushistory__isnull=False).distinct()

{% for item in status_items %}
        {{item.itemstatushistory_set.latest|cut:"Destroyed"}}
{% endfor %}

But I can’t count for some reason.

  status_items = models.StorageItem.objects.filter(client=client_id, itemstatushistory__isnull=False).distinct().count()

TypeError while rendering: 'int' object is not iterable

Answer 1

after

status_items = models.StorageItem.objects
                     .filter(client=client_id, itemstatushistory__isnull=False)
                     .distinct().count()

status_items will contain the count of items –> an intobject

using it in the template in {% for item in status_items %} will obviously generate an error.

you can leave it without the count() and in the template access to the count like this:

{{ status_items.count }}

The template system will call status_items.count() for you. More infos here: rendering-a-context

EDIT:

@Shehzad009 : What I am trying to achieve, is to
count all items that has their latest
status not destroyed. Because of the
one to many relationship, and because
I want to count the latest statuses
for each item only, it is a bit tricky

you could define status_items like this:

#storageItems where itemstatushistory__status != 'Destroyed'
storage_items = models.StorageItem.objects
                .filter(client=client_id,
                        itemstatushistory__isnull=False
                        )
                .distinct()

# list of items with latest status != 'Destroyed'
status_items = [item for item in storage_items 
                if item.itemstatushistory_set.latest().description !='Destroyed']

# list of items with latest status not in ['Destroyed', 'Out']
status_items = [item for item in storage_items
                if item.itemstatushistory_set.latest().description
                   not in ['Destroyed', 'Out']]

then in the template:

{# show items with latest status != destroyed  #}
{% for item in status_items %}
        {{ item }}
{% endfor %}

{# items with latest status != destroyed count #}
{{ status_items|length }}