How to count the number of elements of each category in Django?

Question

I have a list of elements. There is a ‘status’ value here. I need a code that in an HTML page will show the total number of items for each ‘status’. How to do it?

For intance, there is the list in the page:

appnumber status
№54534534 accepted
%46342322 in process
%55745232 accepted
%67456452 denied
%76454534 accepted
%52864525 denied
%86752525 accepted

The result should be:

accepted - 4
denied - 2
in process - 1

My code:

home.html

<div class="headtext">
    <form method="GET" action="{% url 'search' %}">
        <input type="search" type="text" name="q" prequired placeholder="Put appnumber">
        <button type="submit">Find</button>
    </form>
</div>
<div>
  {% for application in object_list %}
        <div>
            <p>Application: {{ application.appnumber }}, status: {{ application.status }}</p>
        </div>
  {% endfor %}
</div>

views.py

class HomeView(ListView):
    model = Application
    template_name = 'home.html'

class Search(ListView):
    template_name = 'home.html'
    def get_queryset(self):
        return Application.objects.filter(appnumber__icontains=self.request.GET.get("q"))
    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data(*args, **kwargs)
        context["q"] = self.request.GET.get("q")
        return context

Asked By: Stew

||

Source

Answer 1

You can use Count with annotate() so:

from django.db.models import Count

class HomeView(ListView):
    model = Application
    template_name = 'home.html'
    
    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data(*args, **kwargs)
        status_counts = Application.objects.values('status').annotate(total=Count('status'))
        context['status_counts'] = status_counts
        return context

Then you can use status_counts in Template so:

<div class="headtext">
    <form method="GET" action="{% url 'search' %}">
        <input type="search" type="text" name="q" required placeholder="Put appnumber">
        <button type="submit">Find</button>
    </form>
</div>
<div>
  {% for application in object_list %}
        <div>
            <p>Application: {{ application.appnumber }}, status: {{ application.status }}</p>
        </div>
  {% endfor %}

  <h2>Status Counts</h2>
  <ul>
    {% for status_count in status_counts %}
      <li>{{ status_count.status }} - {{ status_count.total }}</li>
    {% endfor %}
  </ul>
</div>

Answered By: Sunderam Dubey

How to count the number of elements of each category in Django?

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