optimize subscriptions stats

subscription/templates/subscription/stats.jinja

@@ -13,12 +13,6 @@
 
   <canvas id="statsChart" width="400" height="200"></canvas>
 
-  {% trans %}Total subscriptions{% endtrans %} : {{ subscriptions_total.count() }}<br><br>
-  {% trans %}Subscriptions by type{% endtrans %}<br><br>
-  {% for location in locations %}
-    {{ location[1] }} : <i class="nb">{{ subscriptions_total.filter(location=location[0]).count() }}</i><br>
-  {% endfor %}
-
   <br>
   <table>
     <thead>
@@ -28,20 +22,27 @@
       {% endfor %}
       <th id="graphLabel">{% trans %}Total{% endtrans %}</th>
     </thead>
+    <tr>
+      <td>{% trans %}All subscriptions{% endtrans %}</td>
+      {% for location in locations %}
+        <td><i class="nb">{{ total_location[location[0]] }}</i><br></td>
+      {% endfor %}
+      <td><i class="nb">{{ total_location.values()|sum }}</i></td>
+    </tr>
     {% for type in subscriptions_types %}
       <tr>
         <td><i class="types">{{ subscriptions_types[type]['name'] }}</i></td>
-        {% set subscriptions_total_type = subscriptions_total.filter(subscription_type=type) %}
         {% for location in locations %}
           <td>
-            {% set subscriptions_total_type_location = subscriptions_total_type.filter(location=location[0]) %}
-            {% trans %}Total{% endtrans %} : {{ subscriptions_total_type_location.count()}}<br>
             {% for p_type in payment_types %}
-              {{ p_type[1] }} : <i class="nb">{{ subscriptions_total_type_location.filter(payment_method=p_type[0]).count()}}</i><br>
+              {% set subtotal = subscriptions[type][location[0]][p_type[0]] %}
+              {% if subtotal > 0 %}
+                {{ p_type[1] }} : <i class="nb">{{ subtotal }}</i><br>
+              {% endif %}
             {% endfor %}
           </td>
         {% endfor %}
-        <td class="total"><i class="nb">{{subscriptions_total_type.count()}}</i></td>
+        <td class="total"><i class="nb">{{ total_type[type] }}</i></td>
       </tr>
     {% endfor %}
   </table>

subscription/views.py

@@ -12,11 +12,13 @@
 # OR WITHIN THE LOCAL FILE "LICENSE"
 #
 #
+from collections import defaultdict
 
 from django.conf import settings
 from django.contrib.auth.forms import PasswordResetForm
 from django.contrib.auth.mixins import PermissionRequiredMixin
 from django.core.exceptions import PermissionDenied
+from django.db.models import Count
 from django.urls import reverse
 from django.utils.timezone import localdate
 from django.utils.translation import gettext_lazy as _
@@ -102,9 +104,28 @@ class SubscriptionsStatsView(TemplateView):
     def get_context_data(self, **kwargs):
         kwargs = super().get_context_data(**kwargs)
         today = localdate()
-        kwargs["subscriptions_total"] = Subscription.objects.filter(
+        qs = Subscription.objects.filter(
             subscription_end__gte=today, subscription_start__lte=today
         )
+        grouped = qs.values("subscription_type", "location", "payment_method").annotate(
+            count=Count("*")
+        )
+        by_location = qs.values("location").annotate(count=Count("*"))
+        by_type = qs.values("subscription_type").annotate(count=Count("*"))
+        kwargs["subscriptions"] = defaultdict(
+            lambda: defaultdict(lambda: defaultdict(int))
+        )
+        for sub in grouped:
+            kwargs["subscriptions"][sub["subscription_type"]][sub["location"]][
+                sub["payment_method"]
+            ] = sub["count"]
+        kwargs["total_location"] = defaultdict(
+            int, {i["location"]: i["count"] for i in by_location}
+        )
+        kwargs["total_type"] = defaultdict(
+            int, {i["subscription_type"]: i["count"] for i in by_type}
+        )
+
         kwargs["subscriptions_types"] = settings.SITH_SUBSCRIPTIONS
         kwargs["payment_types"] = settings.SITH_SUBSCRIPTION_PAYMENT_METHOD
         kwargs["locations"] = settings.SITH_SUBSCRIPTION_LOCATIONS