sum in admin list view

apps/pg/admin.py

@@ -1,4 +1,6 @@
 from django.contrib import admin
+from django.db.models import Sum
+
 from .models import PaymentRequest, PNA, Fake
 
 
@@ -13,6 +15,17 @@ class PaymentRequestAdmin(admin.ModelAdmin):
     search_fields = ['application__uuid','application__client_id', 'amount', 'user__uuid']
     list_filter = ['application', 'state', 'gateway']
 
+    def changelist_view(self, request, extra_context=None):
+        extra_context = extra_context or {}
+
+        cl = self.get_changelist_instance(request)
+        queryset = cl.result_list
+        totals = queryset.aggregate(
+            total_amount=Sum('amount'),
+        )
+        extra_context['totals'] = totals
+        return super().changelist_view(request, extra_context=extra_context)
+
 
 class FakeAdmin(admin.ModelAdmin):
     list_display = [ 'created_at']

templates/admin/pg/paymentrequest/change_list.html

@@ -0,0 +1,11 @@
+{% extends "admin/change_list.html" %}
+{% load tags %}
+{% block result_list %}
+    {{ block.super }}
+    <div style="margin-top: 20px; padding: 10px; background: #f8f8f8;">
+        <h3>جمع کل:</h3>
+        <p></p>
+        <p>{{ totals.total_amount|default:"0"|amount_split_3digit }}</p>
+        <p></p>
+    </div>
+{% endblock %}