tienda_ilusion/don_confiao/models.py

@@ -41,6 +41,11 @@ class Sale(models.Model):
         return f"{self.date} {self.customer}"
 
 
+    def get_total(self):
+        lines = self.saleline_set.all()
+        return sum([l.quantity * l.unit_price for l in lines])
+
+
 class SaleLine(models.Model):
 
     sale = models.ForeignKey(Sale, on_delete=models.CASCADE)

tienda_ilusion/don_confiao/templates/don_confiao/purchase_summary.html

@@ -1,3 +1,7 @@
-<p><b>Date:</b> {{ purchase.date }}</p>
+<h1>Resumen de compra</h1>
-<p><b>ID:</b> {{ purchase.id }}</p>
+<dl>
-<p><b>Customer:</b> {{ purchase.customer }}</p>
+<dt>Date</dt> <dd>{{ purchase.date }}</dd>
+<dt>ID</dt> <dd>{{ purchase.id }}</dd>
+<dt>Customer</dt> <dd>{{ purchase.customer }}</dd>
+<dt>Total</dt> <dd>{{ purchase.get_total }}</dd>
+</dl>