Added totals

app/models.py

@@ -1,4 +1,6 @@
 from datetime import datetime
+from collections import defaultdict
+
 from app import db
 
 
@@ -90,6 +92,17 @@ class Order(db.Model):
     def __repr__(self):
         return 'Order %s' % (self.location.name)
 
+    def group_by_user(self):
+        group = defaultdict(list)
+        for item in self.orders:
+            group[item.user_id] += [item.food]
+        return group
+
+    def group_by_user_pay(self):
+        group = defaultdict(int)
+        for item in self.orders:
+            group[item.user] += item.food.price
+        return group
 
 class OrderItem(db.Model):
     id = db.Column(db.Integer, primary_key=True)

app/templates/order.html

@@ -20,6 +20,10 @@
             {{ item.user.username }} - {{ item.food.name }} - {{ item.food.price|euro }}
             {% if item.can_delete(order.id, current_user.id) -%}<a href="{{ url_for('.delete_item', order_id=order.id, item_id=item.id) }}"><span class="glyphicon glyphicon-remove"></span></a>{%- endif %}<br/>
         {% endfor %}
+        <h3>Debts</h3>
+        {% for key, value in total_payments.items() %}
+            {{ key.username }} - {{ value|euro }}<br/>
+        {% endfor %}
     </div>
     <div class="col-md-push-1 col-md-4">
         <h4>Order:</h4>

app/views/order.py

@@ -41,7 +41,8 @@ def order(id):
         form = OrderItemForm()
         form.populate(order.location)
         total_price = sum([o.food.price for o in order.orders])
-        return render_template('order.html', order=order, form=form, total_price=total_price)
+        total_payments = order.group_by_user_pay()
+        return render_template('order.html', order=order, form=form, total_price=total_price, total_payments=total_payments)
     return abort(404)