Group identical add-ons in cart (#2500)

Co-authored-by: Richard Schreiber <schreiber@rami.io>

src/pretix/base/email.py

@@ -177,7 +177,7 @@ class TemplateBasedMailRenderer(BaseHTMLMailRenderer):
                     op.variation,
                     op.subevent,
                     op.attendee_name,
-                    (op.pk if op.addon_to_id else None),
+                    op.addon_to_id,
                     (op.pk if op.has_addons else None)
                 )
             )]

src/pretix/base/models/orders.py

@@ -1330,6 +1330,10 @@ class AbstractPosition(models.Model):
         else:
             return {}
 
+    @property
+    def item_and_variation(self):
+        return self.item, self.variation
+
     @meta_info_data.setter
     def meta_info_data(self, d):
         self.meta_info = json.dumps(d)

src/pretix/base/templates/pretixbase/email/order_details.html

@@ -90,13 +90,16 @@
                         {% for groupkey, positions in cart %}
                             <tr>
                                 <td>
-                                    {% if not groupkey.4 %} {# is addon #}
+                                    {% if not groupkey.4 %} {# is not addon #}
                                         {{ positions|length }}x
                                     {% endif %}
                                 </td>
                                 <td>
                                     {% if groupkey.4 %} {# is addon #}
                                         +
+                                        {% if positions|length > 1 %}
+                                            {{ positions|length }}x
+                                        {% endif %}
                                     {% endif %}
                                     {{ groupkey.0.name }}{% if groupkey.1 %} – {{ groupkey.1.value }}{% endif %}
                                     {% if groupkey.2 %} {# subevent #}

src/pretix/presale/templates/pretixpresale/event/checkout_questions.html

@@ -121,8 +121,9 @@
                                     </label>
                                     <div class="col-md-9 form-control-text">
                                         <ul class="addon-list">
-                                            {% for a in pos.addons.all %}
+                                            {% regroup pos.addons.all by item_and_variation as addons_by_itemvar %}
-                                                <li>{{ a.item.name }}{% if a.variation %} – {{ a.variation.value }}{% endif %}</li>
+                                            {% for group in addons_by_itemvar %}
+                                                <li>{% if group.list|length > 1 %}{{ group.list|length }}&times; {% endif %}{{ group.grouper.0.name }}{% if group.grouper.1 %} – {{ group.grouper.1.value }}{% endif %}</li>
                                             {% endfor %}
                                         </ul>
                                     </div>

src/pretix/presale/templates/pretixpresale/event/fragment_cart.html

@@ -205,7 +205,7 @@
                 {% endif %}
                 </div>
             {% elif line.addon_to %}
-                <div role="cell" class="count">&nbsp;</div>
+                <div role="cell" class="count">{% if line.count == 1 %}&nbsp;{% else %}{{ line.count }}{% endif %}</div>
                 <div role="cell" class="singleprice price">
                     {% if event.settings.display_net_prices %}
                         {{ line.net_price|money:event.currency }}

src/pretix/presale/views/__init__.py

@@ -35,7 +35,7 @@
 from collections import defaultdict
 from datetime import datetime, timedelta
 from decimal import Decimal
-from functools import wraps
+from functools import partial, wraps
 from itertools import groupby
 
 from django.conf import settings
@@ -145,7 +145,7 @@ class CartMixin:
         # Group items of the same variation
         # We do this by list manipulations instead of a GROUP BY query, as
         # Django is unable to join related models in a .values() query
-        def keyfunc(pos):
+        def keyfunc(pos, for_sorting=False):
             if isinstance(pos, OrderPosition):
                 if pos.addon_to_id:
                     i = pos.addon_to.positionid
@@ -167,12 +167,11 @@ class CartMixin:
 
             if downloads \
                     or pos.pk in has_addons \
-                    or pos.addon_to_id \
                     or pos.item.issue_giftcard \
                     or (answers and (has_attendee_data or bool(pos.item.questions.all()))):  # do not use .exists() to re-use prefetch cache
                 return (
                     # standalone positions are grouped by main product position id, addons below them also sorted by position id
-                    i, addon_penalty, pos.pk,
+                    i, addon_penalty, pos.positionid if isinstance(pos, OrderPosition) else pos.pk,
                     # all other places are only used for positions that can be grouped. We just put zeros.
                 ) + (0, ) * 10
 
@@ -180,13 +179,22 @@ class CartMixin:
             category_key = (pos.item.category.position, pos.item.category.id) if pos.item.category is not None else (0, 0)
             item_key = pos.item.position, pos.item_id
             variation_key = (pos.variation.position, pos.variation.id) if pos.variation is not None else (0, 0)
+            grp = category_key + item_key + variation_key + (pos.price, (pos.voucher_id or 0), (pos.subevent_id or 0), (pos.seat_id or 0))
+            if pos.addon_to_id:
+                if for_sorting:
+                    ii = pos.positionid if isinstance(pos, OrderPosition) else pos.pk
+                else:
+                    ii = 0
+                return (
+                    i, addon_penalty, ii,
+                ) + category_key + item_key + variation_key + (pos.price, (pos.voucher_id or 0), (pos.subevent_id or 0), (pos.seat_id or 0))
             return (
                 # These are grouped by attributes so we don't put any position ids
                 0, 0, 0,
-            ) + category_key + item_key + variation_key + (pos.price, (pos.voucher_id or 0), (pos.subevent_id or 0), (pos.seat_id or 0))
+            ) + grp
 
         positions = []
-        for k, g in groupby(sorted(lcp, key=keyfunc), key=keyfunc):
+        for k, g in groupby(sorted(lcp, key=partial(keyfunc, for_sorting=True)), key=keyfunc):
             g = list(g)
             group = g[0]
             group.count = len(g)

src/pretix/static/pretixpresale/scss/_cart.scss

@@ -12,7 +12,7 @@
     .count form {
         display: inline;
     }
-    .price, .count, .download-desktop {
+    .price, .download-desktop {
         text-align: right;
     }
     .price small,
@@ -55,6 +55,7 @@
     }
     .count {
         width: percentage((2 / $grid-columns));
+        text-align: center;
     }
     .singleprice, .totalprice {
         width: percentage((3 / $grid-columns));