Seat-specific vouchers (#1486)

* Basic functionality

* API

* Do not delete seats with vouchers

* Show seat in list of seats

* Validate availability of seats

* Fix invalid logic in Seat.is_available

* Show voucher name in edit form

src/pretix/control/templates/pretixcontrol/vouchers/bulk.html

@@ -65,6 +65,9 @@
             {% if form.subevent %}
                 {% bootstrap_field form.subevent layout="control" %}
             {% endif %}
+            {% if "seats" in form.fields %}
+                {% bootstrap_field form.seats layout="control" %}
+            {% endif %}
         </fieldset>
         <fieldset>
             <legend>{% trans "Advanced settings" %}</legend>

src/pretix/control/templates/pretixcontrol/vouchers/detail.html

@@ -67,6 +67,9 @@
                     {% if form.subevent %}
                         {% bootstrap_field form.subevent layout="control" %}
                     {% endif %}
+                    {% if "seat" in form.fields %}
+                        {% bootstrap_field form.seat layout="control" %}
+                    {% endif %}
                 </fieldset>
                 <fieldset>
                     <legend>{% trans "Advanced settings" %}</legend>

src/pretix/control/templates/pretixcontrol/vouchers/index.html

@@ -133,6 +133,7 @@
                                         Any product in quota "{{ quota }}"
                                     {% endblocktrans %}
                                 {% endif %}
+                                {% if v.seat %}<br><small class="text-muted">{{ v.seat }}</small>{% endif %}
                             </td>
                             {% if request.event.has_subevents %}
                                 <td>{{ v.subevent.name }} – {{ v.subevent.get_date_range_display }}</td>