Add Subevent-Filter for Voucher-Tags (#1407)

* Add Subevent-Filter for Voucher-Tags

* Filter Subevent Voucher-Tags with proper Filter

* Apply filter before annotating totals and usage

src/pretix/control/forms/filter.py

@@ -902,6 +902,43 @@ class VoucherFilterForm(FilterForm):
         return qs
 
 
+class VoucherTagFilterForm(FilterForm):
+    subevent = forms.ModelChoiceField(
+        label=pgettext_lazy('subevent', 'Date'),
+        queryset=SubEvent.objects.none(),
+        required=False,
+        empty_label=pgettext_lazy('subevent', 'All dates')
+    )
+
+    def __init__(self, *args, **kwargs):
+        self.event = kwargs.pop('event')
+        super().__init__(*args, **kwargs)
+
+        if self.event.has_subevents:
+            self.fields['subevent'].queryset = self.event.subevents.all()
+            self.fields['subevent'].widget = Select2(
+                attrs={
+                    'data-model-select2': 'event',
+                    'data-select2-url': reverse('control:event.subevents.select2', kwargs={
+                        'event': self.event.slug,
+                        'organizer': self.event.organizer.slug,
+                    }),
+                    'data-placeholder': pgettext_lazy('subevent', 'All dates')
+                }
+            )
+            self.fields['subevent'].widget.choices = self.fields['subevent'].choices
+        elif 'subevent':
+            del self.fields['subevent']
+
+    def filter_qs(self, qs):
+        fdata = self.cleaned_data
+
+        if fdata.get('subevent'):
+            qs = qs.filter(subevent_id=fdata.get('subevent').pk)
+
+        return qs
+
+
 class RefundFilterForm(FilterForm):
     provider = forms.ChoiceField(
         label=_('Payment provider'),

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

@@ -1,5 +1,6 @@
 {% extends "pretixcontrol/event/base.html" %}
 {% load i18n %}
+{% load bootstrap3 %}
 {% block title %}{% trans "Voucher tags" %}{% endblock %}
 {% block content %}
     <h1>{% trans "Voucher tags" %}</h1>
@@ -8,6 +9,23 @@
             If you add a "tag" to a voucher, you can here see statistics on their usage.
         {% endblocktrans %}
     </p>
+    {% if request.event.has_subevents %}
+        <div class="row filter-form">
+            <form class="" action="" method="get">
+                    <div class="col-lg-2 col-sm-3 col-xs-6">
+                        {% bootstrap_field filter_form.subevent layout='inline' %}
+                    </div>
+                <div class="col-lg-1 col-sm-6 col-xs-6">
+                    <button class="btn btn-primary btn-block" type="submit">
+                        <span class="fa fa-filter"></span>
+                        <span class="hidden-md">
+                                {% trans "Filter" %}
+                            </span>
+                    </button>
+                </div>
+            </form>
+        </div>
+    {% endif %}
     {% if tags|length == 0 %}
         <div class="empty-collection">
             <p>

src/pretix/control/views/vouchers.py

@@ -19,7 +19,7 @@ from django.views.generic import (
 
 from pretix.base.models import CartPosition, LogEntry, OrderPosition, Voucher
 from pretix.base.models.vouchers import _generate_random_code
-from pretix.control.forms.filter import VoucherFilterForm
+from pretix.control.forms.filter import VoucherFilterForm, VoucherTagFilterForm
 from pretix.control.forms.vouchers import VoucherBulkForm, VoucherForm
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.control.signals import voucher_form_class
@@ -94,16 +94,27 @@ class VoucherTags(EventPermissionRequiredMixin, TemplateView):
     template_name = 'pretixcontrol/vouchers/tags.html'
     permission = 'can_view_vouchers'
 
-    def get_context_data(self, **kwargs):
-        ctx = super().get_context_data(**kwargs)
-
-        tags = self.request.event.vouchers.order_by('tag').filter(
+    def get_queryset(self):
+        qs = self.request.event.vouchers.order_by('tag').filter(
             tag__isnull=False,
             waitinglistentries__isnull=True
-        ).values('tag').annotate(
+        )
+
+        if self.filter_form.is_valid():
+            qs = self.filter_form.filter_qs(qs)
+
+        qs = qs.values('tag').annotate(
             total=Sum('max_usages'),
             redeemed=Sum('redeemed')
         )
+
+        return qs.distinct()
+
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(**kwargs)
+
+        tags = self.get_queryset()
+
         for t in tags:
             if t['total'] == 0:
                 t['percentage'] = 0
@@ -111,8 +122,13 @@ class VoucherTags(EventPermissionRequiredMixin, TemplateView):
                 t['percentage'] = int((t['redeemed'] / t['total']) * 100)
 
         ctx['tags'] = tags
+        ctx['filter_form'] = self.filter_form
         return ctx
 
+    @cached_property
+    def filter_form(self):
+        return VoucherTagFilterForm(data=self.request.GET, event=self.request.event)
+
 
 class VoucherDelete(EventPermissionRequiredMixin, DeleteView):
     model = Voucher