Add field internal_reference to invoice addresses

src/pretix/presale/forms/checkout.py

@@ -85,7 +85,8 @@ class InvoiceAddressForm(forms.ModelForm):
 
     class Meta:
         model = InvoiceAddress
-        fields = ('is_business', 'company', 'name', 'street', 'zipcode', 'city', 'country', 'vat_id')
+        fields = ('is_business', 'company', 'name', 'street', 'zipcode', 'city', 'country', 'vat_id',
+                  'internal_reference')
         widgets = {
             'is_business': BusinessBooleanRadio,
             'street': forms.Textarea(attrs={'rows': 2, 'placeholder': _('Street and Number')}),
@@ -93,6 +94,7 @@ class InvoiceAddressForm(forms.ModelForm):
                                               'data-display-dependency': '#id_is_business_1'}),
             'name': forms.TextInput(attrs={'data-typocheck-source': '1'}),
             'vat_id': forms.TextInput(attrs={'data-display-dependency': '#id_is_business_1'}),
+            'internal_reference': forms.TextInput,
         }
         labels = {
             'is_business': ''

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

@@ -90,6 +90,8 @@
                                     <dt>{% trans "VAT ID" %}</dt>
                                     <dd>{{ addr.vat_id }}</dd>
                                 {% endif %}
+                                <dt>{% trans "Internal reference" %}</dt>
+                                <dd>{{ addr.internal_reference }}</dd>
                             </dl>
                         </div>
                     </div>

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

@@ -188,6 +188,8 @@
                                 <dt>{% trans "VAT ID" %}</dt>
                                 <dd>{{ order.invoice_address.vat_id }}</dd>
                             {% endif %}
+                            <dt>{% trans "Internal Reference" %}</dt>
+                            <dd>{{ order.invoice_address.internal_reference }}</dd>
                         </dl>
                     </div>
                 </div>

src/pretix/presale/views/order.py

@@ -409,6 +409,7 @@ class OrderInvoiceCreate(EventViewMixin, OrderDetailMixin, View):
 class OrderModify(EventViewMixin, OrderDetailMixin, QuestionsViewMixin, TemplateView):
     template_name = "pretixpresale/event/order_modify.html"
 
+    @cached_property
     def _positions_for_questions(self):
         return self.positions