Add reverse charge flag to invoices

src/pretix/base/migrations/0101_auto_20181025_2255.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.1 on 2018-10-25 22:55
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0100_auto_20181023_2300'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='reverse_charge',
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pretix/base/models/invoices.py

@@ -93,6 +93,7 @@ class Invoice(models.Model):
     locale = models.CharField(max_length=50, default='en')
     introductory_text = models.TextField(blank=True)
     additional_text = models.TextField(blank=True)
+    reverse_charge = models.BooleanField(default=False)
     payment_provider_text = models.TextField(blank=True)
     footer_text = models.TextField(blank=True)
     foreign_currency_display = models.CharField(max_length=50, null=True, blank=True)

src/pretix/base/services/invoices.py

@@ -14,6 +14,7 @@ from django.dispatch import receiver
 from django.utils import timezone
 from django.utils.timezone import now
 from django.utils.translation import pgettext, ugettext as _
+from django_countries.fields import Country
 from i18nfield.strings import LazyI18nString
 
 from pretix.base.i18n import language
@@ -152,6 +153,7 @@ def build_invoice(invoice: Invoice) -> Invoice:
                 "Reverse Charge: According to Article 194, 196 of Council Directive 2006/112/EEC, VAT liability "
                 "rests with the service recipient."
             )
+            invoice.reverse_charge = True
             invoice.save()
 
         offset = len(positions)
@@ -297,7 +299,15 @@ def build_preview_invoice_pdf(event):
         invoice.additional_text = str(additional).replace('\n', '<br />')
         invoice.footer_text = str(footer)
         invoice.payment_provider_text = str(payment).replace('\n', '<br />')
-        invoice.invoice_to = _("John Doe\n214th Example Street\n012345 Somecity")
+        invoice.invoice_to_name = _("John Doe")
+        invoice.invoice_to_street = _("214th Example Street")
+        invoice.invoice_to_zipcode = _("012345")
+        invoice.invoice_to_city = _('Sample city')
+        invoice.invoice_to_country = Country('DE')
+        invoice.invoice_to = '{}\n{}\n{} {}'.format(
+            invoice.invoice_to_name, invoice.invoice_to_street,
+            invoice.invoice_to_zipcode, invoice.invoice_to_city
+        )
         invoice.file = None
         invoice.save()
         invoice.lines.all().delete()