Add new fields to invoice model and API

src/pretix/base/migrations/0178_auto_20210308_1326.py

@@ -0,0 +1,34 @@
+# Generated by Django 3.0.12 on 2021-03-08 13:26
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0177_auto_20210301_1510'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoiceline',
+            name='attendee_name',
+            field=models.TextField(null=True),
+        ),
+        migrations.AddField(
+            model_name='invoiceline',
+            name='event_date_to',
+            field=models.DateTimeField(null=True),
+        ),
+        migrations.AddField(
+            model_name='invoiceline',
+            name='item',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='pretixbase.Item'),
+        ),
+        migrations.AddField(
+            model_name='invoiceline',
+            name='variation',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='pretixbase.ItemVariation'),
+        ),
+    ]

src/pretix/base/models/invoices.py

@@ -273,6 +273,14 @@ class InvoiceLine(models.Model):
     :type subevent: SubEvent
     :param event_date_from: Event date of the (sub)event at the time the invoice was created
     :type event_date_from: datetime
+    :param event_date_to: Event end date of the (sub)event at the time the invoice was created
+    :type event_date_to: datetime
+    :param item: The item this line refers to
+    :type item: Item
+    :param variation: The variation this line refers to
+    :type variation: ItemVariation
+    :param attendee_name: The attendee name at the time the invoice was created
+    :type attendee_name: str
     """
     invoice = models.ForeignKey('Invoice', related_name='lines', on_delete=models.CASCADE)
     position = models.PositiveIntegerField(default=0)
@@ -283,6 +291,10 @@ class InvoiceLine(models.Model):
     tax_name = models.CharField(max_length=190)
     subevent = models.ForeignKey('SubEvent', null=True, blank=True, on_delete=models.PROTECT)
     event_date_from = models.DateTimeField(null=True)
+    event_date_to = models.DateTimeField(null=True)
+    item = models.ForeignKey('Item', null=True, blank=True, on_delete=models.PROTECT)
+    variation = models.ForeignKey('ItemVariation', null=True, blank=True, on_delete=models.PROTECT)
+    attendee_name = models.TextField(null=True, blank=True)
 
     @property
     def net_value(self):

src/pretix/base/services/invoices.py

@@ -171,9 +171,17 @@ def build_invoice(invoice: Invoice) -> Invoice:
             if invoice.event.has_subevents:
                 desc += "<br />" + pgettext("subevent", "Date: {}").format(p.subevent)
             InvoiceLine.objects.create(
-                position=i, invoice=invoice, description=desc,
-                gross_value=p.price, tax_value=p.tax_value,
-                subevent=p.subevent, event_date_from=(p.subevent.date_from if p.subevent else invoice.event.date_from),
+                position=i,
+                invoice=invoice,
+                description=desc,
+                gross_value=p.price,
+                tax_value=p.tax_value,
+                subevent=p.subevent,
+                item=p.item,
+                variation=p.variation,
+                attendee_name=p.attendee_name if invoice.event.settings.invoice_attendee_name else None,
+                event_date_from=p.subevent.date_from if invoice.event.has_subevents else invoice.event.date_from,
+                event_date_to=p.subevent.date_to if invoice.event.has_subevents else invoice.event.date_to,
                 tax_rate=p.tax_rate, tax_name=p.tax_rule.name if p.tax_rule else ''
             )
 
@@ -198,6 +206,8 @@ def build_invoice(invoice: Invoice) -> Invoice:
                 invoice=invoice,
                 description=fee_title,
                 gross_value=fee.value,
+                event_date_from=None if invoice.event.has_subevents else invoice.event.date_from,
+                event_date_to=None if invoice.event.has_subevents else invoice.event.date_to,
                 tax_value=fee.tax_value,
                 tax_rate=fee.tax_rate,
                 tax_name=fee.tax_rule.name if fee.tax_rule else ''