Invoicing: Configurable service date

src/pretix/base/models/invoices.py

@@ -33,6 +33,7 @@
 # License for the specific language governing permissions and limitations under the License.
 
 import string
+import warnings
 from decimal import Decimal
 
 import pycountry
@@ -404,10 +405,10 @@ class InvoiceLine(models.Model):
     :type tax_name: str
     :param subevent: The subevent this line refers to
     :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 period_start: Start if service period invoiced
+    :type period_start: datetime
+    :param period_end: End of service period invoiced
+    :type period_end: datetime
     :param event_location: Event location of the (sub)event at the time the invoice was created
     :type event_location: str
     :param item: The item this line refers to
@@ -426,8 +427,8 @@ class InvoiceLine(models.Model):
     tax_name = models.CharField(max_length=190)
     tax_code = models.CharField(max_length=190, null=True, blank=True)
     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)
+    period_start = models.DateTimeField(null=True)
+    period_end = models.DateTimeField(null=True)
     event_location = models.TextField(null=True, blank=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)
@@ -444,3 +445,35 @@ class InvoiceLine(models.Model):
 
     def __str__(self):
         return 'Line {} of invoice {}'.format(self.position, self.invoice)
+
+    @property
+    def event_date_from(self):
+        warnings.warn(
+            'InvoiceLine.event_date_from is deprecated, use period_start instead,',
+            category=DeprecationWarning,
+        )
+        return self.period_start
+
+    @event_date_from.setter
+    def event_date_from(self, value):
+        warnings.warn(
+            'InvoiceLine.event_date_from is deprecated, use period_start instead,',
+            category=DeprecationWarning,
+        )
+        self.period_start = value
+
+    @property
+    def event_date_to(self):
+        warnings.warn(
+            'InvoiceLine.event_date_to is deprecated, use period_end instead,',
+            category=DeprecationWarning,
+        )
+        return self.period_end
+
+    @event_date_to.setter
+    def event_date_to(self, value):
+        warnings.warn(
+            'InvoiceLine.event_date_to is deprecated, use period_end instead,',
+            category=DeprecationWarning,
+        )
+        self.period_to = value