Added a model for logging actions

src/pretix/base/models/base.py

@@ -1,5 +1,6 @@
 import uuid
 
+from django.contrib.contenttypes.fields import GenericRelation
 from django.db import models
 from django.db.models.signals import post_delete
 from django.dispatch import receiver
@@ -26,3 +27,21 @@ def cached_file_delete(sender, instance, **kwargs):
     if instance.file:
         # Pass false so FileField doesn't save the model.
         instance.file.delete(False)
+
+
+class LoggedModel(models.Model):
+    logentries = GenericRelation('LogEntry')
+
+    def log_action(self, user, action, data):
+        from .log import LogEntry
+        from .event import Event
+
+        event = None
+        if isinstance(self, Event):
+            event = self
+        elif hasattr(self, 'event'):
+            event = self.event
+        LogEntry.objects.create(content_object=self, user=user, action=action, data=data, event=event)
+
+    class Meta:
+        abstract = True