Refactor comments app to use mixins for comment functionality; update admin interfaces and add historical model fixes

history_tracking/custom_history.py

@@ -0,0 +1,61 @@
+from django.db import models
+from simple_history.models import HistoricalRecords
+from django.contrib.contenttypes.fields import GenericRelation
+from django.utils.timezone import now
+
+class CustomHistoricalRecords(HistoricalRecords):
+    """Custom historical records that properly handle generic relations."""
+    
+    def copy_fields(self, model):
+        """
+        Copy fields from the model to the historical record model,
+        excluding GenericRelation fields.
+        """
+        fields = {}
+        for field in model._meta.concrete_fields:
+            if not isinstance(field, GenericRelation) and field.name not in [
+                'comments', 'comment_threads', 'photos', 'reviews'
+            ]:
+                fields[field.name] = field.clone()
+        return fields
+
+    def create_history_model(self, model, inherited):
+        """
+        Override to ensure we don't create duplicate auto fields.
+        """
+        attrs = {
+            '__module__': model.__module__,
+            '_history_excluded_fields': ['comments', 'comment_threads', 'photos', 'reviews'],
+        }
+
+        app_module = '%s.models' % model._meta.app_label
+
+        if inherited:
+            # inherited use models.AutoField instead of models.IntegerField
+            attrs.update({
+                'id': models.AutoField(primary_key=True),
+                'history_id': models.AutoField(primary_key=True),
+                'history_date': models.DateTimeField(default=now),
+                'history_change_reason': models.CharField(max_length=100, null=True),
+                'history_type': models.CharField(max_length=1, choices=(
+                    ('+', 'Created'),
+                    ('~', 'Changed'),
+                    ('-', 'Deleted'),
+                )),
+                'history_user': models.ForeignKey(
+                    'accounts.User',
+                    null=True,
+                    on_delete=models.SET_NULL,
+                    related_name='+'
+                ),
+            })
+
+        # Convert field to point to historical model
+        fields = self.copy_fields(model)
+        attrs.update(fields)
+        
+        return type(
+            str('Historical%s' % model._meta.object_name),
+            (models.Model,),
+            attrs
+        )