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

history_tracking/historical_fields.py

@@ -0,0 +1,49 @@
+from django.db import models
+from django.conf import settings
+from django.contrib.contenttypes.fields import GenericRelation, GenericForeignKey
+from typing import List, Type
+
+def get_trackable_fields(model_class: Type[models.Model]) -> List[models.Field]:
+    """Get fields that should be tracked in history."""
+    if getattr(model_class, '_is_historical_model', False):
+        # For historical models, only return core history fields
+        return [
+            models.BigAutoField(name='id', primary_key=True),
+            models.DateTimeField(name='history_date'),
+            models.CharField(name='history_change_reason', max_length=100, null=True),
+            models.CharField(name='history_type', max_length=1),
+            models.ForeignKey(
+                to=settings.AUTH_USER_MODEL,
+                name='history_user',
+                null=True,
+                on_delete=models.SET_NULL
+            )
+        ]
+    
+    trackable_fields = []
+    excluded_fields = {
+        'comment_threads', 'comments', 'photos', 'reviews',
+        'thread', 'content_type', 'object_id', 'content_object'
+    }
+    
+    for field in model_class._meta.get_fields():
+        # Skip fields we don't want to track
+        if any([
+            isinstance(field, (GenericRelation, GenericForeignKey)),
+            field.name in excluded_fields,
+            field.is_relation and hasattr(field.remote_field.model, '_meta') and
+            'commentthread' in field.remote_field.model._meta.model_name.lower()
+        ]):
+            continue
+            
+        trackable_fields.append(field)
+    
+    return trackable_fields
+
+class HistoricalFieldsMixin:
+    """Mixin that controls which fields are copied to historical models."""
+    
+    @classmethod
+    def get_fields_to_track(cls) -> List[models.Field]:
+        """Get fields that should be tracked in history."""
+        return get_trackable_fields(cls)