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

media/admin.py

@@ -1,19 +1,28 @@
 from django.contrib import admin
-from django.utils.html import format_html
+from django.contrib.contenttypes.admin import GenericStackedInline
 from .models import Photo
 
+class PhotoInline(GenericStackedInline):
+    """Inline admin for photos that can be added to any model."""
+    model = Photo
+    extra = 1
+    fields = ('image', 'caption', 'alt_text', 'is_primary')
+    classes = ('collapse',)
+    
 @admin.register(Photo)
 class PhotoAdmin(admin.ModelAdmin):
-    list_display = ('thumbnail_preview', 'content_type', 'content_object', 'caption', 'is_primary', 'created_at')
-    list_filter = ('content_type', 'is_primary', 'created_at')
+    list_display = ('caption', 'content_type', 'object_id', 'is_primary', 'created_at')
+    list_filter = ('content_type', 'created_at', 'is_primary', 'is_approved')
     search_fields = ('caption', 'alt_text')
-    readonly_fields = ('thumbnail_preview',)
+    ordering = ('content_type', 'object_id', '-is_primary')
+    readonly_fields = ('created_at', 'updated_at')
     
-    def thumbnail_preview(self, obj):
-        if obj.image:
-            return format_html(
-                '<img src="{}" style="max-height: 50px; max-width: 100px;" />',
-                obj.image.url
-            )
-        return "No image"
-    thumbnail_preview.short_description = 'Thumbnail'
+    fieldsets = (
+        ('Image', {
+            'fields': ('image', 'caption', 'alt_text', 'is_primary', 'is_approved')
+        }),
+        ('Metadata', {
+            'fields': ('content_type', 'object_id', 'created_at', 'updated_at'),
+            'classes': ('collapse',)
+        }),
+    )

media/mixins.py

@@ -0,0 +1,19 @@
+from django.contrib.contenttypes.models import ContentType
+from django.db.models import QuerySet
+
+class PhotoableModel:
+    """Mixin for models that can have photos attached."""
+
+    def get_photos(self) -> QuerySet:
+        """Get photos for this instance."""
+        from media.models import Photo
+        ct = ContentType.objects.get_for_model(self.__class__)
+        return Photo.objects.filter(content_type=ct, object_id=self.pk)
+
+    def add_photo(self, photo: 'Photo') -> None:
+        """Add a photo to this instance."""
+        from media.models import Photo
+        ct = ContentType.objects.get_for_model(self.__class__)
+        photo.content_type = ct
+        photo.object_id = self.pk
+        photo.save()