product model and serializer update for varients

backend/product/admin.py

@@ -11,6 +11,15 @@ from unfold.widgets import (
 )
 from unfold.decorators import action, display
 
+@admin.register(ProductVariant)
+class ProductVariantAdmin(ModelAdmin, ImportExportModelAdmin):
+    import_form_class = ImportForm
+    export_form_class = ExportForm
+    autocomplete_fields = ['attributes']
+    warn_unsaved_form = True
+
+
+
 @admin.register(ProductDetailCategory)
 class ProductDetailCategoryAdmin(ModelAdmin, ImportExportModelAdmin):
     import_form_class = ImportForm
@@ -156,20 +165,22 @@ class ProductModelAdmin(ModelAdmin, ImportExportModelAdmin):
 
     @display(description='محصول', header=True)
     def display_image(self, instance):
-        if instance.image1:
-            return [
-                instance.name,
-                None,
-                None,
-                {
-                    "path": instance.image1.url,
-                    "height": 30,
-                    "width": 30,
-                    "borderless": True,
-                    # "squared": True,
-                },
-            ]
-        return ('خالی',)
+        if instance and instance.variants.first() and instance.variants.first().attributes.first():
+            image = instance.variants.first().attributes.first().image.url if instance.variants.first().attributes.first().image else None
+        else:
+            image = None
+        return [
+            instance.name,
+            None,
+            None,
+            {
+                "path": image,
+                "height": 30,
+                "width": 30,
+                "borderless": True,
+                # "squared": True,
+            },
+        ]
     # @display(
     #     description=("نمایش در صفحه ی اصلی"),
     #     label={