add preview_image field to blog_ext post admin view

blog_ext/admin.py

@@ -23,6 +23,22 @@ from blog_ext.models import Post, Section, ImageSet
 class PostAdmin(BasePostAdmin):
     form = AdminPostForm
 
+    fields = [
+        "section",
+        "title",
+        "preview_image",
+        "slug",
+        "author",
+        "markup",
+        "teaser",
+        "content",
+        "description",
+        "sharable_url",
+        "state",
+        "published",
+        # "image_set"  # maybe this https://github.com/anziem/django_reverse_admin
+    ]
+
     def formfield_for_dbfield(self, db_field, **kwargs):
         if db_field.name in ['content', 'teaser', 'description']:
             kwargs['widget'] = CKEditorUploadingWidget(