Update order when deleting bundle (#1114)

bookmarks/services/bundles.py

@@ -0,0 +1,37 @@
+from django.db.models import Max
+
+from bookmarks.models import BookmarkBundle, User
+
+
+def create_bundle(bundle: BookmarkBundle, current_user: User):
+    bundle.owner = current_user
+    if bundle.order is None:
+        max_order_result = BookmarkBundle.objects.filter(owner=current_user).aggregate(
+            Max("order", default=-1)
+        )
+        bundle.order = max_order_result["order__max"] + 1
+    bundle.save()
+    return bundle
+
+
+def move_bundle(bundle_to_move: BookmarkBundle, new_order: int):
+    user_bundles = list(
+        BookmarkBundle.objects.filter(owner=bundle_to_move.owner).order_by("order")
+    )
+
+    if new_order != user_bundles.index(bundle_to_move):
+        user_bundles.remove(bundle_to_move)
+        user_bundles.insert(new_order, bundle_to_move)
+        for bundle_index, bundle in enumerate(user_bundles):
+            bundle.order = bundle_index
+
+        BookmarkBundle.objects.bulk_update(user_bundles, ["order"])
+
+
+def delete_bundle(bundle: BookmarkBundle):
+    bundle.delete()
+
+    user_bundles = BookmarkBundle.objects.filter(owner=bundle.owner).order_by("order")
+    for index, user_bundle in enumerate(user_bundles):
+        user_bundle.order = index
+    BookmarkBundle.objects.bulk_update(user_bundles, ["order"])