Add drag-and-drop reorder within same column

[anoopcodehack]

Right now tasks can be dragged between columns but
reordering within the same column doesn't save to DB.
Fix: call updateTask with new order value on drag end.

[vivek-devda]

Hi! I'd like to work on this issue.

I've been reviewing the drag-and-drop flow and task ordering logic. I noticed tasks are fetched sorted by the order field, but onDragEnd() currently only updates the task status and does not persist the new order when reordering within a column.

I'll investigate further and submit a PR if the issue is reproducible.

[vivek-devda]

I tested updating order on drag end and confirmed the request is sent. However, tasks within a column still share duplicate order values (e.g. A=0, B=0, C=0), so sorting by order alone does not fully resolve reordering. It appears the column may need reindexing after a drag operation so all tasks receive unique order values.

[vivek-devda]

I tested the proposed fix by updating onDragEnd() to send:

await updateTask(draggableId, {
  status: destination.droppableId,
  order: destination.index,
});

and verified via Network requests that order is being sent to the backend.

I also tested rendering with:

tasks
  .filter((t) => t.status === status)
  .sort((a, b) => a.order - b.order);

This changes the behavior, but the issue is not fully resolved because tasks within a column still end up sharing duplicate order values (e.g. A=0, B=0, C=0).

It looks like reordering may require reindexing the affected column so all tasks receive unique order values after a drag operation.

Would you prefer a minimal fix that only persists the dragged task's order, or should the solution update the ordering of all affected tasks in the column?

[anoopcodehack]

Hey, great investigation! 🔥 Yes go with the full reindex approach — update all tasks in the column with unique order values after every drag. That's the correct fix.

Something like this:

const onDragEnd = async (result) => {
  const { destination, source, draggableId } = result;
  if (!destination) return;

  const colTasks = getTasksByStatus(destination.droppableId);
  const reordered = Array.from(colTasks);
  const [moved] = reordered.splice(source.index, 1);
  reordered.splice(destination.index, 0, moved);

  // update order for every task in the column
  await Promise.all(
    reordered.map((task, index) =>
      updateTask(task._id, { status: destination.droppableId, order: index })
    )
  );
};

Feel free to open the PR when ready — happy to review! 🙌

[vivek-devda]

Thanks for the guidance and quick review! I learned a lot while investigating and fixing this issue. Really appreciate the feedback and the opportunity to contribute. 🚀

[anoopcodehack]

That's what open source is all about! 🙌 Really glad you learned something from it.

Once you open the PR I'll review and merge it ASAP. And hey — there are plenty more issues open if you ever want to pick up another one. Always happy to have you contributing! ⭐

[vivek-devda]

Just for clarification, if I am Correct, you have already merged it . I had received an email earlier "Merged #32 into main"

…

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