Bit of a design question, hope you can provide some guidance:

I'm writing an internal wiki-like web application, and one of the use-cases is to comment on a document.

Domain model is simple:
a Comment class with text, date, and a collection of child comments.

My first implementation stores the comment tree in a single document, since it is very easy to serialize and deserialize, and the comment tree itself can be thought of as a holistic "document".

This works great, but now running into an issue on how to best support revision conflicts when multiple people are commenting at the same time.

If I were to keep the tree stored in a single document, I would have to load the two conflicting versions in code, manually combine the trees, and then save a new version, correct?

From a storage-perspective, it seems it would be simpler then to store each comment as its own document, with a "foreign key" of sorts pointing to a parent comment, which would be much less likely to have conflicts.

But then it seems I'm forcing a relational model into a document-based DB.

Any thoughts on this?

Thanks,
Z


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