The answer
For lists with many relationships, fetch parents and referenced docs in parallel, return both, let the client connect them. Avoids N+1 and avoids large nested payloads. Example: { posts: [...], authors: [...] }.
Writing APIs With Relationships in MongoDB
What is side-loading in MongoDB APIs?
More FAQs in Writing APIs With Relationships in MongoDB
Use populate on read: Post.findById(id).populate('authorId', 'firstName lastName'). Returns the post with the author object embedded. The client gets everything in one response. Always select specific fields.
When deleting a user, delete their posts and messages too. Use deleteMany for each related collection, then delete the user. Do it in a transaction if your MongoDB supports it, so a failure rolls back.
For high-traffic reads of rarely-changing data. Store the sender's name on the message so you do not need to populate. When the user's name changes, update their messages (or accept staleness for a while).
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