How do I exclude already-swiped users in a feed?
Fetch the swiped user IDs with ConnectionRequest.find({ fromUserId }).distinct('toUserId'). Then filter the feed with _id: { $nin: [req.user.userId, ...swipedIds] }. Excludes the current user and anyone already swiped on.
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More FAQs in How to Build a Feed API in Node.js
GET /feed?skip=&limit=. Exclude the current user and already-swiped users. Cap the limit. Use .lean() and .select(). Return total. Run find and countDocuments in parallel with Promise.all. Index the filter fields.
To prevent abuse. Without a cap, a client can request 10000 items, eating memory and bandwidth. Use Math.min(parseInt(req.query.limit) || 20, 100). Most UIs only show 20 at a time anyway.
So the client can show 'showing 1-20 of 432' and decide whether to show a next button. Use Promise.all([find, countDocuments]) to run both queries in parallel and avoid waterfall delays.
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