Ketan Agwan’s Post

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Software Developer @ RUDISN | React Js | Node Js | Next Js | MongoDB

I recently worked on implementing a functionality similar to YouTube, where, upon visiting a channel, we can retrieve its subscribers, the channels it’s subscribed to, and whether the logged-in user is already subscribed to the channel—all in a single query using MongoDB aggregation pipelines. 1. $match: Filters the data to get only what you need. 2. $lookup: Joins collections, just like SQL joins but more flexible! 3. $addFields: Creates or computes new fields dynamically. 4. $project: Shapes the final output to include only relevant fields. Using these stages, I built a pipeline to fetch user profiles, count their subscribers, the channels they’ve subscribed to, and check if a logged-in user follows them or not—all in a single query! MongoDB aggregation pipelines are not just efficient—they’re fun to work with. If you’re learning MongoDB, I highly recommend diving into aggregation pipelines. its really interesting to learn! Have you tried aggregation pipelines before? Let me know your thoughts! #javascript #MongoDB #backend

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