mongoplayground VS wps-playground

I'd like to see a couple examples before commenting on specific implementations. Checkout https://mongoplayground.net

In my "docs" collection I am storing all the docs, but some of them are parents of another doc. This is one layer deep. I created a test query on the mongo db playground and it works as I wanted to but not the same in my code. Here is what I have in the https://mongoplayground.net/:

I've always found the mongo documentation to be helpful and in good order. As far as collaborating on reddit, I've found mongoplayground.net to be an absolute godsend. I think it would be a huge win for Mongo to implement a similar sandbox with broader support (updates/deletes/inserts). I'd imagine it not to be too difficult to load up shared data and queries that run against one's free tier cluster to limit abuse. The ability to collaborate on an idea with actual executing code provides a lot of value towards increased market share. In addition, the need to run against one's own cluster should increase user accounts, which I'm sure shareholders would love to see.

Could you provide an example of collection ( better using https://mongoplayground.net) and desired result ?

Throw some data into mongoplayground.net and share a link - does your photos collection not have 12 records with the same modeles?

db.testA.aggregate([ { $lookup: { from: "testB", localField: "_id", foreignField: "aId", as: "join" } }, { $addFields: { isFound: { "$function": { // you can remove the enclose quotation in function // this is a bug with mongoplayground // https://github.com/feliixx/mongoplayground/issues/22 "body": "function(a) {return a.length > 0}", args: [ "$join" ], lang: "js" } } } }, { "$project": { isFound: 1 } } ])