HOW can I join two collections in Meteor 3.1.2?

help
1

I am trying to join two collections, as I use referenced fields.

2

I guess it’s a new feature in MongoDB v8, Meteor provides raw collection which might work: Collections | Docs

3

There are many ways to do this. The question what is the desired output.
You can use publish-composite if you just want the related documents published to client.
You can manually join them together after retrieving, or better use an aggregation.
There are a few more, but without specific example it is hard to say what it the correct approach.