How to search nested documents in Mongoose?

Question

MongoDB

Hello.
I am learning to use nodejs, mongoDB, mongoose, for the time being - solely in order to broaden my horizons.
Decided to try nested documents and ran into a problem.
There is a user object, which has a lot of static fields, methods, and a data field, which is an array of nested documents. In the data array, it is planned to store all information about user actions in general - page views, links to downloaded files, comments, messages, etc. In general, the data field will consist of thousands, tens of thousands of documents for each user document.
The question arises: how to select the necessary documents from the data field for a specific user (for example, all documents that have a 'type': 'message' field)?
From the absence in the mongoose manuals of a normal description of searching through nested documents (with the exception of searching by id), I got the impression that nested documents were not made for this use at all. Tell me, the method proposed above is really inefficient?
And in case this is inefficient, I will need to create a collection for each user containing the current data object. Can you tell me how to do this using mongoose?

Answer 1

For nested documents, dot notation works, db.base.find({ date.type : "someType" }).
To search through nested arrays, there is the $elemMatch operator ( docs.mongodb.org/manual/reference/operator/query/e...
And of course, all this can be nested and combined to get the desired result.