Data modeling in Mongodb?

Question

MongoDB

Help me decide when creating a data model!
There are Groups of Students and N Tests.
Here is the first model when displaying the log of test results
, we also need to pull the necessary information from 2 collections (group and tests).

group{
groups:{
  users:{
    user1{a,b,c,...}
    user2{a,b,c,...}
    ....
  }
}

tests{
  name,
  questions:{
    question1{a,b,c,...}
    question2{a,b,c,...}
    ...
  }
}

logs{
  user.id,
  test.id,
  date,
  result
}

==========
2 structure
When using nesting, we can immediately write the necessary information to the result log. BUT if any user or test data changes, all affected documents will need to be updated.

groups:{
  users:{
    user1{a,b,c,...}
    user2{a,b,c,...}
    ....
  }
}

tests{
  name,
  questions:{
    question1{a,b,c,...}
    question2{a,b,c,...}
    ...
  }
}

logs{
  user{
    Name,
    Yaer,
    ...
  },
  test{
    Name,
    ...
  }
  date,
  result
}

Is there any optimal solution? Or offer your model.

Answer 1

BUT if any user or test data changes, all affected documents will need to be updated.

now you understand the beauty of schemaless.
Assume how much you will write and read, and balance between
Easier to read VS easier to write

Answer 2

BUT if any user or test data changes, all affected documents will need to be updated.

Because you are using a NoSQL database for relational data.
An error in the wrong choice of a DBMS for a specific task.

Answer 3

There is little information on how you will then use the data.
As an option: users in a separate collection with a link to a group (or a list of groups)