MongoDB收集架构

Question

I'm a 1 day beginner in MongoDB and I try to not think the classic relational way, which seems pretty harder in the implementation than what I thought.

what I want to achieve is a simple database containing 2 collections : User - Interest

a user might have many interests.

this is what I have now :

User :

{
    _id: 'user1',
    language: 'EN', 
    firstName: 'Mehdi',
    interests: [
        interest1, 
        interest2, 
        interest3
    ]
}

Interest :

{
    _id: 'interest1',
    name: 'Mobile'
}

So I'm a little bit confused here,

should I store first store Interest documents in the Interest Collection then retrieve them as Objects and store them as Binary Objects in User documents ? so I will have something like : Create Interest Documents --> Retrieve them --> create Users document and Store the interests on it ?

Or should I simply nest Interest documents in the User document without create them before. so I will have something like : Create User Documents and create/nest Interests document on it ?

Thank you.

Answer 1

I dont know your exact requirements, but I would probably use just the "users" collection, and embed interests the way you have.

If you want a list of all the different interests, you can try:

db.users.distinct("interests");