I used to have a document with the following structure:

OldDoc:

members: ['userId1', 'userId2', 'userId3']

I then wrote a query to retrieve all documents relevant to a user:

const docsSnapshot = await getDocs(query(
    collection(db, 'organisations'),
    where('members', 'array-contains', user.uid)
))

This worked well, but now I need to store the user's names in as well as:

members: [{ id: 'userId1', name: 'John Smith' }, { id: 'userId2', name: 'Jane Smith' }]

The challenge I'm facing is that I'm not sure how to construct a query that would yield the same results as the first one - i.e., how do I retrieve all docs where any of the objects have an id attribute corresponding to user.uid.

I tried using: where('members.id', '==', user.uid) but that didn't work.

Can a query be constructed to do this?

CodePudding user response：

Firestore isn't great at these kinds of queries... I'd consider restructuring your member array to be an object with user.id as keys.

members : {
   userId1: { name: "fred" },
   userId2: { name: "martha" }
}

Another way, and perhaps more closely aligned to how Firestore 'wants' you to do it, would be to create another subcollection members with a new document for each member with the doc.id set to the user.id.

This approach also allows you to easily add more data to each member, with the added benefit of making queries on members that don't just rely on the user.id.