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How to query normalized firestore database

Time:11-23

I have a Firestore Database that looks like this:

Root
    Accounts
            username: UID1
    Friends
            id: SOME_ID
            members: {UID1, UID2}

I display all the friends in a RecyclerView. But how can I use the username field in the Accounts collection to query the Friends List?

CodePudding user response:

With your current data model you'll have to load each friend's user profile separately based on their UID to get their username.

Alternatively you can change your data model to also include the user name for each member in the Friends document already. While this data duplication may seem unnatural if you come from a background in relational databases, it is really common in NoSQL databases - and one of the reasons they scale so well when reading data.

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