How to update an array within a map using Firestore functions?

Question

I have an array within a map that I want to update using Firestore Functions. My data structure looks like this:

In this case, I want to update the shareRecordsWith array within the {uid} map.

I have been trying to use the following firestore functions but it's not working.

const recordsDict = {"uid": aboutUID, "accessType": accessType}
profilesRef.doc(uid).set({
    [uid]: {
        {'shareRecordsWith': admin.firestore.FieldValue.arrayUnion(recordsDict)},
        {merge: true}
    }
});

Is there a way to update an array within a map through Firestore Functions?

EDIT: Based on the suggestions, I changed the function to

profilesRef.doc(uid).set({
    [`${uid}.shareRecordsWith`]: admin.firestore.FieldValue.arrayUnion(recordsDict)
}, { merge: true })

Unfortunately, then it adds ${uid}.shareRecordsWith as a new field in the document instead of adding to the shareRecordsWith array within the {uid} map.

This is what it looks like:

Doug Stevenson · Accepted Answer · 2020-08-01 19:59:55Z

1

You will need to call out the entire path of the nested field as a single property. You can do this by passing a FieldPath object with update(), but it doesn't look like set() supports this.

profilesRef.doc(uid).update(
    new admin.firestore.FieldPath(uid, "shareRecordsWith"),
    admin.firestore.FieldValue.arrayUnion(recordsDict)
})

edited Aug 1, 2020 at 19:59

answered Aug 1, 2020 at 17:55

Doug Stevenson

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3 Comments

ewang Over a year ago

Unfortunately, it's adding ${uid}.shareRecordsWith as a new field in the document instead of adding to the shareRecordsWith array within the {uid} map. I've edited and attached a screenshot in my original post.

Doug Stevenson Over a year ago

Looks like you will have to use update() with FieldPath.

ewang Over a year ago

Worked your solution after I took out the close bracket! Thank you so much!

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