Update nested variable field in firestore

Question

Suppouse a firestore Database filled with this structure, being Events and Users collections:

Firestore
    -Events
        -1612483200
            -peopleSignedDict
                -Alex
                    -state: 1
                -Mark:
                    -state: 0
        -1606172400
            -peopleSignedDict                
    -Users
        -1zyXSMMlGiaUusUNLQWAxfsI4pM2
            -name: Alex
        -4zyXSMMlGiaUusUNLQWAxfsI4pM2
            -name: Mark

I'm using Node.js and trying to update Events.1612483200.peopleSignedDict.Alex.state to change the state from 1 to 0. To achieve it I'm trying to do:

var randomName = getRandomDBName();
db.collection('Events').doc('1612483200').set({
            'peopleSignedDict.'+randomName+'.state': 0
        });

But ofc my IDE (PhpStorm) yells at me telling that this syntax is not valid, which should be the correct syntax to approach this?

Frank van Puffelen · Accepted Answer · 2021-01-11 15:27:22Z

2

There's a few way to do this.

My favorite is to first construct the key in a separate variable, and then use that in the collection:

let randomName = getRandomDBName();
let updates = {};
updates['peopleSignedDict.'+randomName+'.state'] = 0;
db.collection('Events').doc('1612483200').update(updates);

But a common (and shorter) alternative is:

let randomName = getRandomDBName();
db.collection('Events').doc('1612483200').update({ 
  [`peopleSignedDict.${randomName}.state`]: 0;
});

I'm actually not sure if the [] are needed in that last snippet, so if you have problems with it, try it without them and let me know.

edited Jan 11, 2021 at 15:27

answered Jan 10, 2021 at 1:10

Frank van Puffelen

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2 Comments

Lotan Over a year ago

Thanks @Frank, you're the firebase-man to me! I've tested and without the [ ] won't work, it also works with [ ] and + instead of using $. But one question before accepting the answer, this currently creates a field called peopleSignedDict.Name.state instead of updating the value inside the Map, is the espected behaviour? Feels like this should be done using "update", instead of "set" maybe? Thanks again! ^^

Frank van Puffelen Over a year ago

Good catch. This should indeed have been an update call. I fixed it in my answer.

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