How To Update Fields In Firestore Map

Don't know how to go about adding new fields into a map in Firestore using a variable rather then a hardcoded field name. I have a data structure in firestorm. The collection is ca

Solution 1:

You'll need to use the full field path as the key of the update:

var setWithMerge = cityRef.set({
  `people.${x}`: y
});

This will prevent re-writing the entire "people" field, since you are specifying which property of the map to change directly.

Note that the field name and the property name are separated by a period.