Using var in js for cloud firestore

Question

I am using this js code:

var grade_type = document.getElementById("grade_type").value;

gradesRef.set({
          grade_type: firebase.firestore.FieldValue.arrayUnion(grade)
        });

But in my cloud firestore the field is going to be named with: 'grade_type'. But I want to name the field like the value of grade_type.
How to do that?

score 2 · Accepted Answer · answered Nov 18 '18 at 19:29

2

gradesRef.set({
      [grade_type]: firebase.firestore.FieldValue.arrayUnion(grade)
    });

answered Nov 18 '18 at 19:29

MrAleister

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score 0 · Answer 2 · answered Nov 18 '18 at 19:31

This is not firebase related, you are just looking for a way to write an object literal with variable key in NodeJS. There are plenty of articles explaining that, including this one.

@MrAleister's answer seems to be the easiest one {[variable_name]: value}

score 0 · Answer 3 · answered Nov 18 '18 at 19:31

0

You can set the name of a property with the value of a variable in JavaScript like this:

const fields = {}
fields[grade_type] = firebase.firestore.FieldValue.arrayUnion(grade)

Then pass the object to Firestore:

gradesRef.set(fields)

answered Nov 18 '18 at 19:31

Doug Stevenson

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Using var in js for cloud firestore

3 Answers3