Node.js Firestore Query Select List of field paths

Question

I try to create and returns a new Query instance that applies a field mask to the result and returns only the specified subset of fields.

When i use :

let query = firestore.collection('col').select('field1','field2','field3').get() ...

it's ok, the query returns all the collection documents with only the 3 specified fields.

In my context application, the specified fields list is on a configuration document. When i use :

let fieldsList = ['field1','field2','field3'];    
let query = firestore.collection('col').select(fieldsList).get() ...

i have an error message "Argument at index 0 is not a valid FieldPath ..."

On the Google documentation , it is specified " You can specify a list of field paths to return "

So, i don't know how to pass a list of field paths to the query select method.

Many thanks for your help !!!

Answer 1

You are working on what is known as spread syntax . To make it work, it need to add triple dots in front of fieldList :

let query = firestore.collection('col').select(...fieldsList).get() ..