Firestore update all documents in collections

Question

I have a firestore collections named users, each users have a generated id with a field score :

users 
    0e8X3VFL56rHBxxgkYOW
        score : 4
    3SeDjr         


        

Answer 1

Batch updates are nice but bare in mind that they are limited to 500 document updates per transaction. If this reset isn't done often maybe simplest approach is:

async function resetScores() {
  const collection = await db
    .collection("users")
    .get()
  collection.forEach(doc=> {
    doc.ref
      .update({
        score: 0
      })
  })
}