update method

Transaction update(DocumentReference documentRef, JSObject data, [ Precondition precondition ])

Updates fields in the document referred to by the provided DocumentReference. The update will fail if applied to a document that does not exist.

Nested fields can be updated by providing dot-separated field path strings.

@param documentRef A reference to the document to be updated. @param data An object containing the fields and values with which to update the document. @param precondition A Precondition to enforce on this update. @throws Error If the provided input is not valid Firestore data. @return This Transaction instance. Used for chaining method calls.

Implementation

external Transaction update(
  DocumentReference documentRef,
  JSObject data, [
  Precondition precondition,
]);