FieldValue

class

Sentinel values that can be used when writing documents with set() or update().

Methods

delete

static

delete() returns any type

Returns a sentinel used with update() to mark a field for deletion.

Returns

any type 

The sentinel value to use in your objects.

Example 

let documentRef = firestore.doc('col/doc');
let data = { a: 'b', c: 'd' };

documentRef.set(data).then(() => {
  return documentRef.update({a: Firestore.FieldValue.delete()});
}).then(() => {
  // Document now only contains { c: 'd' }
});

serverTimestamp

static

serverTimestamp() returns any type

Returns a sentinel used with set(), create() or update() to include a server-generated timestamp in the written data.

Returns

any type 

The sentinel value to use in your objects.

Example 

let documentRef = firestore.doc('col/doc');

documentRef.set({
  time: Firestore.FieldValue.serverTimestamp()
}).then(() => {
  return documentRef.get();
}).then(doc => {
  console.log(`Server time set to ${doc.get('time')}`);
});

isEqual

isEqual(other) returns boolean

Returns true if this FieldValue is equal to the provided value.

Parameter

other

any type

The value to compare against.
Returns

boolean 

true if this FieldValue is equal to the provided value.