Examples with DocumentReference com.google.cloud.firestore.DocumentReference used on opensource projects

Example 26 with DocumentReference

use of com.google.cloud.firestore.DocumentReference in project java-docs-samples by GoogleCloudPlatform.

the class ManageDataSnippets method updateServerTimestamp.

/**
 * Update document with server timestamp.
 */
void updateServerTimestamp() throws Exception {
    db.collection("objects").document("some-id").set(new HashMap<String, Object>()).get();
    // [START fs_update_server_timestamp]
    DocumentReference docRef = db.collection("objects").document("some-id");
    // Update the timestamp field with the value from the server
    ApiFuture<WriteResult> writeResult = docRef.update("timestamp", FieldValue.serverTimestamp());
    System.out.println("Update time : " + writeResult.get());
// [END fs_update_server_timestamp]
}