Key with ancestors

Make a key with ancestors.

Explore further

For detailed documentation that includes this code sample, see the following:

• Entities, Properties, and Keys

Code sample

C#

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode C# API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

Key rootKey = _db.CreateKeyFactory("User").CreateKey("Alice");
Key taskListKey = new KeyFactory(rootKey, "TaskList").CreateKey("default");
Key key = new KeyFactory(taskListKey, "Task").CreateKey("sampleTask");

Go

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode Go API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

userKey := datastore.NameKey("User", "alice", nil)
parentKey := datastore.NameKey("TaskList", "default", userKey)
taskKey := datastore.NameKey("Task", "sampleTask", parentKey)

Java

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode Java API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

KeyFactory keyFactory =
    datastore
        .newKeyFactory()
        .addAncestors(PathElement.of("User", "Alice"), PathElement.of("TaskList", "default"))
        .setKind("Task");
Key taskKey = keyFactory.newKey("sampleTask");

Node.js

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode Node.js API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

const taskKey = datastore.key([
  'User',
  'alice',
  'TaskList',
  'default',
  'Task',
  'sampleTask',
]);

PHP

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode PHP API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

$taskKey = $datastore->key('User', 'alice')
    ->pathElement('TaskList', 'default')
    ->pathElement('Task', 'sampleTask');

Python

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode Python API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from google.cloud import datastore

# For help authenticating your client, visit
# https://cloud.google.com/docs/authentication/getting-started
client = datastore.Client()

key = client.key("User", "alice", "TaskList", "default", "Task", "sampleTask")

Ruby

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode Ruby API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

# user_name = "alice"
# task_list_name = "default"
# task_name = "sampleTask"
task_key = datastore.key([
                           ["User", user_name],
                           ["TaskList", task_list_name],
                           ["Task", task_name]
                         ])

What's next

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