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Custom User Data - Android SDK

On this page

  • Read a User’s Custom Data
  • Create a User’s Custom Data Document
  • Update a User’s Custom Data

You can read arbitrary data about your application users, known as custom user data, directly within your Android application. For example, you might store a user's preferred language, date of birth, or local timezone. To learn more about custom user data, see Enable Custom User Data.

Note

To use custom user data, you must first Enable Custom User Data.

You can read the custom user data of a currently logged in user through that user's User object. You cannot edit custom user data through a User object. To edit custom user data, see Update Custom User Data. To access the data, call the User.customData() method on the User object of a logged in user:

Warning
Custom Data May Be Stale

MongoDB Realm does not dynamically update the value of User.customData() immediately when underlying data changes. Instead, MongoDB Realm fetches the most recent version of custom user data whenever a user refreshes their access token, which occurs during most SDK operations that contact the MongoDB Realm back end. Realm refreshes access tokens every 30 minutes, so custom user data can be stale for no more than 30 minutes.

Note

If you require the most recent version of custom user data, use the User.refreshCustomData() method to request the latest version of a user's custom data.

To create, update, or delete custom user data, you will need the following information from your custom user data configuration:

Tip

You can find this information in the Realm UI on the App Users page under the Custom User Data tab.

To create custom user data for a user, create a MongoDB document in the custom user data collection. The user ID field of the document should contain the the user's user ID. The following example uses MongoDB Data Access to insert a document containing the user ID of the currently logged in user and a favoriteColor value into the custom user data collection:

You can add any number of arbitrary fields and values to the custom user data document when you create it. The user ID field is the only requirement for the document to become available on the User object as custom user data.

You can update custom user data using MongoDB Data Access, Realm Sync, MongoDB Compass, or the MongoDB Atlas Data Explorer.

To update a user's custom user data with MongoDB Data Access, edit the MongoDB document whose user ID field contains the user ID of the user. The following example uses MongoDB Data Access to update the favoriteColor field of the the document containing the user ID of the currently logged in user in the custom user data collection:

Tip

To determine a user's ID, access the User.id property or find the user in the Realm UI on the App Users page under the Users tab.

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On this page

  • Read a User’s Custom Data
  • Create a User’s Custom Data Document
  • Update a User’s Custom Data