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Access Custom User Data

You can read arbitrary data about your application users, known as custom user data, directly within your ios 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.

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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 read the data, access the customData property on the User object of a logged in user:

let appId = YOUR_REALM_APP_ID // replace this with your App ID
let app = App(id: appId)
app.login(credentials: Credentials.anonymous) { (result) in
switch result {
case .failure(let error):
print("Failed to log in: \(error.localizedDescription)")
case .success(let user):
// If the user data has been refreshed recently, you can access the
// custom user data directly on the user object
print("User custom data: \(user.customData)")
// Refresh the custom user data
user.refreshCustomData { (result) in
switch result {
case .failure(let error):
print("Failed to refresh custom data: \(error.localizedDescription)")
case .success(let customData):
// favoriteColor was set on the custom data.
print("Favorite color: \(customData["favoriteColor"] ?? "not set")")
return
}
}
}
}
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Custom Data May Be Stale

MongoDB Realm does not dynamically update the value of the client-side user custom data document 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 is used by 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.

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If you require the most recent version of custom user data, use the refreshCustomDataWithCompletion 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 app's custom user data configuration:

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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:

let appId = YOUR_REALM_APP_ID // replace this with your App ID
let app = App(id: appId)
app.login(credentials: Credentials.anonymous) { (result) in
switch result {
case .failure(let error):
print("Failed to log in: \(error.localizedDescription)")
case .success(let user):
let client = user.mongoClient("mongodb-atlas")
let database = client.database(named: "my_database")
let collection = database.collection(withName: "users")
// Insert the custom user data object
collection.insertOne([
"userId": AnyBSON(user.id),
"favoriteColor": "pink"
]) { (result) in
switch result {
case .failure(let error):
print("Failed to insert document: \(error.localizedDescription)")
case .success(let newObjectId):
print("Inserted custom user data document with object ID: \(newObjectId)")
}
}
}
}

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:

let appId = YOUR_REALM_APP_ID // replace this with your App ID
let app = App(id: appId)
app.login(credentials: Credentials.anonymous) { (result) in
switch result {
case .failure(let error):
print("Failed to log in: \(error.localizedDescription)")
case .success(let user):
// Access the custom user document remotely to update it.
let client = user.mongoClient("mongodb-atlas")
let database = client.database(named: "my_database")
let collection = database.collection(withName: "users")
collection.updateOneDocument(
filter: ["userId": AnyBSON(user.id)],
update: ["favoriteColor": "cerulean"]
) { (result) in
switch result {
case .failure(let error):
print("Failed to update: \(error.localizedDescription)")
return
case .success(let updateResult):
// User document updated.
print("Matched: \(updateResult.matchedCount), updated: \(updateResult.modifiedCount)")
}
}
}
}
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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.

  • You can use custom user data to store arbitrary information about your application users.
  • MongoDB Realm stores custom user data as a document in a MongoDB collection determined by your application configuration.
  • MongoDB Realm associates custom user data with a user based on the value of the user ID field.
  • The custom user data field of the user object is read-only. You can modify custom user data using MongoDB Data Access or Sync.
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