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Sync Data

Note

Realm Sync is currently in Beta.

Prerequisites

Before you can access a synced realm from the client, you must:

Open a Synced Realm

To open a synced realm, call the GetInstanceAsync() method, passing in a SyncConfiguration object that includes the partition name and the user. The following code demonstrates this:

config = new SyncConfiguration("myPartition", user);
var realm = await Realm.GetInstanceAsync(config);

In the above example, the code shows how to open the realm asynchronously by calling GetInstanceAsync(). You can also open a realm synchronously by calling the GetInstance() method, which is necessary if the device is offline.

var synchronousRealm = Realm.GetInstance(config);

Note

The first time a user logs on to your realm app, you should open the realm asynchronously to sync data from the server to the device. After that initial connection, you can open a realm synchronously to ensure the app works in an offline state.

The partition value specifies which subset of your data to sync. This is typically a user ID, project ID, store ID, or some other category identifier in your app that has particular relevance to the current user.

Sync Data

The syntax to read and write on a synced realm is identical to the syntax for non-synced realms. While you work with local data, a background thread efficiently integrates, uploads, and downloads changesets.

When Using Sync, Avoid Writes on the Main Thread

The fact that Realm performs sync integrations on a background thread means that if you write to your realm on the main thread, there’s a small chance your UI could appear to hang as it waits for the background sync thread to finish a write transaction. Therefore, it’s a best practice never to write on the main thread when using Realm Sync.

The following code creates a new Task object and writes it to the realm:

var testTask = new Task
{
    Name = "Do this thing",
    Status = TaskStatus.Open.ToString()
};

realm.Write(() =>
{
    realm.Add(testTask);
});

See also

Threading

Summary

  • Open a synced realm with the configuration object generated when you pass a partition value to the user object’s SyncConfiguration Builder.
  • Compared to using a non-synced realm, there is no special syntax for reading from, writing to, or observing objects on a synced realm.
  • You should avoid writing to a synced realm on the main thread.