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  • Create a Realm Object
  • Upsert a Realm Object

When creating or updating documents, all writes must happen in a transaction.

The following code shows two methods for creating a new Realm object. In the first example, we create the object first, and then add it to the realm within a WriteAsync() method. In the second example, we create the document within the WriteAsync block, which returns a realm object we can further work with.

var testItem = new Item
{
Name = "Do this thing",
Status = ItemStatus.Open.ToString(),
Assignee = "Aimee"
};
await realm.WriteAsync(() =>
{
realm.Add(testItem);
});
// Or
var testItem2 =
await realm.WriteAsync(() =>
{
return realm.Add<Item>(new Item
{
Name = "Do this thing, too",
Status = ItemStatus.InProgress.ToString(),
Assignee = "Satya"
});
}
);

Upserting a document is the same as creating a new one, except you set the optional update parameter to true. In this example, we create a new Item object with a unique Id. We then insert an item with the same id but a different Name value. Because we have set the update parameter to true, the existing record is updated with the new name.

var id = ObjectId.GenerateNewId();
var item1 = new Item
{
Id = id,
Name = "Defibrillate the Master Oscillator",
Assignee = "Aimee"
};
// Add a new person to the realm. Since nobody with the existing Id
// has been added yet, this person is added.
await realm.WriteAsync(() =>
{
realm.Add(item1, update: true);
});
var item2 = new Item
{
Id = id,
Name = "Fluxify the Turbo Encabulator",
Assignee = "Aimee"
};
// Based on the unique Id field, we have an existing person,
// but with a different name. When `update` is true, you overwrite
// the original entry.
await realm.WriteAsync(() =>
{
realm.Add(item2, update: true);
});
// item1 now has a Name of "Fluxify the Turbo Encabulator"
// and item2 was not added as a new Item in the collection.
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