CODEWITHSUNDEEP
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Spaeda
Spaeda

Reputation: 83

Array of string with Realm database .NET sdk

My Realm schema define a property as array of string. I add this property in my .NET model as a RealmList<string> but this is always an empty list. I also try with an IList<string> but I have a null value.

Someone already try to map a list of primitive instead of a list of EmbeddedObject or RealmObject?

My schema:

{
  "title": "simple",
  "bsonType": "object",
  "properties": {
    "_id": {
      "bsonType": "objectId"
    },
    "_partition": {
      "bsonType": "string"
    },
    "name": {
      "bsonType": "string"
    },
    "hashtags": {
      "bsonType": "array",
      "items": {
        "bsonType": "string"
      }
    }
  },
  "required": [
    "_id",
    "_partition",
    "name"
  ]
}

An example of data stored

{
    "_id": {
        "$oid": "6151a0eb49d3cbc1b3795579"
    },
    "_partition": "Part001",
    "name": "First obj",
    "hashtags": ["001", "0003"]
}

My .NET model:

[MapTo("simple")]
public class Simple : RealmObject
{
  [PrimaryKey]
  [MapTo("_id")]
  public ObjectId Id { get; set; } = ObjectId.GenerateNewId();

  [Required]
  [MapTo("_partition")]
  public string Partition { get; set; }

  [Required]
  [MapTo("name")]
  public string Name { get; set; }

  [MapTo("hashtags")]
  public RealmList<string> Hashtags { get; }
}

.NET code that load data

var app = App.Create("my-realm");

var user = await app.LogInAsync(Credentials.EmailPassword("", ""));

var configuration = new SyncConfiguration("Part001", user)
{
  ObjectClasses = new[] { typeof(Simple) }
};

var realm = await Realm.GetInstanceAsync(configuration);
await realm.GetSession().WaitForDownloadAsync();
await realm.GetSession().WaitForUploadAsync();

var simples = realm.All<Simple>().ToList();

Upvotes: 0

Views: 492

Answers (1)

Spaeda
Spaeda

Reputation: 83

I resolved it to use IList and ISet when I use an unique constraint for array.

[MapTo("simple")]
public class Simple : RealmObject
{
  [PrimaryKey]
  [MapTo("_id")]
  public ObjectId Id { get; set; } = ObjectId.GenerateNewId();

  [Required]
  [MapTo("_partition")]
  public string Partition { get; set; }

  [Required]
  [MapTo("name")]
  public string Name { get; set; }

  [MapTo("hashtags")]
  public IList<string> Hashtags { get; }

  // If I use "uniqueItems": true in my schema
  // "hashtags": {
  //  "bsonType": "array",
  //  "uniqueItems": true,
  //  "items": {
  //    "bsonType": "string"
  //  }
  // }
  // [Required]
  // [MapTo("hashtags")]
  // public ISet<string> Hashtags { get; }
}

Upvotes: 2

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