Added Id to assets.

src/Squidex.Domain.Apps.Entities/Assets/Edm/EdmAssetModel.cs

@@ -18,6 +18,7 @@ namespace Squidex.Domain.Apps.Entities.Assets.Edm
         {
             var entityType = new EdmEntityType("Squidex", "Asset");
 
+            entityType.AddStructuralProperty(nameof(IAssetEntity.Id).ToCamelCase(), EdmPrimitiveTypeKind.String);
             entityType.AddStructuralProperty(nameof(IAssetEntity.Created).ToCamelCase(), EdmPrimitiveTypeKind.DateTimeOffset);
             entityType.AddStructuralProperty(nameof(IAssetEntity.CreatedBy).ToCamelCase(), EdmPrimitiveTypeKind.String);
             entityType.AddStructuralProperty(nameof(IAssetEntity.LastModified).ToCamelCase(), EdmPrimitiveTypeKind.DateTimeOffset);