What happened?

In conforming to c# 9 nullability, realm models using one-to-many relationships need a value assigned to their get-only list properties to make the compiler happy. My initial approach was to initialise these with a new list:

    public class RealmBeatmapSet : RealmObject
    {
        public Guid ID { get; set; } = Guid.NewGuid();

        public IList<RealmBeatmap> Beatmaps { get; } = new List<RealmBeatmap>();
    }

As it turns out, doing this means even though storing a newly created model works as expected, retrieving an existing object from a realm instance will never show any relations. The fix is easy enough - suppressing null and leaving it to the underlying realm initialisation to make the empty lists works as expected:

    public class RealmBeatmapSet : RealmObject
    {
        public Guid ID { get; set; } = Guid.NewGuid();

        public IList<RealmBeatmap> Beatmaps { get; } = null!;
    }

But this does feel like an easy slip-up to make as a user, and there is no errors or warning as to what is going on.

Repro steps

• Initialise an {{IList<T> x {get;}

  }} with a construction-time value

• Attempt to access a nested object via this relation

Version

10.5.0

What SDK flavour are you using?

Local Database only

What type of application is this?

Console/Server

Client OS and version

macOS 12

Code snippets

No response

Stacktrace of the exception/crash you're getting

No response

Relevant log output

No response