Is it possible to configure the AvroValueDeserializer to set missing properties in TSchema to non-null defaults?

[devantler]

I have a consumer that consumes messages and deserialises them into a model that looks something like this:

public class Model {
 public Guid Id {get; set;} = Guid.Empty();
 public string Value1 {get; set;}
 public int Value2 {get; set;}
}

The schema contains all values but the Id, and as such the deserialiser creates the following object when consuming the message:

{
   "Id": null,
   "Value1": "someValue",
   "Value2": 2
}

Is it possible to configure the deserialiser to set the id to a non null value, or have it use the value on the model it is desearilizing too?

This is the code:

/// <inheritdoc />
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
    await Parallel.ForEachAsync(_consumers, stoppingToken, async (item, token) =>
    {
        var consumer = item.Item1;
        string topic = item.Item2;
        consumer.Subscribe(topic);
        while (!token.IsCancellationRequested)
        {
            var consumeResult = consumer.Consume(token);
            
            //It is this object that has its Id property value set to null and not its default value.
            var schema = consumeResult.Message.Value;

            if (schema is null)
                continue;

            _ = await _dataStoreService.CreateSingleAsync(schema, token);
        }
    });
}

And I expect something like this to be the value of my schema object:

{
   "Id": "00000000-0000-0000-0000-000000000000"
   "Value1": "someValue",
   "Value2": 2
}

[devantler]

Sorry for any confusion this might have caused. This is not an issue at all.

Default values on the object are correctly used, I just hadn't tested it properly as I assumed my issue after adding a default value to the object, was the same as before. I had some conflict on the default key serialised which was unrelated to the above.