Multi depth unflattening + MapProperty

[burnmw1987]

First off, disclaimer - I don't fully understand the MapProperty syntax. The basic examples make sense, but when expanded to a complex scenario I don't understand. Specifically if using the square bracket notation I'm not sure what it is expecting. Therefore, this lack of understanding might be my problem...

What I have is a flat C# object, which I want to unflatten over a multi depth JSON:API spec payload.

This is my flattened object:

public class JObject {
    public string Id { get; set; }
    public string Type { get; set; }
    public string UserId { get; set; }
}

And my unflattened JSON:API spec payload that I want to map the above flattened object over:

public class JObjectPayload
{
    public JObjectData data { get; set; } = new();
}

public class BaseData
{
    public string id { get; set; }
    public string type { get; set; }
}

public class JObjectData : BaseData
{
    public JObjectRelationships relationships { get; set; } = new();
}

public class JObjectRelationships
{
    public BaseData user { get; set; } = new();
}

Below is an example of the flattened object:

JOBject{
    Id = "1",
    Type = "person",
    UserId = "1234"
}

And the unflattened JSON:API spec object I am attempting to create:

data{
    id = "1",
    type = "person",
    relationships{
        user{
            id = "1234"
        }
    }
}

This is my attempt at unflattening it with Mapperly:

[MapProperty(nameof(JObject.UserId), [nameof(JObjectPayload.data), nameof(JObjectPayload.data.relationships.user.id)])]
public partial JObjectPayload JObjectToJObjectPayload(JObject jObject);

All this does is places the user ID in to the JObjectPayload ID IE:

data{
    id = "1234",
    type = "",
    relationships{
        user{
            id = ""
        }
    }
}

If anyone could help point out where I've gone wrong, or if what I'm attempting to do cannot be handled by Mapperly then I'd be very grateful!

Thanks!

[latonz]

If you use the array syntax, each item in the array is a segment in the resulting member path.
So if you want a member path "data.relationships.user.id" you need [nameof(JObjectPayload.data), nameof(JObjectPayload.data.relationships), nameof(JObjectPayload.data.relationships.user), nameof(JObjectPayload.data.relationships.user.id)].

[burnmw1987]

Thank you @latonz ! That's exactly what I needed. Now you say it, it's pretty obvious!

Thanks so much for your help!