Backlink how to get original IQueryable<T> to update

[Vlad_Miu]

Hey guys, first time posting on here so I hope I’m in the right place…

So I’m trying to set up a backlink on this Metal RealmObject using Realm Sync.

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

    [MapTo("Name")]
    [Required]
    public string Name { get; set; }
    
    [MapTo("Bare")]
    [Backlink(nameof(Bara.TipMetal))]
    public IQueryable<Bara> Bare { get; }

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

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

    [MapTo("TipMetal")]
    public Metal TipMetal { get; set; }
}

I’m assigning Bara.Tipmetal in the Bara constructor, it works, shows up in the database.
My problem is I can’t find out how to assign it to IQueryable, this doesn’t even show up in my schema.

[papafe (Ferdinando Papale)]

Hi @Vlad_Miu and welcome

When working with backlinks you don’t actually need to assign them, as it’s automatically done by Realm. What I mean here is that once you assign Bara.TipMetal, then the IQueryable will be automatically populated.

Something like this:

var myMetal = new Metal { Name = "iron" } ;

var myBara = new Bara
{
 Name = "bara1"
 TipMetal = myMetal
}

realm.Write( () => {
    realm.Add(myBara);
}


var baraName = myMetal.Bare.First().Name <---- this will be "bara1", it's automatically populated

Please note that there could be some errors as I’m writing this from the top of my head. I hope that this will make things clearer.

[Vlad_Miu]

Thank you so much for your answer and quick reply!

I thought it worked like you just said, I must have messed up the code when pulling data from the DB.
It was confusing to me because in my realm schema I don’t see a Metal.Bare (Mapped to “Bare”) field show up but I can get the data with no trouble now.