CODEWITHSUNDEEP
c#.netservicestackormlite-servicestack
Giacomo Tagliabue
Giacomo Tagliabue

Reputation: 1759

Querying POCO's with References

I have the following (simplified) datamodel:

public class Order : IHasId<long>
{
    [AutoIncrement]
    public long Id { get; set; }

    [References(typeof(Material))]
    public long MaterialId { get; set; }

    [Reference]
    public Material Material { get; set; }
}

public class Material : IHasId<long>
{
    [AutoIncrement]
    public long Id { get; set; }

    public string Name { get; set; }
}

What I want to achieve is to populate Order.Material with the material referenced by MaterialId, is there a way to achieve that in a simple way? The Load APIs seem to do something similar, but in the inverse situation (when the reference is on Material, not on Order)

Upvotes: 1

Views: 245

Answers (1)

mythz
mythz

Reputation: 143284

This is called Self References in OrmLite and works with your above example:

public class Order : IHasId<long>
{
    [AutoIncrement]
    public long Id { get; set; }

    [References(typeof(Material))]
    public long MaterialId { get; set; }

    [Reference]
    public Material Material { get; set; }
}

public class Material : IHasId<long>
{
    [AutoIncrement]
    public long Id { get; set; }

    public string Name { get; set; }
}

db.Insert(new Material { Name = "A" });
db.Insert(new Material { Name = "B" });

db.Insert(new Order {
    MaterialId = 2,
});

var order = db.LoadSingleById<Order>(1);

order.PrintDump();

Recursively print object graph to Output:

{
    Id: 1,
    MaterialId: 2,
    Material: 
    {
        Id: 2,
        Name: B
    }
}

Upvotes: 1

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