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    <p>Try this:</p> <pre><code>public class Foo { public int Id { get; set; } public virtual Bar Bar { get; set; } } public class Bar { public int Id {get; set;} public virtual Foo LeftFoo {get;set;} public virtual Foo RightFoo {get;set;} } protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity&lt;Bar&gt;() .HasOptiona(b =&gt; b.LeftFoo) .WithOptionalDependent() .Map(k = k.MapKey("LeftFooId")); modelBuilder.Entity&lt;Bar&gt;() .HasOptional(b =&gt; b.RightFoo) .WithOptionalDependent() .Map(k =&gt; k.MapKey("RightFooId")); ... } </code></pre> <p><strong><em>Result</em></strong></p> <p><img src="https://i.stack.imgur.com/2IZRN.png" alt="Table Screenshot"></p> <p><strong><em>Edit for seeding</em></strong></p> <p>I would do the following, didn't test the code, but it should work:</p> <pre><code>var bars = new List&lt;Bar&gt;(); bars.Add(new Bar()); bars.Add(new Bar()); ...//this means as many as you need/want bars.ForEach(b =&gt; context.Bars.AddOrUpdate(b)); context.SaveChanges(); var leftFoos = new List&lt;Foo&gt;(); leftFoos.Add(new Foo()); leftFoos.Add(new Foo()); ...//this means as many as you need/want leftFoos.ForEach(f =&gt; context.Foos.AddOrUpdate(f)); context.SaveChanges(); var rightFoos = new List&lt;Foo&gt;(); rightFoos.Add(new Foo()); rightFoos.Add(new Foo()); ...//this means as many as you need/want rightFoos.Foreach(f =&gt; context.Foos.AddOrUpdate(f)); context.SaveChanges(); int i=0; foreach(var bar in bars) { bar.LeftFoo = leftFoos.ElementAt(i); bar.RightFoo = rightFoos.ElementAt(i); i++; } context.SaveChanges(); </code></pre> <p>For simplicity <code>bars</code>, <code>leftFoos</code> and <code>rightFoos</code> have the same number of elements.</p>
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    1. COThis gives me exactly what I already had. The FK's are there, but when I assign the LeftFoo and RightFoo, those Foo's Bar_Id remains null. I tried to remedy this by adding to OptionalDependent(f => f.Bar), but that gives me the error: Schema specified is not valid. Errors: (85,6) : error 0040: Type Bar_LeftFoo is not defined in namespace (Alias=Self).
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    2. COAre you sure you are not doing something else? As I tested this locally and it works. How are you assigning `left` and `right` to bar? can you post that?
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    3. COWhat I'm currently doing in my Seed is making a bunch of Bar's with all fk's null then save changes, then I loop over all Bars, and I create a new foo for each empty leftfoo or rightfoo, leaving the Bar property null, then I do another Save. Then I assign the new foo to the bar (bar.leftfoo = foo). Then an update and a save.
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