[Xdes]

My VB is a bit rusty, but you will need to define associations in the configuration.

First add foreign keys to to models (e.g. In the Build class add MainlineID for the Mainline object).

Then you can define the configuration:

    Public Class BuildConfiguration
        Implements EntityTypeConfiguration(Of Build)

        Public Sub New()
            ToTable("Build")
            ' Other mappings
            ' Define one-to-many
            HasRequired(Function(x) x.Mainline) _
            .WithMany(Function(x) x.Builds) _
            .HasForeignKey(Function(x) x.MainlineID)
        End Sub
    End Class

Inside your context you load the configuration:

    Public Class MyContext
        Inherits DbContext

        Public Property Builds As DbSet(Of Build)

        Protected Overrides Sub OnModelCreating(modelBuilder As DbModelBuilder)
            MyBase.OnModelCreating(modelBuilder)
            modelBuilder.Configurations.Add(New BuildConfiguration())
        End Sub
    End Class

Then you can use the Include extension method (or eager loading) on the DbContext to populate the object.

    Using context As New MyContext()
        Return context.Builder.Include(Function(b) b.Mainline)
    End Using

See also:

http://weblogs.asp.net/manavi/archive/2011/05/17/association...

[TheRealDunkirk]

I had seen that linked writeup before, but was confused, because much of that code looked unnecessary for EF6. I relegated it to only being applicable to version 4. Indeed, all I needed to do (as below) was use .SelectMany(). That being said, though... Wow, your Fluent API-fu is strong.