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PO
 

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    <p>In my opinion this should work:</p> <pre><code>public class Photo { [Key, ForeignKey("Parent"), Column(Order = 1)] public int PhotoCollectionId { get; set; } [Key, Column(Order = 2)] public int PhotoId { get; set; } public virtual PhotoCollection Parent { get; set; } public virtual ISet&lt;PhotoProperty&gt; PhotoProperties { get; private set; } //... } public class PhotoProperty { [Key, ForeignKey("Parent"), Column(Order = 1)] public int PhotoCollectionId { get; set; } [Key, ForeignKey("Parent"), Column(Order = 2)] public int PhotoId { get; set; } [Key, Column(Order = 3)] public int PhotoPropertyId { get; set; } public virtual Photo Parent { get; set; } //... } </code></pre> <p>Note that <code>PhotoCollectionId</code> in <code>PhotoProperty</code> doesn't refer to a <code>PhotoCollection</code> but is part of the composite foreign key <code>(PhotoCollectionId,PhotoId)</code> that refers to <code>Photo</code>.</p> <p>And yes, you can define the whole mapping with Fluent API:</p> <pre><code>modelBuilder.Entity&lt;PhotoCollection&gt;() .HasMany(pc =&gt; pc.Photos) .WithRequired(p =&gt; p.Parent) .HasForeignKey(p =&gt; p.PhotoCollectionId); modelBuilder.Entity&lt;Photo&gt;() .HasKey(p =&gt; new { p.PhotoCollectionId, p.PhotoId }); modelBuilder.Entity&lt;Photo&gt;() .Property(p =&gt; p.PhotoId) .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); modelBuilder.Entity&lt;Photo&gt;() .HasMany(p =&gt; p.PhotoProperties) .WithRequired(pp =&gt; pp.Parent) .HasForeignKey(pp =&gt; new { pp.PhotoCollectionId, pp.PhotoId }); modelBuilder.Entity&lt;PhotoProperty&gt;() .HasKey(pp =&gt; new { pp.PhotoCollectionId, pp.PhotoId, pp.PhotoPropertyId }); modelBuilder.Entity&lt;PhotoProperty&gt;() .Property(pp =&gt; pp.PhotoPropertyId) .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); </code></pre>
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    1. COThank you very much it works perfectly.
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      1. USAndy Baker
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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