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    <p>This is a known issue with 4.3 and 4.3.1. (We found it too late to put the fix in 4.3.1.) Luckily there is a fairly simple way to change your code that should make it work.</p> <p>In a nutshell, you used to be able to make chained map calls on a single EntityConfiguration in 4.1. and 4.2. Something like this pattern:</p> <pre><code>modelBuilder.Entity&lt;Parent&gt;() .Map&lt;Foo&gt;(...) .Map&lt;Bar&gt;(...); </code></pre> <p>This doesn't work in 4.3 and instead you have to make each Map call on an EntityConfiguration for that entity. So a pattern something like this:</p> <pre><code>modelBuilder.Entity&lt;Foo&gt;() .Map&lt;Foo&gt;(...); modelBuilder.Entity&lt;Bar&gt;() .Map&lt;Bar&gt;(...); </code></pre> <p>Taking your case specifically, this should work:</p> <pre><code>protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity&lt;ParentClass&gt;() .ToTable("Parent"); modelBuilder.Entity&lt;Foo&gt;() .Map(m =&gt; { m.Requires("IsActive").HasValue(1); m.Requires("Type").HasValue("Foo"); }); modelBuilder.Entity&lt;Bar&gt;() .Map(m =&gt; { m.Requires("IsActive").HasValue(1); m.Requires("Type").HasValue("Bar"); }); } </code></pre> <p>(I've removed a few of the generic parameters since they aren't needed, but that's not important.)</p> <p>Doing this using explicit EntityConfigurations you would use something like this:</p> <pre><code>public class ParentConfiguration : EntityTypeConfiguration&lt;ParentClass&gt; { public ParentConfiguration() { ToTable("Parent"); } } public class FooConfiguration : EntityTypeConfiguration&lt;Foo&gt; { public FooConfiguration() { Map(m =&gt; { m.Requires("IsActive").HasValue(1); m.Requires("Type").HasValue("Foo"); }); } } public class BarConfiguration : EntityTypeConfiguration&lt;Bar&gt; { public BarConfiguration() { Map(m =&gt; { m.Requires("IsActive").HasValue(1); m.Requires("Type").HasValue("Bar"); }); } } </code></pre> <p>And then</p> <pre><code>protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Configurations .Add(new ParentConfiguration()) .Add(new FooConfiguration()) .Add(new BarConfiguration()); } </code></pre> <p>We plan to fix this in 5.0.</p>
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    1. USArthur Vickers
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    1. POEntity Framework 4.3 - TPH mapping and migration error
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    1. COThank you, this does just what I wanted. And in a weird manner feels right - more explicit - one configuration for each subtype. Though backward compatibility would be nice and I hope this gets fixed in future releases.
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