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POEntity Framework multitenant shared data architecture: single column, multiple foreign keys
 

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    <p>I have the following data structure:</p> <pre><code>//property Notification abstract class BindableBase { } //base class for all tenant-scoped objects abstract class TenantModelBase : BindableBase { int TenantId; } abstract class Order : TenantModelBase { Customer Customer; //works: mapped using TenantId and CustomerId Product Product; //again, works with TenantId and ProductId string ProductId; string CustomerId; } class Customer: TenantModelBase { string CustomerId; } class Product : TenantModelBase { string ProductId; } class SpecialOrder : Order { OtherClass OtherClass; //this fails!, see below string OtherClassId; } class SuperSpecialOrder : SpecialOrder { } class OtherClass : TenantModelBase { string OtherClassId; } </code></pre> <p>I get the following error:</p> <blockquote> <p>The foreign key component 'TenantId' is not a declared property on type 'SpecialOrder'. Verify that it has not been explicitly excluded from the model and that it is a valid primitive property.</p> </blockquote> <p>Error occurs using the Fluent Api Configuration:</p> <pre><code> config.HasRequired(p =&gt; p.OtherClass) .WithMany(oc =&gt; oc.SpecialOrders) .HasForeignKey(p =&gt; new { p.TenantId, p.OtherClassId}); </code></pre> <p>Without the <code>OtherClass</code> reference in <code>SpecialOrder</code> I can create objects freely without problems (including <code>SpecialOrder</code>, <code>SuperSpecialOrder</code> etc). </p> <p>Anyone have a clue what's going on? I'm lost here :(</p> <p><strong>Edit</strong> I've seen in other questions that people remove the TenantId from tables, this is not an option since primary keys are not unique across tenants and we want to keep the shared data architecture.</p> <p>I know the workaround is having a second TenantId in the SpecialOrder class, but this does not seem logical to me. </p>
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    1. COI think it's the same kind of problem like this one: http://stackoverflow.com/questions/10961690/inheritance-and-composite-foreign-keys-one-part-of-the-key-in-base-class-the Could you show your mapping more precisely? What is `config`? I guess an `EntityTypeConfiguration<T>` with `T` = `SpecialOrder`, right? How does the mapping look like for `Order.Customer`? Do you create this mapping with `T` = `SpecialOrder` or `T` = `Order`?
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    2. COThe problem arises when I specify a mapping for both Order and SpecialOrder. It then loses sight of any property declared in the base class at SpecialOrder. It seems to be the same question indeed.
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