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PONHibernate: How to filter mapped collection based on discriminator type
 

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  1. PONHibernate: How to filter mapped collection based on discriminator type
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    <p><strong>Info:</strong> There is a group object. Users can be invited to groups. There are two types of group invitations: external and internal. All invites are stored in single table using discriminator. The group object knows only about internal invites. </p> <p><strong>Problem</strong> In the Invite table there are two records. One for internal and one for external. If I load the group I will see both invites even the collection is of type InternalInvite. <img src="https://i.stack.imgur.com/u6jOz.png" alt="InternalInvite result">.</p> <pre><code>SELECT internalin0_.Group_id as Group3_1_, internalin0_.Id as Id1_, internalin0_.Id as Id0_0_, internalin0_.Group_id as Group3_0_0_, internalin0_.User_id as User5_0_0_ </code></pre> <p>FROM [AbstractInvite] internalin0_ WHERE internalin0_.Group_id = 'be60b160-659e-4157-b033-9f9e00e346c7'</p> <p>When I change the ISet collection type to AbstractInvite it will load all invites with the correct type.</p> <p><strong>Question</strong> How can I map the collection property to only InternalInvites?</p> <p>I will try to minimize the code as much as I can.</p> <p><strong>The group and the group mapping:</strong></p> <pre><code>public class Group { public Group() { InternalInvitations = new HashedSet&lt;InternalInvite&gt;(); } public virtual Guid Id { get; set; } public virtual ISet&lt;InternalInvite&gt; InternalInvitations { get; set; } } public class GroupMap : ClassMap&lt;Group&gt; { public GroupMap() { Id(x =&gt; x.Id); HasMany(x =&gt; x.InternalInvitations).Inverse(); } } </code></pre> <p><strong>The external and internal invite + mappings:</strong></p> <pre><code>public abstract class AbstractInvite { public virtual Guid Id { get; set; } public virtual Group Group { get; set; } } public class ExternalInvite : AbstractInvite { public virtual string Name { get; set; } } public class InternalInvite : AbstractInvite { public virtual User User { get; set; } } public class AbstractInviteMap : ClassMap&lt;AbstractInvite&gt; { public AbstractInviteMap() { Id(x =&gt; x.Id); References(x =&gt; x.Group); DiscriminateSubClassesOnColumn("type"); } } public class ExternalInviteMap : SubclassMap&lt;ExternalInvite&gt; { public ExternalInviteMap() { Map(x =&gt; x.Name); } } public class InternalInviteMap : SubclassMap&lt;InternalInvite&gt; { public InternalInviteMap() { References(x =&gt; x.User); } } </code></pre>
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    1. USroydukkey
    1. USmynkow
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    1. COThis should work. Please post the SQL query that is executed when you access the collection.
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    2. COI added the SQL query in the question above.
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