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POFluent NHibernate 1.2 with SubclassMap causes "No row with the given identifier" error
 

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  1. POFluent NHibernate 1.2 with SubclassMap causes "No row with the given identifier" error
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    <p>I am trying to upgrade to Fluent NHibernate 2.1 (Build #694). As a result, I am also upgrading to NHibernate 3.0. I am having an issue with a "Table-Per-Subclass" mapping, which results in error when trying to retrieve data. </p> <p><strong>Important Note:</strong> these tables and classes worked with the now deprecated version of "Joined-Subclass" mapping which existed in a previous version of FluentNhibernate, which allowed the subclass to have its own unique id.</p> <p>I have whittled the code down to its smallest parts, so let me explain, via code and it will become more clear:</p> <p>Here are the tables involved:</p> <p><img src="https://i.stack.imgur.com/powFU.png" alt="Tables"></p> <p>Here are the classes representing the tables:</p> <pre><code>public class Field { public virtual int Id { get; set; } public virtual string Code { get; set; } public virtual string Description { get; set; } } public class MenuItem : Field { public virtual string NavigateUrl { get; set; } } public class UserLink { public virtual int Id { get; set; } public virtual string ExternalLinkName { get; set; } public virtual MenuItem MenuItem { get; set; } public virtual int UserId { get; set; } } </code></pre> <p>Here are the corresponding Mappings:</p> <pre><code>public class FieldMap : ClassMap&lt;Field&gt; { public FieldMap() { Table("Field"); Id(x =&gt; x.Id, "ID").GeneratedBy.Identity(); Map(x =&gt; x.Code, "Code"); Map(x =&gt; x.Description, "Description"); } } public class MenuItemMap : SubclassMap&lt;MenuItem&gt; { public MenuItemMap() { Table("MenuItem"); Map(x =&gt; x.NavigateUrl, "NavigateUrl"); } } public class UserLinkMap : ClassMap&lt;UserLink&gt; { public UserLinkMap() { Table("UserLink"); Id(x =&gt; x.Id, "ID").GeneratedBy.Identity(); Map(x =&gt; x.ExternalLinkName, "ExternalLinkName"); Map(x =&gt; x.UserId, "User_ID"); References(x =&gt; x.MenuItem).Column("ID"); } } </code></pre> <p>Here is the test:</p> <pre><code>[Test] public void CanRetrieveUserLinks() { ISession session = GetSession(); DetachedCriteria criteria = DetachedCriteria.For(typeof (UserLink)) .Add(Restrictions.Eq("UserId", 1)); ICriteria executableCriteria = criteria.GetExecutableCriteria(session); var userLinks = executableCriteria.List&lt;UserLink&gt;(); Assert.IsFalse(string.IsNullOrEmpty(userLinks[0].MenuItem.NavigateUrl)); session.Close(); } </code></pre> <p>When the Assert line is executed, the SQL generated is incorrect as it <strong>tries to lookup the MenuItem by Field_ID instead of ID</strong>. Therefore, I receive the error: <code>NHibernate.ObjectNotFoundException: No row with the given identifier exists[AS.AIMS.DomainModel.MenuItem#11]</code></p> <p>First the sql is generated to retrieve the userLinks, which is correct:</p> <pre><code>SELECT this_.ID as ID2_0_, this_.ExternalLinkName as External2_2_0_, this_.User_ID as User3_2_0_ FROM UserLink this_ WHERE this_.User_ID = 1 /* @p0 */ </code></pre> <p>Then to retrieve the Menu Item, it uses Field_Id instead of ID:</p> <pre><code>SELECT menuitem0_.Field_id as ID0_0_, menuitem0_1_.Code as Code0_0_, menuitem0_1_.Description as Descript3_0_0_, menuitem0_.NavigateUrl as Navigate2_1_0_ FROM MenuItem menuitem0_ inner join Field menuitem0_1_ on menuitem0_.Field_id = menuitem0_1_.ID WHERE menuitem0_.Field_id = 11 /* @p0 */ </code></pre>
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    1. This table or related slice is empty.
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    1. USPat
    1. USPat
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COfluent 1.2 / nh3.1 went live today. http://fluentnhibernate.org/blog/2011/04/03/fluent-nhibernate-1.2-released
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      1. POFluent NHibernate 1.2 with SubclassMap causes "No row with the given identifier" error
      1. US4imble
    2. COThis isn't your full code, is it? What does menuitem subclassmap from?
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      1. POFluent NHibernate 1.2 with SubclassMap causes "No row with the given identifier" error
      1. USDavid Kemp
    3. COMenuItem is a subclass from Field. This is defined in the class declaration: `public class MenuItem : Field`
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      1. POFluent NHibernate 1.2 with SubclassMap causes "No row with the given identifier" error
      1. USPat
 

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