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POFluent NHibernate - Error dehydrating property value; given key was not present in the dictionary
 

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  1. POFluent NHibernate - Error dehydrating property value; given key was not present in the dictionary
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    <p>I have a class called <code>ProjectTaskBudget</code> that has a property of type <code>IBudgetableIncomeStream</code>, like so:</p> <pre><code>public class ProjectTaskBudget { public virtual IBudgetableIncomeStream BudgetableIncomeStream { get; set; } } </code></pre> <p><code>IBudgetableIncomeStream</code> is an interface that's applied to, among other things, an abstract class called <code>Deliverable</code>:</p> <pre><code>public abstract class Deliverable : IBudgetableIncomeStream { // Some stuff } </code></pre> <p>and a concrete class called <code>RecurringIncomeLine</code>:</p> <pre><code>public class RecurringIncomeLine : IBudgetableIncomeStream { // Some stuff } </code></pre> <p>The concrete classes that inherit from <code>Deliverable</code> are <code>DeliverableItem</code> and <code>DeliverableTime</code>.</p> <p>The mapping for <code>ProjectTaskBudget</code> looks like this:</p> <pre><code>public class ProjectTaskBudgetMap : MappingBase&lt;ProjectTaskBudget&gt; { public ProjectTaskBudgetMap() { ReferencesAny(n =&gt; n.BudgetableIncomeStream) .EntityTypeColumn("IncomeStreamType") .EntityIdentifierColumn("IncomeStream_id") .AddMetaValue&lt;Deliverable&gt;("Deliverable") .AddMetaValue&lt;RecurringIncomeLine&gt;("RecurringIncomeLine") .IdentityType&lt;Guid&gt;(); } } </code></pre> <p>This works as it should with the <code>RecurringIncomeLine</code>, so I suspect the problem is to do with the abstract/interface mapping. When I try to add a new <code>ProjectTaskBudget</code> to the database using a <code>Deliverable</code>, and flush, I get this error: </p> <pre><code>NHibernate.PropertyValueException: Error dehydrating property value for xxx.xxx.xxx.ProjectTaskBudget.BudgetableIncomeStream ---&gt; System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.Collections.Generic.Dictionary`2.get_Item(TKey key) at NHibernate.Type.MetaType.NullSafeSet(IDbCommand st, Object value, Int32 index, ISessionImplementor session) at NHibernate.Type.AnyType.NullSafeSet(IDbCommand st, Object value, Int32 index, Boolean[] settable, ISessionImplementor session) at NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index) --- End of inner exception stack trace --- at NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index) at NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Boolean[] notNull, Int32 j, SqlCommandInfo sql, Object obj, ISessionImplementor session) at NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Object obj, ISessionImplementor session) at NHibernate.Action.EntityInsertAction.Execute() at NHibernate.Engine.ActionQueue.Execute(IExecutable executable) at NHibernate.Engine.ActionQueue.ExecuteActions(IList list) at NHibernate.Engine.ActionQueue.ExecuteActions() at hiJump.Infrastructure.DataAccess.EventListeners.FixedDefaultFlushEventListener.PerformExecutions(IEventSource session) in c:\code\Git\Harmony\SharedCode\hiJump\hiJump.Infrastructure\DataAccess\EventListeners\FixedDefaultFlushEventListener.cs:line 35 at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event) at NHibernate.Impl.SessionImpl.Flush() </code></pre> <p>I'm wondering if applying the interface directly to <code>DeliverableItem</code> and <code>DeliverableTime</code> would make a difference, and have the mapping include </p> <pre><code>.AddMetaValue&lt;DeliverableItem&gt;("DeliverableItem") .AddMetaValue&lt;DeliverableTime&gt;("DeliverableTime") </code></pre> <p>but that's a reasonably big refactor, so I wanted to check first and see if I was missing anything more obvious, or if that sounded like nonsense. </p>
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    1. USColm Prunty
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    1. CODoes it work if you just remove `.AddMetaValue<Deliverable>("Deliverable")` and add `.AddMetaValue<DeliverableItem>("DeliverableItem")` and `.AddMetaValue<DeliverableTime>("DeliverableTime")` without actually changing the classes? Changing the classes should be unnecessary, because they already implement `IBudgetableIncomeStream` via their base class.
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      1. USDaniel Hilgarth
    2. COI did try that, forgot to mention, it returns the same error.
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      1. POFluent NHibernate - Error dehydrating property value; given key was not present in the dictionary
      1. USColm Prunty
    3. COPlease make sure that NHibernate is not trying to save `Deliverable` to its own table.
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      1. POFluent NHibernate - Error dehydrating property value; given key was not present in the dictionary
      1. USDaniel Hilgarth
 

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