Correct. Task is a reference to CubeNet.Service.DomainObjects.Task, NOT
System.Threading.Tasks.Task
On Thursday, April 16, 2015 at 3:59:32 AM UTC-7, mwpowellhtx wrote:
>
> On Wednesday, April 15, 2015 at 6:41:34 PM UTC-4, brainbolt wrote:
> > I'm accustomed to seeing "No persister for:" errors when I don't have a
> class map defined for one of my classes, but not for an internal NHibernate
> class.
> > I'm the getting this exception when I attempt to access
> the Tasks collection defined in the following relationship. It doesn't make
> a difference if the collection is eager or lazy loaded, except that if it
> is lazy loaded, the exception isn't thrown until I try to access the
> collection, so it seems that the exception is the result of NHibernate
> trying to query for the collection.
> > I'm using the Fluent API for the mappings, but I've included the
> resulting hbm.xml file below.
> > TaskContainer (base class)public abstract class TaskContainer :
> DomainObject
> > {
> > public virtual IList<Task> Tasks { get; set; }
> > }
> > Taskpublic class Task : TaskContainer
> > {
> > public virtual TaskContainer TaskContainer { get; set; }
> > public virtual string Description { get; set; }
> >
> > public virtual void AddChildTask(Task childTask)
> > {
> > if (Tasks == null)
> > {
> > Tasks = new List<Task>();
> > }
> >
> > childTask.TaskContainer = this;
> > Tasks.Add(childTask);
> > }
> >
> > public static Task Get(int id)
> > {
> > return Get<Task>(id);
> > }
> > }
> > TaskMappublic class TaskMap : ClassMap<Task>
> > {
> > public TaskMap()
> > {
> > Id(x => x.Id);
> > Map(x => x.Description);
> > ReferencesAny(x => x.TaskContainer)
> > .EntityIdentifierColumn("TaskContainer_Id")
> > .EntityTypeColumn("TaskContainerDiscriminator")
> > .IdentityType<int>()
> > .AddMetaValue<Task>("Task");
> > HasMany(x => x.Tasks)
> > .KeyColumns.Add("TaskContainer_Id",
> "TaskContainerDiscriminator")
> > .PropertyRef("TaskContainer")
> > .Not.LazyLoad();
> > }
> > }
> > Exported hbm.xml map<hibernate-mapping
> xmlns="urn:nhibernate-mapping-2.2" default-cascade="all">
> > <class xmlns="urn:nhibernate-mapping-2.2" lazy="false"
> name="CubeNet.Service.DomainObjects.Task, CubeNet.Service, Version=1.0.0.0,
> Culture=neutral, PublicKeyToken=null" table="`Task`">
> > <id name="Id" type="System.Int32, mscorlib, Version=4.0.0.0,
> Culture=neutral, PublicKeyToken=b77a5c561934e089">
> > <column name="Id" />
> > <generator class="identity" />
> > </id>
> > <bag name="Tasks">
> > <key property-ref="TaskContainer">
> > <column name="TaskContainer_Id" />
> > <column name="TaskContainerDiscriminator" />
> > </key>
> > <one-to-many class="CubeNet.Service.DomainObjects.Task,
> CubeNet.Service, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
> > </bag>
> > <property name="Description" type="System.String, mscorlib,
> Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
> > <column name="Description" />
> > </property>
> > <any id-type="System.Int32, mscorlib, Version=4.0.0.0,
> Culture=neutral, PublicKeyToken=b77a5c561934e089" meta-type="System.String,
> mscorlib, Version=4.0.0.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089" name="TaskContainer">
> > <meta-value value="Task"
> class="CubeNet.Service.DomainObjects.Task, CubeNet.Service,
> Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
> > <column name="TaskContainerDiscriminator" />
> > <column name="TaskContainer_Id" />
> > </any>
> > </class>
> > </hibernate-mapping>
>
> Not to be confused with TPL, threading Task?
>
> > Saving records with this configuration works as expected and produces
> the following table with these recordsId Description
> TaskContainerDiscriminator TaskContainer_Id
> > -- ----------- -------------------------- ----------------
> > 1 Parent task NULL NULL
> > 2 Child Task Task 1
> > Retrieving the either record works, but the exception is thrown when
> attempting to access the collection of child records.
>
>
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