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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