Hi Diego,
Are you running off of the trunk? Because this still throws that exception with
Alpha1:
IList<ParentObject> pos =
session.Query<ParentObject>().Cacheable().Fetch(po =>
po.ChildObjects).ToList();
Thanks,
Eduardo
From: [email protected] [mailto:[email protected]] On Behalf Of
Diego Mijelshon
Sent: Thursday, August 19, 2010 10:28 AM
To: [email protected]
Subject: Re: [nhusers] RE: .Cacheable().Fetch() throws 'Exception occurred
getter of xxx'
Well, I don't know what the code of
IPersistenceService.Find does, but the following works here:
session.Query<Foo>().Cacheable().Fetch(f => f.Bar).ToList();
And I don't get the idea behind "from po in ParentObjects select po"; that's a
noop.
Diego
On Thu, Aug 19, 2010 at 11:08, Segura, Eduardo [Tech]
<[email protected]<mailto:[email protected]>> wrote:
Hi folks,
Could I get your feedback on this one? Am I missing something?
Thanks,
From: Segura, Eduardo [Tech]
Sent: Tuesday, August 17, 2010 1:29 PM
To: '[email protected]<mailto:[email protected]>'
Subject: .Cacheable().Fetch() throws 'Exception occurred getter of xxx'
I'm wondering if this is the right way to use second-level caching along with
eagerly loading a collection.
This code is equivalent to a query that we are issuing from a fairly large
application. I've stripped it down to the very minimum while still throwing the
exception.
(My apologies for the rather large email, but I want to provide as much
information up-front as possible)
I have this test set up:
[TestMethod]
public void FindWithFetchAndCacheableTest()
{
IPersistenceService ps =
PersistenceServiceFactory.CreateService(PersistenceServiceType.Hibernate);
IList<ParentObject> pos = ps.Find<ParentObject,
IQueryable<ParentObject>>(ParentObjects =>
from po in ParentObjects
select po)
.Cacheable()
.Fetch(po => po.ChildObjects).ToList();
Assert.IsTrue(pos.Count > 0);
}
My uneducated guess:
--------------------------------------
The lambda expression in Fetch() is being used as a 'resultTransfomer' here:
(NHibernate.Hql.Ast.ANTLR.Loader.QueryLoader.cs:line 335, using NH3.0.0Alpha1)
protected override object GetResultColumnOrRow(object[] row, IResultTransformer
resultTransformer, IDataReader rs,
ISessionImplementor session)
{
row = ToResultRow(row); <-- after this assignment, row is an
Array[1] holding my object
bool hasTransform = HasSelectNew || resultTransformer != null;
<-- at this point, resultTransformer has a lambda
...
else if (!hasTransform)
{
return row.Length == 1 ? row[0] : row; <-- the
object is not extracted from the array, because of the lambda
}
}
And this method ends up returning an array (object[1] = [{ ParentObject}]),
instead of returning the object itself.
Then later on, since the 'object[1]' array doesn't have an 'Id' property, this
line throws the exception:
(NHibernate.Properties.BasicPropertyAccessor.cs:Line 207 (BasicGetter.Get)):
public object Get(object target)
{
try
{
return property.GetValue(target, new
object[0]); <-- target is not {ParentObject}, but an object[1] instead
}
catch (Exception e)
{
throw new PropertyAccessException(e, "Exception
occurred", false, clazz, propertyName);
}
}
My classes:
------------------------------------------------------
public class ParentObject
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual ISet<ChildObject> ChildObjects { get; set; }
public virtual void AddChildObject(ChildObject co)
{
this.ChildObjects.Add(co);
co.Parent = this;
}
}
public class ChildObject
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual ParentObject Parent { get; set; }
}
Mappings:
----------------------------------------
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="PersistenceLayer.Test.Model.ParentObject, PersistenceLayer.Test">
<cache usage="read-write"/>
<id name="Id">
<generator class="native"/>
</id>
<property name="Name"/>
<set name="ChildObjects" inverse="true" cascade="all-delete-orphan">
<cache usage="read-write"/>
<key column="ParentId"/>
<one-to-many class="PersistenceLayer.Test.Model.ChildObject"/>
</set>
</class>
</hibernate-mapping>
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true">
<class name="PersistenceLayer.Test.Model.ChildObject, PersistenceLayer.Test">
<cache usage="read-write"/>
<id name="Id">
<generator class="native"/>
</id>
<property name="Name"/>
<many-to-one name="Parent" column="ParentId" not-null="true"/>
</class>
</hibernate-mapping>
But it throws this exception:
Test method
PersistenceLayer.Test.PersistenceServiceTest.FindWithFetchAndCacheableTest
threw exception: NHibernate.PropertyAccessException: Exception occurred getter
of
PersistenceLayer.Test.Model.ParentObject.Id<http://PersistenceLayer.Test.Model.ParentObject.Id>
---> System.Reflection.TargetException: Object does not match target type..
System.Reflection.RuntimeMethodInfo.CheckConsistency(Object target)
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr,
Binder binder, Object[] parameters, CultureInfo culture, Boolean
skipVisibilityChecks)
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr,
Binder binder, Object[] parameters, CultureInfo culture)
System.Reflection.RuntimePropertyInfo.GetValue(Object obj, BindingFlags
invokeAttr, Binder binder, Object[] index, CultureInfo culture)
System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get(Object target) in
d:\CSharp\NH\nhibernate\src\NHibernate\Properties\BasicPropertyAccessor.cs:
line 207
NHibernate.Properties.BasicPropertyAccessor.BasicGetter.Get(Object target) in
d:\CSharp\NH\nhibernate\src\NHibernate\Properties\BasicPropertyAccessor.cs:
line 211
NHibernate.Tuple.Entity.AbstractEntityTuplizer.GetIdentifier(Object entity) in
d:\CSharp\NH\nhibernate\src\NHibernate\Tuple\Entity\AbstractEntityTuplizer.cs:
line 139
NHibernate.Persister.Entity.AbstractEntityPersister.GetIdentifier(Object obj,
EntityMode entityMode) in
d:\CSharp\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs:
line 3838
NHibernate.Persister.Entity.AbstractEntityPersister.IsTransient(Object entity,
ISessionImplementor session) in
d:\CSharp\NH\nhibernate\src\NHibernate\Persister\Entity\AbstractEntityPersister.cs:
line 3629
NHibernate.Engine.ForeignKeys.IsTransient(String entityName, Object entity,
Nullable`1 assumed, ISessionImplementor session) in
d:\CSharp\NH\nhibernate\src\NHibernate\Engine\ForeignKeys.cs: line 193
NHibernate.Engine.ForeignKeys.GetEntityIdentifierIfNotUnsaved(String
entityName, Object entity, ISessionImplementor session) in
d:\CSharp\NH\nhibernate\src\NHibernate\Engine\ForeignKeys.cs: line 249
NHibernate.Type.ManyToOneType.Disassemble(Object value, ISessionImplementor
session, Object owner) in
d:\CSharp\NH\nhibernate\src\NHibernate\Type\ManyToOneType.cs: line 137
NHibernate.Cache.StandardQueryCache.Put(QueryKey key, ICacheAssembler[]
returnTypes, IList result, Boolean isNaturalKeyLookup, ISessionImplementor
session) in d:\CSharp\NH\nhibernate\src\NHibernate\Cache\StandardQueryCache.cs:
line 82
NHibernate.Loader.Loader.PutResultInQueryCache(ISessionImplementor session,
QueryParameters queryParameters, IType[] resultTypes, IQueryCache queryCache,
QueryKey key, IList result) in
d:\CSharp\NH\nhibernate\src\NHibernate\Loader\Loader.cs: line 1627
NHibernate.Loader.Loader.ListUsingQueryCache(ISessionImplementor session,
QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes) in
d:\CSharp\NH\nhibernate\src\NHibernate\Loader\Loader.cs: line 1593
NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters
queryParameters, ISet`1 querySpaces, IType[] resultTypes) in
d:\CSharp\NH\nhibernate\src\NHibernate\Loader\Loader.cs: line 1567
NHibernate.Hql.Ast.ANTLR.Loader.QueryLoader.List(ISessionImplementor session,
QueryParameters queryParameters) in
d:\CSharp\NH\nhibernate\src\NHibernate\Hql\Ast\ANTLR\Loader\QueryLoader.cs:
line 298
NHibernate.Hql.Ast.ANTLR.QueryTranslatorImpl.List(ISessionImplementor session,
QueryParameters queryParameters) in
d:\CSharp\NH\nhibernate\src\NHibernate\Hql\Ast\ANTLR\QueryTranslatorImpl.cs:
line 110
NHibernate.Engine.Query.HQLQueryPlan.PerformList(QueryParameters
queryParameters, ISessionImplementor session, IList results) in
d:\CSharp\NH\nhibernate\src\NHibernate\Engine\Query\HQLQueryPlan.cs: line 105
NHibernate.Impl.SessionImpl.List(IQueryExpression queryExpression,
QueryParameters queryParameters, IList results) in
d:\CSharp\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs: line 679
NHibernate.Impl.SessionImpl.List(IQueryExpression queryExpression,
QueryParameters parameters) in
d:\CSharp\NH\nhibernate\src\NHibernate\Impl\SessionImpl.cs: line 655
NHibernate.Impl.ExpressionQueryImpl.List() in
d:\CSharp\NH\nhibernate\src\NHibernate\Impl\ExpressionQueryImpl.cs: line 63
NHibernate.Linq.NhQueryProvider.Execute(Expression expression) in
d:\CSharp\NH\nhibernate\src\NHibernate\Linq\NhQueryProvider.cs: line 31
NHibernate.Linq.NhQueryProvider.Execute[TResult](Expression expression) in
d:\CSharp\NH\nhibernate\src\NHibernate\Linq\NhQueryProvider.cs: line 55
GetEnumerator()
ctor(IEnumerable`1 collection)
System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
PersistenceLayer.Test.PersistenceServiceTest.FindWithFetchAndCacheableTest() in
.....\PersistenceServiceTest.cs: line 345
Thanks,
Eduardo
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