Hello,
I'm using NH 4.0.4.4000 to serve data through OData
using Microsoft.AspNet.OData 5.7.0. When I try to use $expand at multiple
levels, e.g.,
http://server/WebApp/OData/Profile(2848)/MentorshipsAsMentor?$expand=Mentee($expand=InstitutionalAccount),
I keep getting an NullReferenceException in NHibernate at:
at
NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitConstantExpression(ConstantExpression
expression)
at
NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitBinaryExpression(BinaryExpression
expression)
at
NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitConditionalExpression(ConditionalExpression
expression)
at
NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitMemberExpression(MemberExpression
expression)
at
NHibernate.Linq.Visitors.SelectJoinDetector.VisitMemberExpression(MemberExpression
expression)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitConditionalExpression(ConditionalExpression
expression)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment
memberAssigment)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1
list, Func`2 visitMethod)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression
expression)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment
memberAssigment)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1
list, Func`2 visitMethod)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression
expression)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment
memberAssigment)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1
list, Func`2 visitMethod)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression
expression)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment
memberAssigment)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1
list, Func`2 visitMethod)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression
expression)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment
memberAssigment)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1
list, Func`2 visitMethod)
at
Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression
expression)
at Remotion.Linq.Clauses.SelectClause.TransformExpressions(Func`2
transformation)
at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel
queryModel)
at
NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel
queryModel, VisitorParameters parameters, Boolean root)
at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor
sessionFactory, Boolean filter)
at
NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(IQueryExpression
queryExpression, String collectionRole, Boolean shallow, IDictionary`2
filters, ISessionFactoryImplementor factory)
at NHibernate.Engine.Query.QueryExpressionPlan..ctor(IQueryExpression
queryExpression, Boolean shallow, IDictionary`2 enabledFilters,
ISessionFactoryImplementor factory)
at
NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression
queryExpression, Boolean shallow, IDictionary`2 enabledFilters)
at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression
queryExpression, Boolean shallow)
at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression
queryExpression)
at NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)
at NHibernate.Linq.DefaultQueryProvider.Execute[TResult](Expression
expression)
at Remotion.Linq.QueryableBase`1.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Web.OData.Query.TruncatedCollection`1..ctor(IQueryable`1
source, Int32 pageSize)
at System.Web.OData.Query.ODataQueryOptions.LimitResults[T](IQueryable`1
queryable, Int32 limit, Boolean& resultsLimited)
I downloaded the NH source and built it so I can do a little debugging, but
nothing obvious struck me that I was doing wrong. The thing that is null is
_constantToParameterMap in NHibernate.Linq.Visitors.ExpressionKeyVisitor in
that call. If I copy the entire object tree to new objects that don't come
out of NH, this doesn't happen.
Any ideas?
Thanks,
Don
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