[nhibernate-issues] [NHJIRA] Commented: (NH-2587) .Cacheable().Fetch() throws 'Exception occurred getter of xxx' Options

[Patrick E. (JIRA) <nh...@gm...>]

    [ http://216.121.112.228/browse/NH-2587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=20892#action_20892 ] 

Patrick Earl commented on NH-2587:
----------------------------------

The rabbit hole goes deep on this one.  It's fundamentally related to complications between result transformers and caching.  This is apparently fixed in Hibernate 4.0, but it looks like there would be a substantial amount of work to figure out exactly what and how to port.  Because fetching can create duplicate rows, Linq adds a distinct result transformer.  I'll think more on this.

> .Cacheable().Fetch() throws 'Exception occurred getter of xxx' Options 
> -----------------------------------------------------------------------
>
>                 Key: NH-2587
>                 URL: http://216.121.112.228/browse/NH-2587
>             Project:  NHibernate
>          Issue Type: Bug
>          Components: Linq Provider
>    Affects Versions: 3.1.0
>            Reporter: Eduardo Segura
>            Assignee: Patrick Earl
>            Priority: Major
>         Attachments: CacheableFetchTest.zip
>
>
> This query:
> IList<ParentObject> pos = session.Query<ParentObject>().Cacheable().Fetch(po => po.ChildObjects).ToList();
> throws this exception:
> NHibernate.PropertyAccessException: Exception occurred getter of CacheableFetchTest.Entity`1[[System.Guid, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].Id --->  System.Reflection.TargetException: Object does not match target type.. 
> For a detailed discussion, including full exception stacks, please see:
> http://groups.google.com/group/nhusers/browse_thread/thread/dfdbe987d8450b0a/cb812c856e07ee0a

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