Dan, Thanks for the reply! I think you are exactly right with this. I've dug a little more in the last couple of days and found it only happens when I have another object with a Section object attached to it (in a belongsto) that is loaded, and then the other section object is loaded. The problem is, in the controller I am loading two collections: the model with the attached Section object called Application, and the collection of all Section objects. These are lazy loaded by the way. When they are used with the FormHelper in the view is when I actually receive the error. Also, neither of these collections use a type hierarchy at all.
I also investigated further into the source code of mono and found that the types involved were: Cannot cast from source type 'Models.Section' to destination type 'Castle.Proxies.SectionProxy', so it looks like the Proxy was already used/loaded and it is trying to cast to that I believe, or vice versa I guess. So my questions: 1) How do I clear the session in a way that still allows my lazy loaded collections to load fine in the view? (I also couldn't find how to easily clear the session besides using a new one, if you have a quick tip on that, that would be great) 2) Why does this error only occur in mono and not in MS.NET? I know you probably don't know this one off the top of your head. But do you think this is a bug in mono I should investigate and try to report, or something to do with the internals of ActiveRecord/NHibernate? Thanks so much! -Brian On Jul 30, 5:26 pm, Daniel Quirk <[email protected]> wrote: > Brian, > > In the stacktrace you'll notice DifferentTypeOperationState, this > suggests the list contains more than one type of object. The exception > is therefore probably being caused by a section object being in the > cache due to another query having already been run in this request, > and so Nhibernate returns that object instead of fetching it again, > however this object is somehow a different type, ( base say, if you > were using tipe hierarchy) , and so cannot be cast. Try clearing the > session before you run your sections query and let me know how you get > on. > > Cheers, > > Dan > > On Jul 30, 12:19 am, bluesliverx <[email protected]> wrote: > > > > > I've been butting my head against this problem for months now, and I > > know that there aren't a lot of MonoRail + Mono users out there, but I > > thought I would see if anyone has any ideas. > > > I'm using a pretty recent trunk version of MonoRail+ActiveRecord on > > mono, and I've run into this on mono 2.4, 2.6, and now even the daily > > tarball from yesterday (2.7 basically). It works fine on MS.NET. I > > receive a System.InvalidCastException when running the form helper > > select method on some activerecord objects. The objects are very > > simple (basically an Id and a Name - shown below), but in certain > > cases (and the cases seem random, but they are consistently on the > > same objects) it is throwing this exception on mono. > > > Please help me! I feel like I'm missing something and just can't find > > it. > > > Here is the full stack trace: > > > System.InvalidCastException: Cannot cast from source type to > > destination type. > > at > > System.Reflection.MonoProperty.GetterAdapterFrame[SectionProxy,Int32] > > (System.Reflection.Getter`2 getter, System.Object obj) [0x00000] in / > > root/mono/build/mono-20100729/mcs/class/corlib/System.Reflection/ > > MonoProperty.cs:245 > > at System.Reflection.MonoProperty.GetValue (System.Object obj, > > System.Object[] index) [0x00070] in /tmp/mono/build/mono-20100729/mcs/ > > class/corlib/System.Reflection/MonoProperty.cs:307 > > at Castle.MonoRail.Framework.Helpers.AbstractFormRelatedHelper > > +ReflectionValueGetter.GetValue (System.Object instance) [0x00000] in > > <filename unknown>:0 > > at > > Castle.MonoRail.Framework.Helpers.DifferentTypeOperationState.CreateItemRep > > resentation > > (System.Object current) [0x00000] in <filename unknown>:0 > > at Castle.MonoRail.Framework.Helpers.OperationState.get_Current () > > [0x00000] in <filename unknown>:0 > > at Castle.MonoRail.Framework.Helpers.FormHelper.GenerateSelect > > (System.String target, System.Object selectedValue, IEnumerable > > dataSource, IDictionary attributes) [0x00000] in <filename unknown>:0 > > at Castle.MonoRail.Framework.Helpers.FormHelper.Select > > (System.String target, System.Object selectedValue, IEnumerable > > dataSource, IDictionary attributes) [0x00000] in <filename unknown>:0 > > at CompiledViews.myviewname.Render () [0x00000] in <filename > > unknown>:0 > > at Castle.MonoRail.Views.AspView.AspViewBase.Process () [0x00000] in > > <filename unknown>:0 > > at Castle.MonoRail.Views.AspView.AspViewBase.GetContentViewContent > > () [0x00000] in <filename unknown>:0 > > at Castle.MonoRail.Views.AspView.AspViewBase.Process () [0x00000] in > > <filename unknown>:0 > > at Castle.MonoRail.Views.AspView.AspViewBase.GetContentViewContent > > () [0x00000] in <filename unknown>:0 > > at Castle.MonoRail.Views.AspView.AspViewBase.Process () [0x00000] in > > <filename unknown>:0 > > at Castle.MonoRail.Views.AspView.AspViewEngine.Process > > (System.String templateName, System.IO.TextWriter output, > > IEngineContext context, IController controller, IControllerContext > > controllerContext) [0x00000] in <filename unknown>:0 > > at > > Castle.MonoRail.Framework.Services.DefaultViewEngineManager.Process > > (System.String templateName, System.IO.TextWriter output, > > IEngineContext context, IController controller, IControllerContext > > controllerContext) [0x00000] in <filename unknown>:0 > > at Castle.MonoRail.Framework.Controller.ProcessView () [0x00000] in > > <filename unknown>:0 > > at mycontrollername.ProcessView () [0x00000] in <filename unknown>: > > 0 > > at Castle.MonoRail.Framework.Controller.RunActionAndRenderView () > > [0x00000] in <filename unknown>:0 > > > Here is the Section model that the SectionProxy is being generated > > from: > > > [ActiveRecord("sections",Lazy=true)] > > public class Section : ActiveRecordValidationBase<Section> { > > // Private variables > > private int id; > > private string name; > > > [PrimaryKey("id")] > > public virtual int Id { > > get { return id; } > > set { id = value; } > > } > > > [Property("name", NotNull=true)] > > [ValidateNonEmpty("Please enter a name for the section")] > > public virtual string Name { > > get { return name; } > > set { name = value.Trim(); } > > } > > } > > > And finally here is my view code generating the select: > > > <aspView:properties> > > <% > > IList<Section> sections = null; > > %> > > </aspView:properties> > > > <p><%=Helpers.Form.LabelFor("selectedSection", "Section:")%> < > > %=Helpers.Form.Select("selectedSection", sections, > > Helpers.Dict.CreateDict("text=Name", "value=Id", > > "firstoption=", > > "firstoptionvalue=0"))%></p> > > > I have tried setting the selected value on the FormHelper.Select > > method, but am having no luck whatsoever in finding what exactly is > > going on. This view code is designed to have none selected (ie > > selectedSection is a made up target which doesn't exist as an object), > > but I have used other complex objects which try to set the properties > > appropriately and sometimes succeed and sometimes throw exactly the > > same error. > > I should reiterate I think - it is consistently thrown on the same > > objects (ie the object id is 17), but works fine for other values/ > > selections. > > > Thanks so much for all of your help! > > -Brian -- You received this message because you are subscribed to the Google Groups "Castle Project Users" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/castle-project-users?hl=en.
