S#arp Architecture: ASP.NET MVC with NHibernate

New Post: S#arp Architecture Compatibility

ddonovan — Tue, 19 Aug 2008 14:28:15 GMT

Thanks Billy. I got it working that way, though like I said, still had this strage reference to a .NET 3.5 library. Still not sure where it's coming from, but I'll post if I figure it out.
D

New Post: S#arp Architecture Compatibility

wmccafferty — Mon, 18 Aug 2008 13:23:43 GMT

Almost everything should work in VS2005 except the web layer and any LINQ stuff. Accordingly, you should create a new web layer within VS2005 and go from there.

Billy

New Post: Backup and Recovery Best Practices for Microsoft SQL Server 2005

cool7575 — Thu, 14 Aug 2008 16:47:44 GMT

Hi,

Some free IT magazines I found from net. Worth checking it.

Backup and Recovery Best Practices for Microsoft SQL Server 2005
http://softwareqatestings.tradepub.com/free/w_hp20

The Essential Guide to Solving Server Sprawl
http://softwareqatestings.tradepub.com/free/w_hp21

Optimizing HP Servers with Microsoft SQL Server 2008
http://softwareqatestings.tradepub.com/free/w_hp22

enjoy
Cool

New Post: S#arp Architecture Compatibility

ddonovan — Thu, 14 Aug 2008 05:38:01 GMT

I'm also trying to use this with VS 2005... I'd like to the the ProjectBase classes (specifically PersistentObject) as a base class for my domain objects in an existing VS 2005 project. Are there any workarounds? It seemed to be working until I tried to build on a clean box (without .NET 3.5 installed), then I ended up with a reference to System.Core version 3.5.0.0 in my web.config file. Any idea why this would be? All the References in ProjectBase were build to .NET 2.0 (or so VS says)... any help would be appreciated!
Thanks,
Dan
PS - Awesome stuff...

New Post: Anyone successfully using BindingHelperExtensions.UpdateFrom?

mcbsys — Sat, 09 Aug 2008 02:14:20 GMT

Hi Billy,

Thanks for the detailed reply!

I like the explicitness of the "WithTypedId<int>" suffix. Plus I'm still waffling on changing to Guid IDs.

You're absolutely right, when I set lazy="false", the object is no longer a proxy and the UpdateFrom works fine.

I haven't tried the Get() method yet. That may come in handy as I expect that I may _want_ to lazy load on occasion (e.g. data in tabbed controls), but not always.

The property-peek trick doesn't seem to work. Following in the debugger, I see that referencing a property does call the empty constructor on my POCO object. Does that mean NHibernate is pulling the data? In any case, it's not getting updated by UpdateFrom--perhaps because it is still proxied, even though the data is loaded? I guess I need to install SQL Profiler to follow what is really happening.

Thanks again for your help,

Mark

New Post: Anyone successfully using BindingHelperExtensions.UpdateFrom?

wmccafferty — Fri, 08 Aug 2008 23:19:22 GMT

Hi Mark,

Before discussing the BindingHelperExtensions, please don't that you don't need to inherit from PersistentObjectWithTypedID<int>; just inherit from PersistentObject which has a default ID type of int.

As for your question, based on how you described it, I assume you are doing the following in this order:

In the controller action which the form submitted to, you are using a DAO to load the object from the DB.
You're using UpdateFrom to then update the item loaded from the DB with values from the field.
You're encountering the above referenced error.

The reason that this is occurring is that, by default, NHibernate lazily loads objects. For example, assume you load a customer from the DB; NHibernate doesn't take the time to talk to the database and return data until you reference one of the properties or methods on the customer object. To facilitate this, NHibernate gives you a proxy object that tells NHibernate when it's time to actually hit the database. That's where Castle comes into play; NHibernate uses the Castle Proxy project to facilitate proxying. (To learn more about proxy objects with NHibernate, read http://www.hibernate.org/hib_docs/nhibernate/html/performance.html#performance-proxies .) Since UpdateFrom is using reflection to update the object's values, it's not kicking off the proxy's "time to talk to the database and load the real object" trigger. You have two options:

Add lazy="false" to the opening class tag within the object's HBM file. This will ensure that the object is not loaded lazily and will not give you an intermediary proxy.
Load the object from the database using NHibernate's Find() method. This method will never return a proxied object. I'll be sure to add this method to the generic DAO...but feel free to do so to your own code in the meantime.
Look at one of the properties or invoke a method on the object before your call to UpdateFrom. This will force NHibernate to replace the proxy with the actual object loaded from the database. (Not a very elegant solution.)

The first and second options are a bit cleaner; and as a nice side-effect, you won't have to add "virtual" before that object's properties and methods if you set lazy="false" in the class declaration.

BTW, the S#arp Architecture discussion group has moved to http://groups.google.com/group/sharp-architecture ...please request a membership and I'll approve it immediately.

Billy McCafferty

New Post: Discussion Group for S#arp Arch now at Google Groups...

wmccafferty — Fri, 08 Aug 2008 21:36:25 GMT

http://groups.google.com/group/sharp-architecture

Billy McCafferty

Updated Wiki: Home

wmccafferty — Fri, 08 Aug 2008 21:34:23 GMT

S#arp Architecture has moved...

To facilitate better integration with SVN clients, S#arp Architecture has been moved to Google Code at http://code.google.com/p/sharp-architecture. Additionally, a discussion group has just been setup on Google Groups at http://groups.google.com/group/sharp-architecture to support use of the architecture, discuss the ideas and patterns behind it, offer suggestions for improvement, and exchange ideas for using it in real-world applications.

No further releases will be made at this location.

Billy McCafferty

Updated Wiki: Home

wmccafferty — Fri, 08 Aug 2008 21:33:11 GMT

Updated Wiki: Home

wmccafferty — Fri, 08 Aug 2008 21:31:05 GMT

Commented Issue: CLS compliance

hangy — Fri, 08 Aug 2008 08:49:56 GMT

Making all ProjectBase assemblies CLSCompliant would help to avoid some warnings in my solution. Plus, having those published and shared assemblies CLSCompliant helps code quality a bit.
Comments: ** Comment from web user: hangy **

Might be good to add [assembly: CLSCompliant(true)] to each AssemblyInfo.cs. :)

New Post: Anyone successfully using BindingHelperExtensions.UpdateFrom?

mcbsys — Fri, 08 Aug 2008 00:39:20 GMT

I've got a little project set up with S#arpArchitecture 0.7.3. I'm trying to use System.Web.Mvc.BindingHelperExtensions.UpdateFrom to copy fields from a form into my object, which is a PersistentObjectWithTypedID<int>. Here's a post on how that is supposed to work:

http://weblogs.asp.net/fredriknormen/archive/2008/03/13/asp-net-mvc-framework-2-the-bindinghelper-class-ui-mapper.aspx

In my project, nothing is happening: no data is copied.

I see in the debugger that my object is a proxy using Castle.Core.Interceptor.IInterceptor. (I didn't know this framework used Castle!) There's also a reference to NHibernate.Proxy.Poco.Castle.CastleLazyInitializer. Is this proxy preventing UpdateFrom from mapping the fields between the form and the object? Is there some way to get it to work? Manually typing hundreds of field mappings over and over again is one thing I hoped to avoid with an ORM!

Thanks,

Mark

New Post: Moved to Google Code

wmccafferty — Thu, 07 Aug 2008 17:14:22 GMT

Google code allows you to connect directly via a SVN client without having to have an intermediary bridge service running. This is helpful when setting up a continuous integration env't.

New Post: Moved to Google Code

raidevnet — Thu, 07 Aug 2008 16:19:29 GMT

Why did you move to Google code? Just wondering if there are any benefits.

New Post: The Source

wmccafferty — Wed, 06 Aug 2008 14:52:42 GMT

Source is now located at http://code.google.com/p/sharp-architecture/

New Post: Moved to Google Code

wmccafferty — Wed, 06 Aug 2008 14:50:53 GMT

New location is http://code.google.com/p/sharp-architecture/

New Post: The Source

wmccafferty — Wed, 06 Aug 2008 13:44:07 GMT

Hi simone_b,

All source is currently provided in the release download; I'll move to Google code soon.

New Post: The Source

simone_b — Wed, 06 Aug 2008 07:40:22 GMT

Source please.

Updated Release: Version 0.7.3 with MVC Preview 4 and NH 2.0 CR1 (Aug 05, 2008)

Tue, 05 Aug 2008 13:00:07 GMT

The transition from MVC Preview 3 to Preview 4 is a very simple process, as was the upgrade from NH 2.0 Beta 1 to the CR1. Besides these, and the inclusion of the latest MVC Contrib 0.0.1.123 Beta, no other dependency changes were made to the source.

The home page now lists links to the various pages in the sample application and the documentation has been updated to describe running S#arp Architecture in a Medium Trust environment and elaborates a bit on (custom) collection best practices.

Released: Version 0.7.3 with MVC Preview 4 and NH 2.0 CR1 (Aug 05, 2008)

Tue, 05 Aug 2008 12:58:43 GMT

The transition from MVC Preview 3 to Preview 4 is a very simple process, as was the upgrade from NH 2.0 Beta 1 to the CR1. No other dependency changes were made to the source. The home page now lists links to the various pages in the sample application and the documentation has been updated to describe running S#arp Architecture in a Medium Trust environment and elaborates a bit on (custom) collection best practices.