Re: [Webware-discuss] Re: Mix-ins

[Tom S. <tom...@li...>]

Chuck Esterbrook wrote:
> 
> At 04:04 PM 3/20/2001 +0100, Tom Schwaller wrote:
> >I'm trying to find ou where you used
> >this aproach in Webware, so I get a better feeling for it..
> 
> Webware.MiddleKit.Core.ModelUser
> 
> Read the methods that start with "install".
> 
> So what is a model user? It is one of three things:
>    1. Python code generator
>    2. SQL code generator
>    3. SQL object store
> 
> The first 2 are found in MiddleKit.Design. The last in MiddleKit.Run.
> 
> My aim here was that the generators and stores need to customize the core
> classes and should do so without changing the source of core.
> 
> There is a reason, why I didn't use subclasses. "Model user" objects
> already let the user pass in custom subclasses for the core classes (Model,
> Klass, Attr, IntAttr, ...) and I didn't want to burden the user with having
> to remember to subclass something like:
>      MiddleKit.Design.MySQLPythonGenerator.Attr
> 
> as opposed to:
>     MiddleKit.Core.Attr.Attr
> 
> The latter is cleaner, more consistent and doesn't change when you switch
> adapters/databases.
> 
> Hope that gets you started.

definitively. thanks a lot. The methods you use in this class

modulesForClass
installMixInsForModule
installMixIns

are quite generic and could be used at other places too.
Is that correct?


-- 

Tom Schwaller
http://www.linux-community.de