Struts will by default populate parameters in your action, if you use ModelDriven, then you can supply the object that will be populated instead of the action. Implementing preparable will make struts call prepare() before the action is executed, or prepareX() before X() is executed. They are just sometimes used together to achieve certain things, as explained on the other emails.
musachy On Jan 31, 2008 5:03 PM, Adam Hardy <[EMAIL PROTECTED]> wrote: > I don't think you are strictly conveying the intended usage, when you say that > the getModel() method will 'later' return the model. It depends how your > interceptor stack is ordered. In the docs, it explicitly says the > ModelDrivenInterceptor should come before ParametersInterceptor, as often the > PrepareInterceptor does. > > Both ModelDriven- and PrepareInterceptor can retrieve the model and place it > in > instance variables on the action. > > http://struts.apache.org/2.0.11/docs/prepare-interceptor.html > > http://struts.apache.org/2.0.11/docs/model-driven-interceptor.html > > What I originally wanted to ask (whether I conveyed my question correctly is > another matter) was: what's the difference in intention and implementation > between these two? > > Thanks > Adam > > Roberto Nunnari on 31/01/08 18:12, wrote: > > The prepare() method task is to retrive the model > > and store it as an instance variable. > > > > The getModel() method will later return the model > > when asked by the framework that will put it on the > > value stack. > > > > Please correct me if I'm wrong. > > > > > Adam Hardy wrote: > >> Dave Newton on 31/01/08 16:00, wrote: > >>> Adam Hardy <[EMAIL PROTECTED]> wrote: > >>>> Dave Newton on 31/01/08 15:29, wrote: > >>>>> Adam Hardy <[EMAIL PROTECTED]> wrote: > >>>>>> * ModelDriven: how do I get hold of my model during my action > >>>>>> methods? I > >>>>>> don't want to get getModel() again, because that will retrieve > >>>>>> another > >>>>>> instance of the entity and not the one that was populated by struts. > >>>>> Lazy initialization (via null check or by setting an instance var), or > >>>>> config through Spring, or... > >>>> If your getModel() puts the model entity on an instance variable, won't > >>>> that confuse the param interceptor? > >>> > >>> Depends on what instance variable you put it in, I suppose. One of your > >>> questions was how to access the model object w/o running through a > >>> getModel() > >>> method that would re-instantiate; lazily initializing an instance > >>> variable in > >>> getModel() then using that instance variable is one way of dealing > >>> with that. > >> > >> OK, that makes sense now, thanks. What I thought would be the more > >> obvious way of obtaining the model would be to fetch it from where > >> struts puts it when it calls getModel(), i.e. the value stack, however > >> I don't see any access methods for doing that, particulary on > >> ActionSupport. > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- "Hey you! Would you help me to carry the stone?" Pink Floyd --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
