Yes, it most certainly does work!
Firstly, I would use 1.1b3 if at all possible.
In order to properly use the <nested> tags you have to tell it the root context.
There are a few ways of achieving this; the simplest case is if your <nested> tags are
within the scope of a <nested:form>. In this case all the <nested> tags within
"inherit" the form-bean associated with the form.
While I understand that a UserForm has a collection of UserPrefForm objects, I'm not
sure I understand the relationship between User, Preferences and UserForm. So,
working under the premise that an object of type UserForm is the form-bean for the
action associated with the form,
<nested:form action="/someAction.do">
<%-- print the userFormName property of UserForm --%>
<nested:write property="userFormName"/>
<%-- Iterate over all the UserPrefForms --%>
<nested:iterate property="userPrefForms">
<%-- The context within this loop is *a* UserPrefForm --%>
<nested:text property="somePref"/>
<nested:text property="someOtherPref"/>
</nested:iterate>
</nested:form>
Like with "normal" Struts tags, property="foo" results in a call to the method
getFoo() of the appropriate bean. Submitting this form *will* result in the
properties being updated correctly.
Whether you work with a form-bean or use the <nested:root> tag to specify the bean, it
is imperative that the bean be available in some scope with the proper key.
Hope that helps
Sri
> -----Original Message-----
> From: Sundar Narasimhan [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, February 05, 2003 11:37 PM
> To: [EMAIL PROTECTED]
> Subject: nest sytax.. looks cool but does it work? :)
>
>
> I finally gave up w/ 1.0 and moved to 1.1b2 (the one that
> comes w/ WSAD).
>
> And the first thing I try w/ it doesn't work, so I must have
> the wrong model again. So here goes;
>
> I have a top level User -- who has a bunch of Preferences.
> There is a UserForm, and a UserPrefForm. The UserForm has a
> collection of UserPrefForm, and in addition has a property
> called "selectedPref" which actions set to one of the
> UserPrefForms. (The reason I want to do this is simple: I
> want to display a table with all the UserPrefForms in summary
> form, and when the user clicks on a Preference to display the
> detail along with the form). The trouble is how can I display
> a UserPrefForm's fields when I'm displaying a User? So I
> think <nested> can help. 1. I first try
> <nested:text property="selectedPref.someField"> </nested:text>
> Doesn't work -- PropertyUtils.throw an IllegalArgument exception --
> No bean specified.
> 2. I then try
> <nested:nest property="selectedPref"
> <html:text property="someField">...
> </nested:nest>
> and
> <nested:nest property="selectedPref"
> <nested:text property="someField">...
> </nested:nest>
> nada ..
> 3. Then I think.. hmm I did read something about "root" and
> maybe that's needed to set the scoping right..
> <nested:root name="selectedPref">
> <...>
> </nested:root>
> Now I get "selectedPref" not found in any scope!
>
> How is this supposed to work!!!
> Frustrated.
>
> p.s. do I have the right model here.. that if I use the
> nested tag, and invoke the action (say Save), the populate
> process in struts will find the appropriate "selected"
> preference and save the nested fields "in" the selected form.
> Note that this is what the document seems to imply with all
> the discussion of bananas and monkeys.. does the code not
> correspond to the documentation? (I was assuming that I'd get
> bi-directional transfer.. i.e. from the forms to the jsp, and
> vice-versa.. i.e. jsp to actions to the forms -- and that
> such master-detail traversals are what nesting was designed for).
>
> If I have this wrong, or if the implementation is just plain
> not working yet, please could someone let me know.
>
> Thanks.
>
>
>
>
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