jboss seam @Datamodel

[ypasmk]

I want to outject an ArryList so I have this in my ejb

@DataModel
private List<myEntity> ents=new ArrayList<myEntity>();

and this code in my jsf page

<h:dataTable value="#{listAgents}" var="report">
....#{report.id}
</h:dataTable>

and it's working..But myEntity has an ArrayList component inside it which is mapped as OneToMany like this

@Entity
public class myEntity{

....
private List<otherEntity> other;


@OneToMany
public List<otherEntity getOther() {
....
}

}

so my question is how can I outject like myObject.getOther().get(0).getName(); in my jsf pages?

[pmuir]

You can use a datatable/ui:repeat etc. on a plain list. You just don't get @DataModelSelection.

[yj4jboss]

Hello Peter,
Is there a way of getting DataModelSelection working with this i.e a DataTable within another DataTable ??

Regards,
Jankee Yogesh
http://www.m-itc.net

[pmuir]

AFAIK no. To use @DataModelSelection you must outject a JSF DataModel (@DataModel wraps your List in a DataModel automagically). I suspect you could do it manually but it would take some playing with Seam/JSF.

[bpatters]

I got rid of all my code that used @datamodelselection in favor
of using the parameter seam 1.1 supports.

Now I use:

<h:dataTable var="i" value="#{datalist}">
 <h:column>
 <h:commandButton action="#{dataManager.selectItem(i)}" value="select #{i.name}"/>
 </h:column
</h:dataTable>

This works really well, especially if you have nested tables, you can pass
the current table row selection into the function as multiple parameters
using:

<h:dataTable var="i" value="#{datalist}">
 <h:column>
 <h:dataTable var="j" value="#{i.subdatalist}">
 <h:column>
 <h:commandButton action="#{dataManager.select
SubItem(i,j)}" value="select #{j.name}"/>
 </h:column
 </h:dataTable>
 </h:column
</h:dataTable>

Of course this requires you to use Facelets and seam 1.1 with the seam FaceletViewHandler, but it REALLY simplifies things alot.

[pmuir]

Nice. You should put that on the wiki as a tip :)

[supernovasoftware.com]

That rocks. Now I will have to switch to seam 1.1 I have been dying to nest tables and it was unclear to me how to do so with datamodel selection. A wiki tip would be most helpful.

[bpatters]

"supernovasoftware.com" wrote:
That rocks. Now I will have to switch to seam 1.1 I have been dying to nest tables and it was unclear to me how to do so with datamodel selection. A wiki tip would be most helpful.

I'll write something up once I get home and have access to my code etc. The above is how I did it last night from memory. I too was having problem figuring out how to @DataModelSelection with nested tables, when I figured I'd just use this technique. The whole selected item being injected from a model thing is hard for me to get my mind around in complex scenarios, but the pass this occurrence of the iteration as a parameter is very easy for me to fit into my way of thinking :)

[iradix]

That really is cool. It makes you wonder what the JSF spec leads were thinking to not allow action parameters in the first place.

[gavin.king]

In this case it is the fault of the JSP spec group. (JSTL-EL)

[jjarkko]

I've been using the selectionIs there any additional benefits if you use @DataModel vs. "direct" selection through parameter?
Simply put, is @DataModel deprecated?

[jjarkko]

Eh, maybe i meant to ask that is @DataModelSelection deprecated/unneeded.

[gavin.king]

No it is not deprecated.