DataModel and DataModelSelection

[wschwendt]

One thing that I don't understand is why a @DataModelSelection annotation can ONLY be used in a component when there is also a @DataModel annotation placed on a field or getter method of this component ( Component.getDataModelSelectionName() enforces this).

What are the reasons for this requirement?

I think it would be very useful if @DataModelSelection could also be placed on a component even if this component doesn't expose a DataModel via the @DataModel annotation.


Of course, if @DataModelSelection was used in a component without an accompanying @DataModel annotation used in this component, it would be necessary to set the value attribute of @DataModelSelection to explicitly provide the context variable name the DataModel is bound to.

Any chances that the requirement could be lifted that @DataModelSelection needs an accompanying @DataModel annotation in the same component?

If not, we cannot really leverage the org.jboss.seam.framework package, if DataModel selection should be handled.

[wschwendt]

"wschwendt" wrote:

If not, we cannot really leverage the org.jboss.seam.framework package, if DataModel selection should be handled.

as a workaround, of course, the DataModel itself can be injected into an action component with "@In" instead of injecting the DataModelSelection with @DataModelSelection. Then, if we have access to the DataModel, we can get the selected row data and selected index.

Nevertheless, I'd like to know the reason for the requirement that @DataModelSelection can only be used if there is an accompanying @DataModel annotation in the same component.

[matt.drees]

Yeah, I've wanted this too. Often I'll have a search/listing page with delete buttons on each row. But I want to do the delete action in a different backing bean than the search backing bean, which has the @DataModel.

[wschwendt]

opened a fresh JIRA case
http://jira.jboss.com/jira/browse/JBSEAM-1895

[pmuir]

N.B. You can do

@In("#{dataModel.rowData}")
private Foo selectedFoo;

anywhere in Seam.