Hi Stephan,
> Of course a user should not be assigned twice
> to a job.
This sounds like a valid use case for a Set rather than a List. To achieve this implement a reasonable equals-Method for User and rewrite your Job-class/your helper Bean DisplayJob to return a Set. As implementation of Set use a LinkedHashSet. This keeps the order of elements on each iteration. If you could even write a reasonable compareTo()-Method for User or alternatively a Comparator you would be able to use SortedSet and as implementation a TreeSet.
...
> <td t:type="loop" t:source="job.assignments" t:value="user"
> t:encoder="jobEncoder">
>
> <select t:type="select" t:id="job" t:model="userModel" t:value="user"
> t:encoder="userEncoder" blankLabel="Unassigned" />
>
> </td>
...
This looks to me as if you were displaying all users that are allready assigned to a Job in a select box. You´d need a select box with the UN-assigned users to make it possible to add new ones to the Job. This select box should be a multi select box. I have never done this myself so all I can do for you is point you to the wiki article:
http://wiki.apache.org/tapestry/Tapestry5MultipleSelectOnObjectsHope this helps, nillehammer
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