Hello!
I am trying to create a simple use-case with Tapestry components, but I
am unsure how to handle this correctly. Perhaps someone knows a solution.
The site is used to assign users to jobs. Each job has a java.util.List
of users assigned to it. Of course a user should not be assigned twice
to a job. So basically my class should look like
public class Job {
private String title;
private List<User> assignments;
... getter/setter ...
}
Unfortunately the List is not part of the class, I have to get it
directly from the database. So I wrote a helper bean class DisplayJob
which contains the assignments.
Now I want to create a page that displays all jobs and for each job the
assigned users. My first try is a table with
-----
<tr t:type="loop" t:source="jobs" t:encoder="jobEncoder" t:value="job">
<td>${job.title}</td>
<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>
</tr>
-----
All jobs and select boxes are drawn as expected, but now I am stuck.
After submitting the form the values reset, job.assignments is never
changed. Also I am unable to validate if a user has been assigned twice
or more to a job.
JobEncoder creates a new DisplayJob, reading the assignments from the
database, so the data is of course not changed. But where is the place
to change the database?
Does anyone know how I can accomplish this task? Or is it even possible
to display the data in a Grid component?
TIA
Stephan
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