[jboss-user] [JBoss Seam] - Re: dynamic filtering of resultlists

[ellenzhao]

I would take this approach:

make a collection of lectures in the semester entity like this:


  | @Entity
  | @Name("semester")
  | ...
  | public class Semester implements Serializable{
  | ...
  | 
  | //I assume the semester and lecture is n:n so needing a linking entity called
  | // SemesterXLecture
  | private Set<SemesterXLecture> lectures;
  | 
  | @OneToMany    // lazy or eager as you wish, I would prefer eager here 
  | ...
  | public Set<SemesterXLecture> getLectures(){
  |   return this.lectures;
  | }
  | }
  | 

Then, in one of your conversation beans, load all Semesters and cache them. Then, you can use 


  | aSemester.getLectures();
  | 

anywhere in your conversation beans. You can also hood a semester in your xhtml file and use it similar to this code: 


  | <h:dataTable value="#{someManager.semester.lectures}" var="lecture">
  | <h:column>
  | <h:outputText value="#{lecture.desc}" />
  | </h:column>
  | ...
  | </h:dataTable>
  | 

so the lecture changes "dynamically" if you change the semester.


Regards,
Ellen

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