How to show results in a list Grails gsp -

i have student class has relationship one-to-many note class

class student {    string name    static hasmany = [notes: note] }  class note {     double note     int bimester     static belongsto = [student:student] } 

when display result user in usernotes.gsp shown: use: <g:each var="n" in="${studentinstance.notes}">

discipline    note  bimester mathematics | 0    |   1 mathematics | 0    |   2 mathematics | 0    |   3 mathematics | 0    |   4 portuguese  | 0    |   1 portuguese  | 0    |   2 portuguese  | 0    |   3 portuguese  | 0    |   4 

but wanted show following:

discipline | bimester 1 | bimester 2 | bimester 3 | bimester 4 mathematics      0            0            0            0 portuguese       0            0            0            0 

you can group data in controller:

def usernotes() {    def student = student.get(1)    def disciplines = [:].withdefault { [0, 0, 0, 0] }    (note note in student.notes.sort { it.bimester }) {        disciplines[note.discipline].set(note.bimester - 1, note.note)    }    [disciplines: disciplines] } 

and display with

<table>     <thead>         <tr>             <th>discipline</th>             <th>bimester 1</th>             <th>bimester 2</th>             <th>bimester 3</th>             <th>bimester 4</th>         </tr>     </thead>     <tbody>     <g:each in="${disciplines}" var="entry">         <tr>             <td>${entry.key}</td>             <g:each in="${entry.value}" var='bimester'>             <td>${bimester}</td>             </g:each>         </tr>     </g:each>     </tbody> </table>