Can't filter using backing bean - jsf

Question

I'm trying to filter a column using backing bean function.
<p:dataTable id="cars"
var="car"
value="#{manageAllCoursesBean.courses}"
filteredValue="#{manageAllCoursesBean.filteredCourse1}">
<f:facet name="header">
<p:outputPanel>
<p:inputText id="globalFilter"
onkeyup="PF('carsTable1').filter()"
style="width:250px"
placeholder="Entrer un mot clé"/>
</p:outputPanel>
</f:facet>
<p:column headerText="Name"
filterBy="#{car.name}"
sortBy="#{car.name}"
style="color: #400040; font-size: 10px; width: 150px; text-align:center">
<h:outputText value="#{car.name}" />
</p:column>
<p:column headerText="Teacher"
filteredBy="#{manageAllCoursesBean.findTeacherByIdCourse(car.id)}"
sortBy="#{manageAllCoursesBean.findTeacherByIdCourse(car.id)}"
style="color: #400040; font-size: 10px; width: 175px; text-align:center">
<h:outputText value="#{manageAllCoursesBean.findTeacherByIdCourse(car.id)}" />
</p:column>
</p:dataTable>
the backing bean method is:
public String findTeacherByIdCourse(String courseId) throws IOException
{
return serviceManager.findTeacherByCourseId(courseId);
}
the filter with Name is working as well.
However, is not the case with Teacher.
Have you please any idea about solving that ?.
Big thanks.

Answer 1

As described on Primefaces showcase, there's no way to use managed bean method with filterBy under p:column.
I proposed that solution:
You can convert your entity Course to a courseModel and then add teachers as a list of strings.
then in your managed bean will be :
List<CourrierModel> lacmss = new ArrayList<CourrierModel>();
DataModel allDatasAssociatedCE = new ListDataModel();
//...
allDatasAssociatedCE.setWrappedData(lacmes);
for(Course c: courses)
{
CourseModel cme = new CourseModel();
cme.setCourse(c);
cme.setTeachers(findTeacherByIdCourse(c));
lacmss.add(cme);
}
HTH.