title: No such property: id for class: java.lang.String
body: <p>I am sending the employee object from the Project_level controller to the _add_members view and then from there I am sending the employee object to the Project_permission controller. while saving the id the following error is coming: No such property: id for class: java.lang.String in the line :proj_permission.setId_of_employee(emp.id)</p>
  
  <pre><code>class Project_levelController {
  
     def auth_after_create_level(){
     //creating a level under the above level
  
        def res=Project_level.findByLevel_nameAndLevel_no(params.level_name,params.level_no)
     //   def res=null
        if(res)
        {
           flash.message='level name has already been taken'
           redirect(action:'_right')
        }
        else{
           if(params.enter=="NEXT")
           {
              def proj_lev_right = new Project_level_right(params["project_level_right"])
              proj_lev_right.save()
              proj_lev_right.errors.allErrors.each { println it }
              session.proj_lev_right = proj_lev_right
  
              def proj_lev = new Project_level(params["project_level"])
              proj_lev.setProj_lev_right_id("${proj_lev_right.id}")
              proj_lev.id_of_project=session.id_of_project
              proj_lev.mem_added = 0
              proj_lev.save()
              proj_lev.errors.allErrors.each { println it }
              session.proj_lev = proj_lev
  
              def emp = Employee.findAllByLevel(proj_lev.level_no)
  
              render(view: "add_members", model: [proj_lev:proj_lev , proj_lev_right:proj_lev_right , employee:emp])
           }
        }
     }
  
     def _right(){
     }
  }
  
  /*****************************************************************************/
  
  class Project_permissionController {
  
  
  def add_employee_to_project()
  {
     def emp = params.employee
     def proj_permission=new Project_permission()
     proj_permission.id_of_project=session.id_of_project
     proj_permission.setId_of_employee(emp.id)
     proj_permission.id_of_poject_level=session.proj_lev.id
  
     /*      def employee_proj_level= Project_level.get(proj_permission.id_of_project_level)//making a empty project_project and saving the project level field that belong to id_of_project_level
     def employee_proj_level_right= new Project_level_right()//making a empty project_level_right
     employee_proj_level_right= Project_level_right.get(employee_proj_level.proj_lev_right_id)//empty project_level_right is used to store the default right for that particular level that is given by "proj_lev_right_id"
  
     proj_permission.setId_of_project_level_right("${employee_proj_level_right.id}")//saving employee project_level_right in id_of_proj_level_right
  */
     proj_permission.id_of_project_level_right=session.proj_lev_right.id
     render "Hari"
  }
  
  
  /**********************************************************/
  
  &lt;g:each var="emp" in="${employee}"&gt;
     &lt;g:link controller="project_permission" action="add_employee_to_project" params="[employee:emp]"&gt;
        &lt;button class="btn btn-block btn-info btn-sm"&gt;Add to Project&lt;/button&gt;
     &lt;/g:link&gt;&lt;/td&gt;
     &lt;/a&gt;
     &lt;/div&gt;
     &lt;/div&gt;
     &lt;/div&gt;
  &lt;/g:each&gt;
  &lt;/ul&gt;
  &lt;/div&gt;
  &lt;/div&gt;
  &lt;/div&gt;&lt;!-- /.box-body --&gt;
  &lt;/div&gt;&lt;!-- /.box --&gt;
  </code></pre>