app.js

      /*
      * Method ajax for canal and medio 
      */
      $('#hospital_id').change(function(){
          var data = "";
          var url = $(this).data('url');          
          var params = 'hospital_id=' + $('#hospital_id').val();          
          $.ajax({
              type    : "GET",
              url     : url,
              data    : params,
              async   : true,
              success : function(data) {                   
                  console.log(data.room_options)  
                  var medio = $('#medio');
                  medio.find('option')
                       .remove()
                  $.each(data.room_options, function(key, value) {   
                       $('#medio')
                           .append($("<option/>")
                                 .attr("value",key.room_options)
                                 .text(value.name).val(value.id));
                        $('#medio').select2();
                  });           
              },
              error : function() {
                  alert ('Ha ocurrido un error');
              }
          });
      });