我在数据表中添加了分页，但某些列数据未搜索

Question

在我的模型中，我加入了branch from数据之后却又加入了其他表to，但是没有成功搜索并且其他数据搜索成功。

视图：

<section class="content">
              <table id="example1"  class='display dataTable'>
                <thead class="bg-info">
                <tr>
                  <th>Dispatch Challan No</th>
                  <th>Date</th>
                  <th>From</th>
                  <th>To</th>
                  <th>Lorry No.</th>
                  <th>Pan Card</th>              
                  <th>Driver</th>
                  <th>Owner</th>
                  <th>Remark</th> 
                 </tr>
               </thead>
              </table>
    </section>
  </div>
  <script type="text/javascript">
     $(document).ready(function(){
        $('#example1').DataTable({
          'processing': true,
          'serverSide': true,
          "bInfo": false,
          'serverMethod': 'post',
          'ajax': {
             'url':'<?php echo base_url();?>booking/dispatch_challan/DispatchChallanController/getData'
          },

          'columns': [
             { data: 'disp_ch_no' },
             { data: 'disp_ch_date' },
             { data: 'from' },
             { data: 'to' },
             { data: 'vehicle' },
             { data: 'disp_ch_pan' },
             { data: 'disp_ch_driver' },
             { data: 'disp_ch_owner' },
             { data: 'disp_ch_remark' },
          ]
        });
     });
     </script>

控制器：

 public function getData()
  { 
           // POST data
           $postData = $this->input->post();
           $data = $this->dispatchModel->viewData($postData);
           echo json_encode($data);
  }

型号：

function viewData($postData=null){
     $response = array();
     ## Read value
     $draw            = $postData['draw'];
     $start           = $postData['start'];
     $rowperpage      = $postData['length']; // Rows display per page
     $columnIndex     = $postData['order'][0]['column']; // Column index
     $columnName      = $postData['columns'][$columnIndex]['data']; // Column name
     $columnSortOrder = $postData['order'][0]['dir']; // asc or desc
     $searchValue     = $postData['search']['value']; // Search value

    ## Search 
     $searchQuery = "";
     if($searchValue != ''){

         $searchQuery = " (b.disp_ch_no like '%".$searchValue."%' or b.disp_ch_date like '%".$searchValue."%' or b.disp_ch_from like'%".$searchValue."%' or b.disp_ch_to like'%".$searchValue."%' or b.disp_ch_lorryno like'%".$searchValue."%' or b.disp_ch_pan like'%".$searchValue."%' or b.disp_ch_driver like'%".$searchValue."%' or b.disp_ch_owner like'%".$searchValue."%' or b.disp_ch_remark like'%".$searchValue."%') ";
     }

     if($searchValue != '')
     $this->db->where($searchQuery);
     $records = $this->db->get('dispatch_challan b')->result();
     $this->db->select('bn.branch_name as from_branch_name,bn1.branch_name as to_branch_name,vn.vehicle_no as vehicle,b.*,vn.*,');
             $this->db->from('dispatch_challan b');
             $this->db->join('vehicle vn', 'b.disp_ch_lorryno=vn.vehicle_id','left');
             $this->db->join('branch  bn', 'b.disp_ch_from=bn.branch_id','left');
             $this->db->join('branch  bn1','b.disp_ch_to=bn1.branch_id','left');
             $this->db->where('b.status','active');

     if($searchValue != '')
     $this->db->where($searchQuery);
     $this->db->order_by($columnName, $columnSortOrder);
     $this->db->limit($rowperpage, $start);

     $records = $this->db->get()->result();

     $data = array();
     foreach($records as $record ){

        $data[] = array( 
           "disp_ch_no"          =>$record->disp_ch_no,
           "disp_ch_date"        =>$record->disp_ch_date,
           "from"                =>$record->from_branch_name,
           "to"                  =>$record->to_branch_name,
           "vehicle"             =>$record->vehicle,
           "disp_ch_pan"         =>$record->disp_ch_pan,
           "disp_ch_driver"      =>$record->disp_ch_driver,
           "disp_ch_owner"       =>$record->disp_ch_owner,
           "disp_ch_remark"      =>$record->disp_ch_remark
        ); 
     }
     ## Response
     $response = array(
        "draw" => intval($draw),
        "aaData" => $data
     );
     return $response; 
   }