Hi i am trying to fetch data from database into my dropdown menu in codeigniter, but havind error of 'undefined variable: unit_name' .
this is my model file

`public  function get_unit_value() { 
    $result = $this ->db ->select('id, unit_name') -> get('units') -> result_array(); 

    $unit_name = array(); 
    foreach($result as $r) { 
        $unit_name[$r['id']] = $r['unit_name']; 
    } 
    $unit_name[''] = 'Select unit...'; 
    return $unit_name; 
    }` 

this is my controller

    `public function unit(){
      $this->load->database();
        $this->load->model('client_model');

        $data['unit_name'] = $this ->client_model-> get_unit_value(); 

        $this -> load -> view('add_quote', $data); 
    }`

this s my view file
<div class="panel panel-default"> <div class="panel-heading">The form</div> <div class="panel-body"> <!--dropdown input--> <?php echo form_dropdown('unit_name',$data['unit_name'], '', 'class="form-control"');?> <br> <br> <button type="submit" class="btn btn-info">Submit</button> </div>

If i made any mistake please let me know because i am having trouble to find any error in the code