致命錯誤調用成員函數result（） - 代碼點火器

Question

看起來像這裏常見的這個錯誤發生，看着答案我仍然無法弄清楚爲什麼我得到一個錯誤。

我收到錯誤

Fatal error: Call to a member function result() on a non-object on line 83

線問題涉及的控制器這個功能 - 這是什麼產生錯誤。

$this->view_data['categories'] = $my_categories->result();

功能如下..

function _load_search_options() 
{ 
    // Get all the categories for the advanced search page 
    $my_categories = $this->Categories_model->get_all(); 
    $this->view_data['categories'] = $my_categories->result(); 

    // Get all the PRIMARY colours from teh tbl_colour_options 
    $my_colour_options = $this->Colours_model->get_all_primary(); 
    $this->view_data['colour_options'] = $my_colour_options->result(); 


    // Get all the colours from teh tbl_colour_options 
    $my_colour_options_all = $this->Colours_model->get_all(); 
    $this->view_data['colour_options_all'] = $my_colour_options_all->result(); 
} 

我的模型如下...

function get_all() 
{ 
    $query_str = " 
     SELECT * 
     FROM categories 
     WHERE CATEGORIES_parent_id = 0 
    "; 

    $results = $this->db->query($query_str); 
    $parents = $results->result(); 

    foreach ($parents as $parent) 
    { 
     $children = array(); 

     $query_str = " 
      SELECT * 
      FROM categories 
      WHERE CATEGORIES_parent_id = '$parent->CATEGORIES_id' 
     "; 

     $children_results = $this->db->query($query_str); 
     $children_results = $children_results->result(); 

     foreach($children_results as $children_result) 
     { 
      $children[$children_result->CATEGORIES_id] = $children_result->CATEGORIES_title; 
     } 

     $categories[$parent->CATEGORIES_title] = $children; 




    } 

    return $categories; 
} 

值得一提的是運行在MySQL自身的SELECT查詢就會通過一些結果。

Answer 1

函數get_all不返回數據庫對象（資源）。

get_all函數中的$categories變量被定義爲一個數組。

您無法將其作爲對象訪問或調用results函數。