所以我不知道这是我的控制器还是CodeIgniter Framework中的模型出了什么问题，请提供帮助。我的表在我的视图中没有从数据库中获取数据。

我已经尝试了我在stackoverflow中看到的所有内容，但是我无法使其正常工作，但这是我的原始代码。

这是我的控制器：

public function index(){

    $data['suppliers'] = $this->dashboard_model->readSupplier();
    $data['items'] = $this->dashboard_model->readItem();
    $data['users'] = $this->dashboard_model->readUser();
    $data['units'] = $this->dashboard_model->readUnit();
    $data['logs'] = $this->dashboard_model->readLogs();

            $this->global['pageTitle'] = 'Dashboard';
            $this->loadViews("pages/dashboard",$this->global,$data);

这是我的模型：

class Dashboard_model extends CI_Model{

        function readSupplier(){
            $this->db->from('suppliers');
            $this->db->limit(5);
            $this->db->order_by('supplier_id','DESC');
            $query = $this->db->get();
            $result = $query->result();
            return $result;
        }

        function readItem(){
            $data = array(
                'categories.category_name','items.item_id','items.category_id','items.brand_name','items.model','items.serial','items.unit_price','items.status','items.location_id','suppliers.supplier_id','suppliers.supplier_name'
            );
            $this->db->select($data);
            $this->db->from('items');
            $this->db->join('categories','categories.category_id = 
            items.category_id','left');
            $this->db->join('suppliers','suppliers.supplier_id = 
            items.supplier_id','left');
            $this->db->limit(10);
            $this->db->order_by('item_id','DESC');
            $query = $this->db->get();

            $result = $query->result();
            return $result;
}

        function readUser(){
            $this->db->from('users');
            $this->db->limit(10);
            $this->db->order_by('userId','DESC');
            $query = $this->db->get();
            $result = $query->result();
            return $result;
        }

        function readUnit(){
            $data = array(
                'l.location_name','su.su_id','su.unit','su.motherboard','su.processor','su.ram','su.hdd','su.video_card','su.lan_card','su.power_supply','su.location_id','su.comment',);
            $this->db->select($data);
            $this->db->from('system_unit as su');
            $this->db->join('locations as l','l.location_id=su.location_id','left');
            $this->db->limit(10);
            $this->db->order_by('unit','DESC');
            $query = $this->db->get();
            $result = $query->result();
            return $result;
        }

        function readLogs(){

            $this->db->from('activities as a');
            $this->db->join('users as u','u.userId=a.userId','left');
            $this->db->limit(10);
            $this->db->order_by('userId','DESC');
            $query = $this->db->get();

            $result = $query->result();
            return $result;
    }
?>

这是我的视图：

    <th>User ID</th>
    <th>Full Name</th>
    <th>Email</th>
    </thead>
    <tbody>
    <?php
        if(!empty($users)):
            foreach($users as $user): ?>
    <tr>
    <td><?php echo $user->userId; ?></td>
    <td><?php echo $user->firstname." ".$user->lastname; ?></td>
    <td><?php echo $user->email; ?></td>
    </tr>
           <?php endforeach;
           endif;
           ?>