CodeIgniter权限管理：解决复选框数据插入数据库失败的问题

public function permission()
{
    // 第一次加载页面或表单验证失败时显示表单
    if ($this->form_validation->run() == FALSE)
    {
        $main['permissions']=$this->users_model->get_permission_array();
        $main['roles']=$this->users_model->get_roles_array();
        foreach($main['roles'] as $key => $val):
        $main['access'][$val['roles_id']]=$this->users_model->get_access_array(array('roles_id'=>$val['roles_id']));
        endforeach;
        $main['page'] = 'crm/users/permission';
        $this->load->view('crm/index', $main);
    }

    // 表单提交处理逻辑
    if($this->input->post())
    {
        $loginid=false; // 用于判断插入是否成功的标志
        // 关键问题：如果 form_validation.run() 返回 TRUE，则 $main['roles'] 未定义
        foreach($main['roles'] as $key => $val): 
            if(isset($_POST['roleid'.$val['roles_id']])){ 
                $this->users_model->clear_access(array('roles_id'=>$val['roles_id']));  
                foreach($_POST['roleid'.$val['roles_id']] as $id => $access): 
                    $data=array('roles_id'=>$val['roles_id'],'permissions_id'=>$access); 
                    $loginid=$this->users_model->permission_access($data);              
                endforeach;         
            }
        endforeach;

        if($loginid){ // 此处只检查了最后一次插入的结果
            $this->session->set_flashdata('message', '<p>Permission updated Successfully.</p>');
            redirect('users/permission');
        } else {
            $this->session->set_flashdata('message', '<p>Error!! - Permission not updated.</p>');
            redirect('users/permission');
        }
    }
}

function get_permission_array()
{
    $query = $this->db->get("crm_client_permissions");
    return $query->result_array();
}

function get_access_array($cond)
{
    $this->db->select("permissions_id");
    $this->db->where($cond);
    $query = $this->db->get("crm_client_role_access"); // 注意这里是 crm_client_role_access
    return $query->result_array();
}

function clear_access($cond)
{
    return $this->db->delete("crm_clients_access",$cond); // 注意这里是 crm_clients_access
}

function permission_access($data)
{
    return $this->db->insert("crm_clients_access",$data); // 注意这里是 crm_clients_access
}

function get_roles_array($cond='')
{
    if($cond !='') $this->db->where($cond);
    $query = $this->db->get("crm_client_roles"); 
    return $query->result_array();  
}

<div <?php echo form_open_multipart('users/permission'); ?>>
<table>
<?php if($permissions) $i=0;foreach($permissions as $key => $permission): ?>
          <tr>
            <td class="align-center"><?php echo ++$i; ?></td>
            <td><?php echo $permission['page']; ?></td>
            <td><?php echo $permission['url']; ?></td>
            <?php foreach($roles as $rolekey => $role): 
              if($role['roles_id'] == 1)$checked = 'checked'; // 角色ID为1默认选中
              if(in_array($permission['permissions_id'],array_map('current',$access[$role['roles_id']])))
              $checked = 'checked';
              else
              $checked = ''; ?>
            <td align="center"><div class="checkbox checkbox-success m-t-0"><input type="checkbox" class="accessbox"
            id="role<?php echo $rolekey ?>-<?php echo $key ?>" name="roleid<?php echo $role['roles_id']; ?>[]" 
            <?php echo $checked?> <?php echo ($role['roles_id'] == 1) ? 'disabled="disabled"' : '' ?>   value="<?php  echo $permission['permissions_id']; ?>" />
            <label for="role<?php echo $rolekey ?>-<?php echo $key ?>"></label></div></td>
            <?php endforeach; ?>
          </tr>
          <?php endforeach; ?>
      </table>
      <div class="text-center">
        <button type="submit" class="btn btn-info">Save Permission</button> <a href="<?php echo site_url('users/roles') ?>" class="btn btn-warning">Cancel</a>
      </div>
      <?php echo form_close(); ?> </div>

public function permission()
{
    // 确保无论表单提交与否，这些数据都已加载
    $main['permissions'] = $this->users_model->get_permission_array();
    $main['roles'] = $this->users_model->get_roles_array();
    foreach($main['roles'] as $key => $val):
        $main['access'][$val['roles_id']] = $this->users_model->get_access_array(array('roles_id'=>$val['roles_id']));
    endforeach;

    if ($this->form_validation->run() == FALSE)
    {
        // 第一次加载页面或表单验证失败时显示表单
        $main['page'] = 'crm/users/permission';
        $this->load->view('crm/index', $main);
    }
    else // 表单提交且验证通过
    {
        $all_inserts_successful = true; // 初始化为成功
        foreach($main['roles'] as $key => $val):
            // 每次循环前，清除当前角色的旧权限
            $this->users_model->clear_access(array('roles_id'=>$val['roles_id']));  

            // 如果该角色有提交的权限
            if(isset($_POST['roleid'.$val['roles_id']])){ 
                foreach($_POST['roleid'.$val['roles_id']] as $id => $access): 
                    $data = array('roles_id'=>$val['roles_id'],'permissions_id'=>$access); 
                    // 执行插入，并检查结果
                    if (!$this->users_model->permission_access($data)) {
                        $all_inserts_successful = false; // 任何一次插入失败都标记为失败
                        // 可以选择在此处记录日志或中断循环
                        // break; // 如果希望在第一次失败时立即停止
                    }
                endforeach;         
            }
        endforeach;

        if($all_inserts_successful){
            $this->session->set_flashdata('message', '<p>Permission updated Successfully.</p>');
            redirect('users/permission');
        } else {
            $this->session->set_flashdata('message', '<p>Error!! - Permission not updated.</p>');
            redirect('users/permission');
        }
    }
}