URI 段在 Codeigniter 中丢失

Question

On my codeigniter application, I have a list of users in which an admin can change the role of a user and update the user information. When editing a user the url is user/edit_user/1002 and the edit_user view is loaded. 1002 is the userid of the user.

When I submit the form and form_validation fails I reload the view but the problem is the last segment on the url with the userid is lost. So the sql queries used in the form fails. Is there a way I can reload the view with the errors and also keep the userid in the uri segment ? Given below is the code:

if ($this->form_validation->run() == FALSE) {

        $userid = $this->uri->segment(3);   
        $this->db->where('userid', $userid);
        $query = $this->db->get('user');
        $row1 = $query->row();      
        $data = (array)$row1;                                                   

        $sql = "SELECT userid, role_id FROM user_role WHERE userid = $userid ";// This sql fails
        $ro = $this->db->query($sql);

        $data['role_check'] = $ro->result(); 
        $this->load->view('edit_user',$data);   
}   

Thanks in advance.

In view_user.php,

    <tr>
        <td><?php echo $loop->userid;?></td>
        <td><?php echo $loop->name;?></td>                      
        <td><a class="btn-small btn-info" href="<?php echo site_url(); ?>/user/edit_user/<?php echo $loop->userid;?>">Edit</td>

    </tr>

The in controller user, I have used the code I posted first.

Answer 1

Add the user id in the form's action.

Something like this:

action="user/edit_user/<?php echo $this->uri->segment(3); ?>"

Answer 2

I have solved the problem myself and sharing it in case someone else faces this problem. Going through the CI docs, I found that the function returns FALSE if the segment does not exist. I have used it to cover all the conditions that an update may face. The code is given below:

  if($this->uri->segment(3))
        {   $userid = $this->uri->segment(3);   
            $this->session->set_userdata('update_user_id',$userid);
        }               
        else            
            $userid= $this->session->userdata('update_user_id');    

In case of revalidation of the form, $this->uri->segment(3) will return FALSE and the else condition will pick the userid from session which was set when the form was first populated by clicking EDIT link.

Thank you all.