php - Codeigniter Update Record - Unable to update in database -

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i'm trying update record in ci project. can deal form validation later. right i'm trying address inability update record in database.

i'm using template pages , placing content. appreciated.

model updating record

 public function up_ct_acct($id, $sus)   {    $this->db->where('user_id',$id);     $this->db->update('users',$sus);   }

controller form view , action

//for page view public function update_profile($id, $datum) {     //the username on url.    $id = $this->uri->segment(3);        $datum['user_profile'] = $this->user_model->get_da_profile($id);    //using template pages    $content['main_content'] = $this->load->view('users/update_profile',$datum);     $this->load->view('main',$content);  }  //action update  public function up_sup_acct()  {        $first_name = $this->input->post('first_name');        $last_name = $this->input->post('last_name');         $phone = $this->input->post('phone');        $mobile = $this->input->post('mobile');        $city = $this->input->post('city');        $country = $this->input->post('country');        $description = $this->input->post('description');        $date_edited = $this->input->post('today');             $sus = array(           'first_name' => $first_name,           'last_name' => $last_name,           'phone' => $phone,           'mobile' => $mobile,           'city' => $city,          'country' => $country,           'description' => $description,           'date_edited' => $date_edited          );        $this->user_model->up_ct_acct($id,$sus);       }

some thing more simple put post data in model , id $this->db->where('user_id',$this->uri->segment(3));

<?php  class users extends ci_controller {      public function update_profile($id, $datum) {          $id = $this->uri->segment(3);             $datum['user_profile'] = $this->user_model->get_da_profile($id);         $content['main_content'] = $this->load->view('users/update_profile',$datum);          $this->load->view('main',$content);      }       public function up_sup_acct() {          $this->load->model('user_model');         $this->user_model->up_ct_acct();           }   }  ?>

model

<?php  class user_model extends ci_model {      public function up_ct_acct() {         $data = array(             'first_name' => $this->input->post('first_name'),             'last_name' => $this->input->post('last_name'),             'phone' => $this->input->post('phone'),             'mobile' => $this->input->post('mobile'),             'city' => $this->input->post('city'),             'country' => $this->input->post('country'),             'description' => $this->input->post('description'),             'date_edited' => $this->input->post('today')          );          $this->db->where('user_id',$this->uri->segment(3));           $this->db->update('users',$data);      } }

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