input 2 tabel

public function create_action()
    {
        $this->_rules();

        if ($this->form_validation->run() == FALSE) {
            $this->create();
        }
        else {
            $user=$this->ion_auth->user()->row();
            $data = array(
        'nama'     => $this->input->post('nama',TRUE),
        'npm'      => $this->input->post('npm',TRUE),
        'fakultas' => $this->input->post('fakultas',TRUE),
        'jurusan'  => $this->input->post('jurusan',TRUE),
        'semester' => $this->input->post('semester',TRUE),
        'kamar'    => $this->input->post('kamar',TRUE),
        //'operator' => $this->input->post('operator',TRUE),
                'operator' =>$user->first_name.' '.$user->last_name,
        'noHP'     => $this->input->post('noHP',TRUE),
        );

            $ambil_id_mhs   = $this->db->get_where('daftar_mhs',array('npm'=>$this->input->post('npm',TRUE)));
            $ambil_id_kamar = $this->db->get_where('kamar',array('kamar'=>$this->input->post('kamar',TRUE)));
            foreach ($ambil_id_mhs->result() as $main){
                foreach ($ambil_id_kamar->result() as $mhs){
                    $kamar_id=$mhs->id;
                    $mhs_id=$main->id;

                }
            }

            $data_kamar=array(
                'id_mhs'   => $mhs_id,
                'id_kamar' => $kamar_id
            );

            $this->admin_model->insert($data);
             $this->mhs_kamar_model->insert($data_kamar);
            $this->session->set_flashdata('message', 'Create Record Success');
            redirect(site_url('admin_mahad_2014/'));
        }
    }