Update image won't work

I'm trying to update some data with image. The other data is updated but the image still not updated. here's my code

route

Route::get('film/{idFilm}/edit', array('as' => 'film.edit', 'uses' => 'FilmController@edit'));

Route::post('film/{idFilm}/update', array('as' => 'film.update', 'uses' => 'FilmController@update'));

controller

public function edit($idFilm)
{
    $film = Film::findOrFail($idFilm);
    $genre = Genre::lists('namaGenre', 'idGenre');
    if (is_null($film))
    {
        return Redirect::to('film');
    }
    return View::make('pengelolaan.film.editfilm', compact('film','genre'));
}


/**
 * Update the specified resource in storage.
 *
 * @param  int  $id
 * @return Response
 */
public function update($idFilm)
{
    $rules = array(
    'judulFilm' => 'required',
    'durasi' => 'required|numeric',
    'keterangan' => 'required',
    'idGenre' => 'required'
    );

    $validation = Validator::make(Input::all(), $rules);
     if ($validation->fails()) 
     {   
        return Redirect::to('film/' . $idFilm . '/edit')
        ->withErrors($validation)
        ->withInput()
        ->with('message', 'There were validation errors.');
      } 
      else 
      {
            $films = Film::find($idFilm);
            $films->judulFilm=Input::get('judulFilm');
            $films->durasi=Input::get('durasi');
            $films->keterangan= Input::get('keterangan');
            $films->idGenre= Input::get('idGenre');
            if(Input::hasFile('foto'))
            {
                $file=Input::file('foto');
                $file->move('img',$file->getClientOriginalName());
                $filename=$file->getClientOriginalName();
                $films->foto = $filename;
                $films->save();
            }
            else
            {
                $films->save();
            }

            Session::flash('message', 'Data Berhasil Diubah');
            return Redirect::to('film');
      }
}

view

 
             <div class="form-group">
                <div class="col-lg-6">
                    
                    
                </div>
            </div>
            <div class="form-group">
                <div class="col-lg-6">
                    
                    
                </div>
            </div>
            <div class="form-group">
                <div class="col-lg-6">
                    
                    
                </div>
            </div>
            <div class="form-group">
                <div class="col-lg-6">
                    
                    
                </div>
            </div>
            <div class="form-group">
                <div class="col-lg-6">
                    
                    
                </div>
            </div>
            </br>
            <div class="form-group">
                <div class="col-lg-6">
                    <a class="btn btn-default " href="">Batal</a>
                    
            

There's no error so i don't know whats wrong with it. Can someone please tell me what's wrong? Thanks in advance

via Sekar Anindya