How to update a table in laravel with a specific column value

Please, some help I'm trying a different ways to update an especific row. Im trying with models, I posted my first attempt. That is not good... The other option is to update each column, but, will be usefull has other ideas or options...

Route::put('/usuario/{fk_id_tid}/{ident}', function (Request $request, $fk_id_tid, $ident) {

$validator = Validator::make($request->all(), [
    'ident' => 'required|digits_between:5,12',
    'fname' => 'required|max:20',
    'mname' => 'required|max:20',
    'lname' => 'required|max:20',
    'lname2' => 'required|max:20',
    'email' => 'email',
    'telefono' => 'min:7',
    'celular' => 'min:10',
]);

if ($validator->fails()){
    return redirect('/usuarios')
        ->withErrors($validator)
        ->withInput();

}        

$user =  DB::table('usuario')->where('fk_id_tid', $fk_id_tid)->where('ident', $ident)->first();  
$user->fk_id_tid = $request->id_tid;
$user->ident = $request->ident; 
$user->fname = $request->fname;
$user->mname = $request->mname;
$user->lname = $request->lname;
$user->lname2 = $request->lname2;
$user->email = $request->email;
$user->telefono = $request->telefono;
$user->celular = $request->celular;

$user->save();

return redirect('/usuarios');

});

the information of the columns comes with a post method.

Thanks for any help...

via Chebli Mohamed