laravel 5 update in database -

i created row in 'movies' table called 'slug' want store slug of titles of movies.the problem have 250 movies , don't want manually enter slug each 1 of them trying make script automatically update slugs.but failed that:

this code in filmcontroller.php:

class filmcontroller extends controller {  public function film()    {     $title = db::table('movies')->select('title');     $slug = str_replace(" ","-",$title);     db::table('movies')->update(array('slug' => $slug));   } } 

and in routes:

route::get('update','filmcontroller@film'); 

this error pops when go localhost/update:

object of class illuminate\database\query\builder not converted string

can tell me how change code can put in slug field in movies title of movie '-' insted of space between words?

$title object containing titles, , not string,so str_replace not work on can try using loop update each record according title

something like

$titles = db::table('movies')->select('title','id')->get(); foreach ($titles $title){      $slug = str_replace(" ","-",$title->title);      db::table('movies')->where('id',$title->id)->update(array('slug' => $slug)); }