public function getByCategory($slug)
 {
     $category = ClassifiedCategory::where('slug', 'like', $slug)->firstOrFail();
     $classifieds = Classified::join('classified_categories', 'classified_categories.id', '=', 'classifieds.classified_category_id')->where('slug', 'like', $slug)->where('is_approved', 1)->paginate(20, array('classifieds.*'));
     return View::make('classifieds.listings', array('classifieds' => $classifieds, 'category' => $category));
 }