public function delete($id)
 {
     $category = PostCategory::findOrFail($id);
     $id = $category->id;
     $category->delete();
     return redirect('admin/blog/categories/' . $id . '/posts');
 }
 public function setCategory($id, Request $request)
 {
     $category = PostCategory::findOrFail($request->new_category_id);
     Post::findOrFail($id)->attachTo($category);
     return redirect('admin/blog/categories/' . $category->id . '/posts');
 }