:+1 yeah.. that was just a quick hack i did.

imho, we should not fail here at all rather do something like this in index
```ruby

def index
  @settings = Setting.all ...
  begin
    render :index
  rescue ActiveRecord::SubclassNotFound
   broken_class = <extract it here>
   @settings = @settings.where('category != broken_class')
   retry
  end
end