Right now, using {% random_zone_ad %} or {% random_category_ad %} adds three queries to the page: one for the AdBase instance, one to check whether a TextAd instance exists, and one to check whether a BannerAd instance exists.
By adding a .select_related() call to AdManager.get_random_ad(), we can reduce the number of queries down to one.
Right now, using
{% random_zone_ad %}or{% random_category_ad %}adds three queries to the page: one for the AdBase instance, one to check whether a TextAd instance exists, and one to check whether a BannerAd instance exists.By adding a .select_related() call to AdManager.get_random_ad(), we can reduce the number of queries down to one.