fix circular dependency

src/metabase/models/card.clj

@@ -35,7 +35,7 @@
   (post-select [_ {:keys [creator_id] :as card}]
     (map->CardInstance (assoc card
                               :creator         (delay (User creator_id))
-                              :dashboard_count (delay (-> (select metabase.models.dashboard-card/DashboardCard
+                              :dashboard_count (delay (-> (select @(ns-resolve 'metabase.models.dashboard-card 'DashboardCard)
                                                                   (aggregate (count :*) :dashboards)
                                                                   (where {:card_id (:id card)}))
                                                           first

src/metabase/models/dashboard_card.clj

@@ -19,4 +19,4 @@
         (set/rename-keys {:sizex :sizeX ; mildly retarded: H2 columns are all uppercase, we're converting them
                           :sizey :sizeY}) ; to all downcase, and the Angular app expected mixed-case names here
         (assoc :card      (delay (Card card_id))
-               :dashboard (delay (sel :one 'metabase.models.dashboard/Dashboard :id dashboard_id))))))
+               :dashboard (delay (sel :one 'Dashboard :id dashboard_id))))))