add :pk_field back onto the GET /api/meta/table/:id response

src/metabase/api/meta/table.clj

@@ -13,7 +13,7 @@
 
 (defendpoint GET "/:id" [id]
   (->404 (sel :one Table :id id)
-         (hydrate :db)))
+         (hydrate :db :pk_field)))
 
 (defendpoint PUT "/:id" [id :as {body :body}]
   (write-check Table id)

src/metabase/models/table.clj

@@ -14,6 +14,7 @@
                :db          (or db (delay (sel :one db/Database :id db_id))) ; Check to see if `:db` is already set. In some cases we add a korma transform fn to `Table`
                :fields      (delay (sel :many Field :table_id id))           ; and assoc :db if the DB has already been fetched, so we can re-use its DB connections.
                :description (u/jdbc-clob->str description)
+               :pk_field    (delay (:id (sel :one :fields [Field :id] :table_id id (where {:special_type "id"}))))
                :can_read    (delay @(:can_read @(:db <>)))
                :can_write   (delay @(:can_write @(:db <>)))))