优化N+1的问题

app/models/challenge.rb

@@ -80,7 +80,7 @@ class Challenge < ApplicationRecord
   # end
 
   def open_game shixun, user_id
-    game = self.games.where(user_id: user_id).first
+    game = self.games.map{|g| g.user_id == user_id}.first
     if game.present?
       shixun.task_pass || game.status != 3 ? "/tasks/#{game.identifier}" : ""
     else