challenge index优化

app/models/challenge.rb

@@ -97,12 +97,12 @@ class Challenge < ApplicationRecord
 
   # 关卡用户通关数
   def user_passed_count
-    games.select{|game| game.status == 2}.size
+    games.where(status: 2).count
   end
 
   # 关卡用户正在挑战的人数
   def playing_count
-    games.select{|game| game.status == 0 || game.status == 1}.size
+    games.where(status: [0, 1]).count
   end
 
   def last_challenge