学校为空的问题

app/helpers/application_helper.rb

@@ -168,7 +168,7 @@ module ApplicationHelper
 
   # 选用实训的学校情况
   def school_user_detail shixun
-    user_ids = shixun.myshixuns.select{|myshixun| myshixun.user_id}.uniq # 走缓存取数据
+    user_ids = shixun.myshixuns.map(&:user_id).uniq # 走缓存取数据
     school_ids = UserExtension.where(user_id:user_ids).pluck(:school_id).uniq
     school_names = School.where(id: school_ids[0..1]).pluck(:name)
     school_size = school_ids.size