Merge branch 'dev_aliyun' into educoder

db/migrate/20190726101533_modify_test_user_for_school.rb

@@ -1,6 +1,6 @@
 class ModifyTestUserForSchool < ActiveRecord::Migration
   def up
-    school_ids = School.pluck(:id)
+    school_ids = School.where("id < 1500").pluck(:id)
     users = User.where(is_test: true).includes(:user_extensions)
     users.find_each do |u|
       school_id = school_ids.sample