迁移点赞数

db/migrate/20190705013204_modify_praises_count_for_challenges.rb

@@ -1,6 +1,6 @@
 class ModifyPraisesCountForChallenges < ActiveRecord::Migration[5.2]
   def change
-    challenges = Challenge.where(nil).unscope
+    challenges = Challenge.where(nil).unscoped
     challenges.find_each do |c|
       praises_count = c.praise_tread.where(praise_or_tread: 1).count
       c.update_column(:praises_count, praises_count)