ruby-on-rails - 印象派宝石归零，为什么？

Question

我的代码有什么问题？这是索引

<%= post.impressionist_count(:filter=>:ip_address) %>

这是控制器

impressionist actions: [:show], unique: [:session_hash]
  is_impressionable :counter_cache => true, :column_name => :my_column_name, :unique => true

这是post.rb

is_impressionable :counter_cache => true, :column_name => :my_column_name, :unique => true