爲什麼排除時驗證不起作用：指向變量？

Question

我在我的ActiveRecord的驗證如下：

validates :username, :exclusion => { :in => %w(admin admins administrator administrators), :message => "\"%{value}\" is reserved."} 

其作品，因爲它應該。但是，當我將其替換爲：

validates :username, :exclusion => { :in => @reserved_words, :message => "\"%{value}\" is reserved."} 
@reserved_words = ["admin","admins","administrator","administrators"] 

我得到以下錯誤：

An object with the method #include? or a proc or lambda is required, and must be supplied as the :in option of the configuration hash.

這究竟是爲什麼？

Answer 1

您是否真的在初始化@reserved_words變量後使用它？你的線路應該交換！