我在做這個define_method有什麼問題？

Question

行，所以我想對所有的類型，如一個named_scope以下

class Variety < ActiveRecord::Base 
    TYPES = ["holiday", "party", "other", yet_another] 

    Variety::TYPES.each do |role| 
    define_method 
     scope "#{role.to_sym}_applications", where(:type => role) 
    end 
    end 
end 

基本上我想要的命名範圍定義的元編程，這樣我可以做到這一點

Variety.holiday_applications 
Variety.party_applications 
Variety.other_applications 
Variety.yet_another_applications 

任何想法，我我在定義方法中做錯了

Answer 1

嘗試將您的to_sym移動到整個方法名稱。

scope "#{role}_applications".to_sym, where(:type => role) 

Answer 2

Variety::TYPES.each do |role| 
    scope "#{role}_applications".to_sym, where(:type => role) 
end