alias_method在NameError

Question

的ActiveRecord :: Base的結果我有一個模型直接從ActiveResource::Base繼承，而我試圖運行alias_method大多數在記錄的表中的列，但結果是一個NameError：

NameError: undefined method address_line_1' for class LeadImport::Base'

然而，我可以訪問屬性：

LeadImport::Base.new.address_line_1 #=> nil (not error) 

我班有一個名爲address_line_1表列，所以我看不到的問題。

class LeadImport::Base < ActiveRecord::Base 
    alias_method :address_1, :address_line_1 
end 

規格：紅寶石1.8.7，2.3.8的Rails

Answer 1

據一個網站，我發現，你應該使用alias_attribute代替：

The problem is that ActiveRecord doesn't create the accessor methods on the fly until the database connection is live and it has parsed the table schema. That's a long time after the class has been loaded.

class LeadImport::Base < ActiveRecord::Base 
    alias_attribute :address_1, :address_line_1 
end