Rails屬性別名

Question

我只是想知道是否有可能在Rails中「重命名」關聯。讓我們假設：

# An ActiveRecord Class named SomeModelASubModel (some_model_a_sub_model.rb) 
class SomeModelASubModel < ActiveRecord::Base 
    has_many :some_model_a_sub_model_items 
end 

# An ActiveRecord Class named SomeModelASubModelItem (some_model_a_sub_model_item.rb) 
class SomeModelASubModelItem < ActiveRecord::Base 
    belongs_to :some_model_a_sub_model 
end 

在這一點上，呼籲some_model.items，其中some_model是SomeModelASubModel類的實例會觸發一個未定義的方法錯誤。

儘管如此，最佳做法是什麼？ ：

# With a method_alias or something, would it be possible to : 
some_model = SomeModelASubModel.first # for instance 
items = some_model.items 

# For the reason stated, this doesn't work, one has to call : 
items = some_model.some_model_a_sub_model_items 

這樣的簡寫可能嗎？

預先感謝您！

Answer 1

您可以通過使用:items代替:some_model_a_sub_model_items的關係的名稱，並明確指定你指的是使用:class_name參數類的名稱實現這一點：

# An ActiveRecord Class named SomeModelASubModel (some_model_a_sub_model.rb) 
class SomeModelASubModel < ActiveRecord::Base 
    has_many :items, :class_name => "SomeModelASubModelItems" 
end 

見ActiveRecord docs爲更多信息。