Question

我只是想知道是否可以在Rails中“重命名”一个关联。我们假设：

# 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

此时，调用some_model.items，其中some_model是SomeModelASubModel类的实例将触发未定义的方法错误。

实现这一目标的最佳做法是什么，例如：：

# 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

这样的速记有可能吗？

提前谢谢！

Answer 1

您可以使用:items代替:some_model_a_sub_model_items作为关系名称来实现此目的，并使用:class_name参数显式指定您所引用的类的名称：

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

有关详细信息，请参阅ActiveRecord docs。

Rails属性别名

1 个答案: