如何返回子对象？
我的想法是一个简单的问题。这是我的代码：
class Fruit < ActiveRecord::Base
end
class Apple < Fruit
end
class Kiwi < Fruit
end
假设我正确设置了所有 STI，并且表中有多种类型的 Apple 和 Kiwi 记录。从这里...
fruits = Fruit.find(:all)
...我如何从水果数组中返回仅包含苹果的数组？
I have -- what I think -- is a simple question. Here's my code:
class Fruit < ActiveRecord::Base
end
class Apple < Fruit
end
class Kiwi < Fruit
end
Assume that I have all the STI setup correctly, and there are multiple types of Apple and Kiwi records in the table. From here...
fruits = Fruit.find(:all)
...how do I return an array of just Apples from the fruits array?
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如果它们只是普通对象，您也会这样做：
STI 使用
type字段来跟踪子模型，因此您也可以这样做如果您只想从数据库中获取苹果，就做
The same way you would do it if they were just normal objects:
STI uses the
typefield to keep track of the submodel, so you could also doIf you want to get only the apples from the database, just do