Question

在边缘API（http://edgeapi.rubyonrails.org/classes/ActiveRecord/Enum.html）中，我们可以使用

Conversation.where(status: [:active, :archived])
Conversation.where.not(status: :active)

但现在我们只能使用像

这样的东西

Conversation.where(status: Conversation.statues[:active])

然后，在Rails 4.1.8中，如何同时查询:active和:archived？

Answer 1

这是你想要的：

Conversation.where(status: Conversation.statues.values_at(:active, :archived))

.. The mappings通过带有复数属性名称的类方法公开，该方法返回HashWithIndifferentAccess中的映射。

演示：

[12] pry(main)> Pet.all
  Pet Load (0.5ms)  SELECT "pets".* FROM "pets"
=> [#<Pet id: 6, animals: 1, created_at: "2015-02-21 10:40:19", updated_at: "2015-02-21 10:40:19", name: "Tilly">,
 #<Pet id: 7, animals: 0, created_at: "2015-02-21 10:40:31", updated_at: "2015-02-21 10:40:54", name: "Xav">,
 #<Pet id: 5, animals: 1, created_at: "2015-02-19 18:27:28", updated_at: "2015-02-21 10:41:06", name: "Mua">]
[13] pry(main)> Pet.where(animals: Pet.animals.values_at(:dog))
  Pet Load (0.7ms)  SELECT "pets".* FROM "pets"  WHERE "pets"."animals" IN (0)
=> [#<Pet id: 7, animals: 0, created_at: "2015-02-21 10:40:31", updated_at: "2015-02-21 10:40:54", name: "Xav">]
[14] pry(main)> Pet.where(animals: Pet.animals.values_at(:cat))
  Pet Load (0.8ms)  SELECT "pets".* FROM "pets"  WHERE "pets"."animals" IN (1)
=> [#<Pet id: 6, animals: 1, created_at: "2015-02-21 10:40:19", updated_at: "2015-02-21 10:40:19", name: "Tilly">,
 #<Pet id: 5, animals: 1, created_at: "2015-02-19 18:27:28", updated_at: "2015-02-21 10:41:06", name: "Mua">]

但下面更清洁： -

Conversation.where(status: [:active, :archived])

Rails：具有多个值的枚举查询

1 个答案: