英文:
(Ruby on Rails active_model_serializers) How to move nested hash up one level in a 2-level deep association with ActiveModel::Serializer?
问题
在Ruby on Rails中，我有以下的ActiveRecord关联关系：
class Driver
has_one :car
delegate :tires, to: :car
end
class Car
belongs_to :driver
has_many :tires
end
class Tire
belongs_to :car
end
我有以下的序列化器：
class DriverSerializer < ActiveModel::Serializer
attributes :id, :name
has_one :car
class CarSerializer < ActiveModel::Serializer
attributes :id
has_many :tires
class TireSerializer < ActiveModel::Serializer
attributes :id
end
end
end
生成的JSON如下所示：
{
"id": 1,
"name": "Bob",
"car": {
"id": 1,
"tires": [
{
"id": 1
},
{
"id": 2
}
// 其他数据
]
}
}
但我希望将tires移到上一级，直接嵌套在driver下面。我想要利用现有的序列化器，而不使用Ruby的map方法。我知道可以这样做：
class DriverSerializer < ActiveModel::Serializer
attribute :tires
def tires
object.tires.map{|t| TireSerializer.new(t)}
end
end
但是否有一种更简单的方法将哈希表移到上一级？
英文:
I have the following ActiveRecord associations in Ruby on Rails:
class Driver
has_one :car
delegate :tires, to: :car
end
class Car
belongs_to :driver
has_many :tires
end
class Tire
belongs_to :car
end
I have the following Serializer:
class DriverSerializer < ActiveModel::Serializer
attributes :id, :name
has_one :car
class CarSerializer < ActiveModel::Serializer
attributes :id
has_many :tires
class TireSerializer < ActiveModel::Serializer
attributes :id
end
end
end
The resulting JSON looks like this:
{
"id": 1,
"name": "Bob",
"car": {
"id": 1,
"tires": [
{
"id": 1
},
{
"id": 2
}
...
]
}
}
But I want the tires to move up one level so that they're nested directly under driver. I want to leverage the serializers as-is, without using Ruby's map method. I know I can do this:
class DriverSerializer < ActiveModel::Serializer
attribute :tires
def tires
object.tires.map{|t| TireSerializer.new(t)}
end
end
But is there a simpler way to just move the hash up one level?
答案1
得分: 3
我认为在您的 Driver 模型中，对于 tires 属性，最好使用 has_one :tires, through: :car 关联，而不是将其委托给 :car。然后，您可以在 DriverSerializer 中为此属性使用 has_many 选项，并使用 TireSerializer 作为其序列化器。
class Driver
has_one :car
has_many :tires, through: :car
end
以及在您的 Driver 序列化器中：
class DriverSerializer < ActiveModel::Serializer
has_many :tires, serializer: TireSerializer
end
英文:
I think it's better to use has_one :tires, through: :car association for the tires attribute in you Driver model instead of delegating it to :car. You can then use the has_many option in your DriverSerializer for this attribute and use TireSerializer for its serializer.
class Driver
has_one :car
has_many :tires, through: :car
end
and in your Driver serializer
class DriverSerializer < ActiveModel::Serializer
has_many :tires, serializer: TireSerializer
end
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