嵌套:json包含在Rails中 [英] Nesting :json include in Rails
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问题描述
我有三种型号:
class A < ActiveRecord::Base
has_many :bs
end
class B < ActiveRecord::Base
has_one :c
belongs_to :a
end
class C < ActiveRecord::Base
belongs_to :b
end
我想获取包含A的所有B和C的json数据.我尝试了许多类似的事情:
I want to get json data containing all B's and C's for an A. I tried a number of things similar to:
render json: @as, :include => [:bs => [:include=>[:c]]
但没有任何效果.这样做的好方法是什么.
but nothing works. What would be a good way to do this.
推荐答案
请参阅 render :json
的选项.去引用:
Refer to ActiveModel::Serializers::JSON#as_json
to see the options you can pass to render :json
. To quote:
要包含关联,请使用
:include
...
第二级和更高级别的关联也可以工作:
Second level and higher order associations work as well:
user.as_json(:include => { :posts => {
:include => { :comments => {
:only => :body } },
:only => :title } })
# => { "id": 1, "name": "Konata Izumi", "age": 16,
# "created_at": "2006/08/01", "awesome": true,
# "posts": [ { "comments": [ { "body": "1st post!" }, { "body": "Second!" } ],
# "title": "Welcome to the weblog" },
# { "comments": [ {"body": "Don't think too hard" } ],
# "title": "So I was thinking" } ]
# }
不必像render :json
那样自动调用to_json
或as_json
.
It's not necessary to call to_json
or as_json
directly, as render :json
does it automatically.
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