如何用rails中的json更新nested_attributes？

Question

我有

 class Test < ActiveRecord::Base
        has_many :samples
        accepts_nested_attributes_for :samples
 end

和

 class Sample < ActiveRecord::Base
    belongs_to :tests
 end

现在,当我创建新值如下

curl -H'Content-Type:application/json'-H'Eccept:application/json'-X POST http://localhost:3000/tests.json-d"{\"test \":{\"name \":\"xxxxxx \","samples_attributes\":[{\"用户名\ ":\" YYYYYYY\"\ "年龄\":\ "25 \"}]}}"

它为测试创建一个新值,它还在sample表中创建一个条目,但在更新时更新测试表,而在样本表中创建一个新条目.那我怎么能让它更新目前的条目？

请帮我.

Answer 1

您需要传递id散列中的更新记录(视图API):

class Member < ActiveRecord::Base   
  has_many :posts   
  accepts_nested_attributes_for :posts
end

如果哈希包含id与已关联记录匹配的密钥,则将修改匹配记录:

member.attributes = {
  name: 'Joe',
  posts_attributes: [
    { id: 1, title: '[UPDATED] An, as of yet, undisclosed awesome Ruby documentation browser!' },
    { id: 2, title: '[UPDATED] other post' }
  ]
}

对于没有id密钥的每个哈希,将实例化新记录.

params = { member: {
  name: 'joe', posts_attributes: [
    { title: 'Kari, the awesome Ruby documentation browser!' },
    { title: 'The egalitarian assumption of the modern citizen' }
  ]
}}