Rails 嵌套属性尝试更新记录 ID

Question

我有嵌套属性的问题，我有下一个实体：

class Experience < ActiveRecord::Base
  has_many :roles, inverse_of: :experience
end

class Role < ActiveRecord::Base
  belongs_to :experience, inverse_of: :roles
end

我有下一组参数：

 params = {"end_date"=>"02/01/2012",
 "city"=>"Buenos Aires",
 "state"=>"",
 "country"=>"",
 "title"=>nil,
 "company"=>"Restorando",
 "current"=>nil,
 "description"=>nil,
 "roles_attributes"=>
  [{"id"=>558, "title"=>"System Owner", "start_date"=>"03/01/2000", "end_date"=>"02/01/2001", "description"=>"<p>I did a bunch of stuff</p>", "current"=>false},
   {"id"=>561, "title"=>"Test", "description"=>nil, "current"=>nil},
   {"id"=>557, "title"=>"Full Stack Developerr", "start_date"=>"01/01/2011", "end_date"=>"02/01/2012", "description"=>"<p>Full Stack Developer description</p>", "current"=>false}],
 "resumes_experiences_attributes"=>[{"id"=>384, "resume_id"=>809}, {"id"=>385, "resume_id"=>3199}]}

我想更新一个 Rails 模型。所以我执行：

@experience = Experience.find(some_id)
@experience.update_attributes(params)

这给我返回一个错误

ActiveRecord::RecordNotUnique：PG::UniqueViolation：错误：重复的键值违反了唯一约束“roles_pkey”

如果我看到 Rails 试图更新什么，我会看到下一条sql语句：

UPDATE“角色”SET“start_date”= $1，“end_date”= $2，“current”= $3，“id”= $4，“description”= $5，“title”= $6，“created_at”= $7，“updated_at” = $8 WHERE "角色"."id" = $9 [["start_date", nil], ["end_date", nil], ["current", nil], ["id", 561], ["description", nil]，[“标题”，“测试”]，[“created_at”，“2017-06-23 10:54:10.194605”]，[“updated_at”，“2017-06-23 10:54:10.194605”] ，[“id”，558]]

这对我来说很奇怪，因为它试图更新记录id，如果您看到语句，您将看到："id" = $4和 where 子句WHERE "roles"."id" = $9，这是正确的，但它采用两个不同的id值。

相反，如果我执行：

@experience = Experience.include(:roles).find(some_id)
@experience.update_attributes(params)

效果很好

如果我进入 Rails 控制台并手动触发它，初始情况也会起作用。我不知道为什么会发生这种情况，当然应用程序更加复杂，我只是为您提供解决问题的基本数据，但任何见解都会有所帮助。