模型关联依赖于另一个模型的属性值

Question

关联定义：

class User < ApplicationRecord
  # oneself information
  has_one :oneself, -> { oneself }, class_name: 'Information', dependent: :nullify
  accepts_nested_attributes_for :oneself, allow_destroy: true

  # friend information
  has_many :friends, -> { friend }, class_name: 'Information', dependent: :nullify
  accepts_nested_attributes_for :friends, allow_destroy: true

  ...
end

class Information < ApplicationRecord
  belongs_to :user, optional: true

  enum category: { oneself: 1, friend: 2 }
  ...
end

Controller.action定义：

class UsersController < ApplicationController
  ...

  def new
    @user = User.new
    @user.build_oneself # because need show on page loaded
  end

  ...

  # strong_params
  def user_params
    params.require(:user).permit(:name,
                                 oneself_attributes: [:id, :name],
                                 friends_attributes: [:id, :name])
  end
end

当我以茧形嵌套形式创建时：

= simple_form_for @user do |f|
  ...
  = f.simple_fields_for :oneself do |of|
    = render partial: 'oneself_fields', locals: { f: of }

  = f.simple_fields_for :friends do |ff|
    = render partial: 'oneself_fields', locals: { f: ff }

  = link_to_add_association 'Add friend', f, :friends
  = f.submit

HTML和动态创建是可以的，但无法保存！数据结构如下：

params: {
  "name" => xxx,
  "oneself_attributes" => {"id" => xxxx, "name" => xxxx},
  "friends_attributes" => {"123" => {"id" => xxx, "name" => xxx}},{"456" => {"id" => xxx, "name" => xxx}}
}

这是问题所在：build_oneself 不是临时主键！ 通过javascript创建oneself嵌套表单时，单击“隐藏link_to_add_association”，则错误更改为Can't save User.oneself not user_id

我尝试过：

class Information < ApplicationRecord
  enum category: { oneself: 1, friend: 2 }
end

class Oneself < Information
  attribute :category, :integer, 1
end

class Friend < Information
  attribute :category, :integer, 2
end