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例如，我有三个模型类：

class Promotion < ApplicationRecord
  has_many :promotion_sets, dependent: :destroy
  accepts_nested_attributes_for :promotion_sets
end

class PromotionSet < ApplicationRecord
  belongs_to :promotion
  has_many :promotion_set_details, dependent: :destroy
  accepts_nested_attributes_for :promotion_set_details
end

class PromotionSetDetail < ApplicationRecord
  belongs_to :promotion_set
end

我想插入。例如这里是我的代码：

  Promotion.create(id: 999)
  promotion.promotion_sets
   .create(prepare_promotion_set_attrs(attributes['promotion_sets']))

然后这些是准备子属性的方法：

def prepare_promotion_set_attrs(set_attrs)
  promotion_sets_attributes = []
  set_attrs&.each do |attr|
    promotion_sets_attributes.push(
      id:  123456,
      promotion_set_details_attributes: prepare_promotion_set_details_attrs(attr['set_details'])
    )
  end

  promotion_sets_attributes
end

def prepare_promotion_set_details_attrs(set_detail_attrs)
  promotion_set_details_attributes = []
  set_detail_attrs&.each do |attr|
    promotion_set_details_attributes.push(
      # sample fields here
    )
  end

此插入已成功执行。但是当我将插入代码从插入外部移动到accepts_nested_attributes_for仅用于类促销时：

Promotion.create(
        id: 999,
        promotion_sets_attributes: prepare_promotion_set_attrs(some_data),
      )
# not use this 
# promotion.promotion_sets
#   .create(prepare_promotion_set_attrs(attributes['promotion_sets']))

我遇到异常：

ActiveRecord::RecordNotFound: 找不到 ID=123456 的 PromotionSet 用于 ID=999 的 Promotion

我无法解释为什么。而且我不知道为什么这只发生在Promotion类但PromotionSet类可以插入使用accepts_nested_attributes_for而没有任何错误。

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