无法访问RSpec中的非持久化关联

我有两个模型叫做 Contract Appendix . 后者有范围 persisted 用于排除非持久化对象。我想为范围编写规范,但似乎我根本无法访问规范中的非持久关联。

模型:

class Contract < ApplicationRecord
  has_many :appendixes
end

class Appendix < ApplicationRecord
  belongs_to :contract
  scope :persisted, -> { where 'id IS NOT NULL' }
end 

context 'within persisted scope' do
  it 'returns only persisted appendixes' do
    contract = Contract.create(attributes_for(:contract))
    Appendix.create(attributes_for(:appendix, contract: contract))
    contract.appendixes.new
    byebug
  end
end

示例:

contract.appendixes 返回与相同的 contract.appendixes.persisted 尽管在byebug之前,新的非持久化附录已经初始化,这应该会有所不同(?):

(byebug) contract.appendixes
#<ActiveRecord::Associations::CollectionProxy []>
(byebug) contract.appendixes.persisted
#<ActiveRecord::AssociationRelation []>

2.5.1 :061 > c = Contract.last
2.5.1 :062 > c.appendixes
 => #<ActiveRecord::Associations::CollectionProxy []>
2.5.1 :063 > c.appendixes.new
 => #<Appendix id: nil, ...
2.5.1 :064 > c.appendixes
 => #<ActiveRecord::Associations::CollectionProxy [#<Appendix id: nil, ...
2.5.1 :065 > c.appendixes.persisted
  Appendix Load (1.6ms)  SELECT  "appendixes".* FROM "appendixes" WHERE "appendixes"."contract_id" = $1 AND (id IS NOT NULL) LIMIT $2  [["contract_id", "b3a1645b-d4b1-4f80-9c43-6ddf3f3b7aba"], ["LIMIT", 11]]
 => #<ActiveRecord::AssociationRelation []>

我用 FactoryBot 属性直接初始化对象到DB以防万一(我以前完全通过FactoryBot初始化对象,但后来我认为FactoryBot可能不会以通常的方式与DB交互,这在FactoryBot的 documentation

问题: 我如何从规范中的contract对象中读取非持久化的附录?

• 红宝石2.5.1p57
• 轨道5.1.6