Rails ActiveRecord 模型未在 RSpec 模型规范中更新

Question

这让我发疯。我在不丢失上下文的情况下将其精简到最低限度（我认为！）

我想做的就是检查当我更新一个值并将其保存到数据库时，该值是否已保存。我想这样做是因为我需要编写一些其他代码来在 before_save 回调中有条件地阻止这种情况，并且在我确定它正在工作之前我无法测试它！

下面是工厂和规格，我敢肯定这确实很愚蠢，但我就是想不通...

FactoryGirl.define do

  factory :programme do
    name 'Trainee Programme'
  end

  factory :membership do
    programme
  end

  factory :specialty do
    sequence(:name) { |n| "Specialty #{n}" }
  end

  factory :user do
    sequence(:email) { |n| "factorygirl-user-#{n}@remailer.org" }
    password 'password'
    password_confirmation 'password'
    factory :trainee, class: User do
      sequence(:email) { |n| "factorygirl-trainee-#{n}@remailer.org" }
      name 'Factory Girl Trainee'
      after(:create) do |user|
        FactoryGirl.create(:membership, user: user, start_date: 1.day.ago)
      end
    end
  end

end

describe Membership do

  let(:trainee) { FactoryGirl.create(:trainee) }

  it 'sets specialty' do
    puts trainee.current_membership.inspect
    trainee.current_membership.specialty = specialty
    puts trainee.current_membership.inspect
    trainee.current_membership.save!
    puts trainee.current_membership.inspect
    expect(trainee.current_membership.specialty).to eq(specialty)      
  end

end

规范失败，因为期望看到一个 nil 值。当我运行代码时，我得到的调试输出是：

#<Membership id: 11, user_id: 11, programme_id: 11, start_date: "2015-03-10", end_date: nil, created_at: "2015-03-11 22:02:51", updated_at: "2015-03-11 22:02:51", options: {}, specialty_id: nil, membership_type_id: nil>
#<Membership id: 11, user_id: 11, programme_id: 11, start_date: "2015-03-10", end_date: nil, created_at: "2015-03-11 22:02:51", updated_at: "2015-03-11 22:02:51", options: {}, specialty_id: nil, membership_type_id: nil>
#<Membership id: 11, user_id: 11, programme_id: 11, start_date: "2015-03-10", end_date: nil, created_at: "2015-03-11 22:02:51", updated_at: "2015-03-11 22:02:51", options: {}, specialty_id: nil, membership_type_id: nil>

所以好像专业的分配从来没有发生过？？

Answer 1

尝试重新加载 trainee，例如

expect(trainee.reload.current_membership.specialty).to eq(specialty)

Answer 2

我能想到的唯一原因是 speciality 是一条新的非持久记录。由于 membership belongs_to :speciality 和 membership 已经持久化，因此它不会在赋值时或保存时保存关联对象。简而言之，确保 speciality 在创建关联之前已保存。

Answer 3

感谢 BroiState 和 Mori 给我的一些指示，我能够确定它与持久性有关（特别是我的一个对象方法不尊重它！）

trainee.current_membership的代码如下：

def current_membership
  return unless memberships.current.any?
  memberships.current.first
end

在成员资格中使用这些相关范围...

scope :started, -> { self.where("#{table_name}.#{_start_field}::TIMESTAMP < '#{Time.now}'") }
scope :not_ended, -> { self.where("#{table_name}.#{_end_field} IS NULL OR #{table_name}.#{_end_field}::TIMESTAMP > '#{Time.now}'") }
scope :current, -> { self.started.not_ended }

所以每次调用 trainee.current_membership 都会给我一个 'current' 会员记录的新实例

通过明确使用同一对象，规范顺利通过，即：

it 'sets specialty' do
  membership = trainee.current_membership
  membership.specialty = specialty
  membership.save!
  expect(membership.specialty).to eq(specialty.reload)      
end

Rails ActiveRecord 模型未在 RSpec 模型规范中更新

Rails ActiveRecord Model not updating in RSpec model spec

ruby

activerecord

rspec

ruby-on-rails

ruby-on-rails-3