为什么我的工厂和测试没有像我预期的那样工作？

Question

我正在使用 RSpec 和 Factory Girl。

以下是我的高层联想：

User 
  has_one :family_tree, dependent: :destroy
  has_many :memberships, through: :family_tree, dependent: :destroy

Family Tree
  belongs_to :user
  has_many :memberships, dependent: :destroy
  has_many :members, through: :memberships, dependent: :destroy

Membership
  belongs_to :family_tree
  belongs_to :user
  belongs_to :member

Member
  has_many :memberships, dependent: :destroy

这是我 User class 上的方法 my_relatives:

  def my_relatives
    self.family_tree.memberships.pluck(:relation)
  end

这些是我的工厂：

用户

  factory :user do
    association :family_tree
    first_name { Faker::Name.first_name }
    last_name { Faker::Name.last_name }
    email { Faker::Internet.email }
    password "password123"
    password_confirmation "password123"
    bio { Faker::Lorem.paragraph }
    invitation_relation { Faker::Lorem.word }
    # required if the Devise Confirmable module is used
    confirmed_at Time.now
    gender 1
  end

会员

  factory :member do
    first_name { Faker::Name.first_name }
    last_name { Faker::Name.last_name }
    email { Faker::Internet.email }
    bio { Faker::Lorem.paragraph }
    gender 1
  end

会员资格

  factory :membership do
    family_tree
    user
    relation { Faker::Lorem.word }
    member
  end

家谱

  factory :family_tree do
    name { Faker::Name.name }
  end

这是我的测试：

  it "should return all the relatives of a user" do
    u1 = create(:user)
    ft = create(:family_tree, user: u1)
    relation = "nephew"
    u2 = create(:user)
    membership = create(:membership, user: u2, relation: relation, family_tree: ft)
    expect(u1.my_relatives).to eq(u2.memberships.where(relation: relation).pluck(:relation))
  end

当我运行 RSpec 时，这是我得到的错误：

  1) User should return all the relatives of a user
     Failure/Error: expect(u1.my_relatives).to eq(u2.memberships.where(relation: relation).pluck(:relation))

       expected: []
            got: ["nephew"]

       (compared using ==)

为什么我得到一个空数组作为我对 u1.my_relatives 的主要期望？

当我在运行时用 pry 浏览变量时，我得到这个：

1] pry(#<RSpec::ExampleGroups::User>)> u1
=> #<User id: nil, email: "felicita@adams.info", encrypted_password: "a$EJWX5sLmBtDBgyA8tf35y.1FfhQcLRY3EAU/JxL8/tN...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30", first_name: "Brooks", confirmation_token: nil, confirmed_at: "2015-10-26 23:15:27", confirmation_sent_at: nil, unconfirmed_email: nil, invitation_relation: "similique", avatar: nil, invitation_token: nil, invitation_created_at: nil, invitation_sent_at: nil, invitation_accepted_at: nil, invitation_limit: nil, invited_by_id: nil, invited_by_type: nil, invitations_count: 0, bio: "Reiciendis ea omnis. Saepe ea amet nostrum deserun...", last_name: "Yost", gender: 1>
[2] pry(#<RSpec::ExampleGroups::User>)> ft
=> #<FamilyTree id: nil, name: "Ms. Milan Goldner", user_id: 1197, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30">
[3] pry(#<RSpec::ExampleGroups::User>)> relation
=> "nephew"
[4] pry(#<RSpec::ExampleGroups::User>)> u2
=> #<User id: nil, email: "jeie@lockman.org", encrypted_password: "a$z.UVWka/mRKCK6hp33LOuuBHaL8S7h1LnmWbonMfBkd...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30", first_name: "Adrien", confirmation_token: nil, confirmed_at: "2015-10-26 23:15:27", confirmation_sent_at: nil, unconfirmed_email: nil, invitation_relation: "repellat", avatar: nil, invitation_token: nil, invitation_created_at: nil, invitation_sent_at: nil, invitation_accepted_at: nil, invitation_limit: nil, invited_by_id: nil, invited_by_type: nil, invitations_count: 0, bio: "Rerum sunt ratione labore deserunt. Et quibusdam s...", last_name: "Renner", gender: 1>
[5] pry(#<RSpec::ExampleGroups::User>)> membership
=> #<Membership id: 126, family_tree_id: 1649, user_id: 1198, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30", relation: "nephew", member_id: 75, connection_sent_at: nil, connection_responded_at: nil, connect_send_limit: nil, connect_times_sent: nil, connected: nil, connect_type: nil, request_status: nil, connection_removed_at: nil>
[6] pry(#<RSpec::ExampleGroups::User>)> u1.my_relatives
=> []
[7] pry(#<RSpec::ExampleGroups::User>)> u1.family_tree
=> #<FamilyTree id: nil, name: "Ms. Milan Goldner", user_id: 1197, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30">
[8] pry(#<RSpec::ExampleGroups::User>)> u1.family_tree.memberships
=> []
[9] pry(#<RSpec::ExampleGroups::User>)> u1.memberships
=> []
[11] pry(#<RSpec::ExampleGroups::User>)> membership
=> #<Membership id: 126, family_tree_id: 1649, user_id: 1198, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30", relation: "nephew", member_id: 75, connection_sent_at: nil, connection_responded_at: nil, connect_send_limit: nil, connect_times_sent: nil, connected: nil, connect_type: nil, request_status: nil, connection_removed_at: nil>
[12] pry(#<RSpec::ExampleGroups::User>)> membership.family_tree
=> #<FamilyTree id: nil, name: "Ms. Milan Goldner", user_id: 1197, created_at: "2015-10-26 23:15:30", updated_at: "2015-10-26 23:15:30">

因此，即使局部变量 membership 被正确分配，即具有正确的 user 和 family_tree 记录，当我尝试从用户的角度访问它时 - 即 u1 它 returns 一个空数组。

我认为这与我的 u1 对象上的 family_tree 记录是 nil 这一事实有关。不过不确定如何处理。

Answer 1

我认为你不需要使用 through: :family_tree, dependent: :destroy

在

用户 has_one :family_tree, dependent: :destroy has_many :memberships, through: :family_tree, dependent: :destroy

因为用户和会员之间存在直接关系，因为您在会员中有 belongs_to :user

会员资格 belongs_to :family_tree belongs_to :user belongs_to :member

当您执行 u2.memberships.where(relation: relation).pluck(:relation) 时，您的测试正在生成 [] 数组，因为没有为第二个用户创建家谱。

为什么我的工厂和测试没有像我预期的那样工作？

Why are my factories and test not working like I expect?

rspec

ruby-on-rails

rspec-rails

ruby-on-rails-4

factory-bot