为什么我的工厂和测试不像我期望的那样工作？

Question

我正在使用RSpec和Factory Girl。

这是我在一个高层次的关联：

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 

这是方法my_relatives我User类：

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

这些都是我的工厂：

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 

成员

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的，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 ==) 

为什么我会得到一个空数组作为我的主要u1.my_relatives期待？

当我通过变量会在运行时用撬，我得到这个：

1] pry(#<RSpec::ExampleGroups::User>)> u1 
=> #<User id: nil, email: "felicita@adams.info", encrypted_password: "$2a$04$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: "$2a$04$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与正确user和family_tree记录正确分配，即，当我尝试从用户的角度访问它 - 即u1它返回一个空数组。

我认为这与我的u1对象上的family_tree记录为nil这一事实有关。不知道如何处理，但。

Answer 1

我觉得你不需要使用through: :family_tree, dependent: :destroy

在

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

因为有用户和会员之间的直接关系，因为你的会员有belongs_to :user

会员 belongs_to :family_tree belongs_to :user belongs_to :member

当你在做u2.memberships.where(relation: relation).pluck(:relation)时，你的测试正在生成[]数组，因为没有为第二个用户创建家族树。