FactoryGirl：has_many：through，validates_presence_of：关联错误：不能为空？

Question

我在我的Article工厂收到以下测试失败，该工厂has_many通过：，validates_presence_of与我的类别模型关系。类别需要在文章创建之前存在，所以我设置了一个before（：create），create_list钩子来创建和关联一些类别与正在创建的文章，但是我收到了下面的失败。我也尝试使用协会（例如关联：类别，工厂::类别），但基于我读过的，我的模型具有的关系（have_many：through），要求我使用before（：create ）挂钩。我错过了什么？

Failures: 

    1) Factory Girl article factory is valid 
    **Failure/Error: expect(factory).to be_valid, lambda { factory.errors.full_messages.join("\n") } 
     Categories can't be blank** 
    # ./spec/support/factories_spec.rb:17:in `block (4 levels) in <top (required)>' 

模式

class User < ActiveRecord::Base 
    ... 
    has_many :articles 
    ... 
end 

class Article < ActiveRecord::Base 
    belongs_to :user 

    has_many :article_categories 
    has_many :categories, through: :article_categories 

    validates_presence_of :categories 
    ... 
end 

class Category < ActiveRecord::Base 
    has_many :article_categories 
    has_many :articles, through: :article_categories 
    ... 
end 

class ArticleCategory < ActiveRecord::Base 
    attr_accessor :article_id, :category_id 

    belongs_to :article 
    belongs_to :category 
end 

工厂

FactoryGirl.define do 
    factory :user do 
    name { Faker::Name.name } 
    email { Faker::Internet.email } 
    password 'GoodP@ssw0rd' 
    password_confirmation 'GoodP@ssw0rd' 
    user_name { Faker.bothify('??????????###') } 

    after(:create) do |user, evaluator| 
     create_list(:article, rand(1..3), user: user) 
    end 
    end 
end 

FactoryGirl.define do 
    factory :article do 
    title { Faker::Lorem.paragraph[0..(rand(11..63))] } 
    content { Faker::Lorem.paragraph[0..(rand(150..5000))] } 

    before(:create) do |article, evaluator| 
     create_list(:category, rand(1..3), article: article) 
    end 
    end 
end 

FactoryGirl.define do 
    factory :category do 
    name { Faker::Lorem.characters(10) } 
    end 
end 

FactoryGirl.define do 
    factory :article_category do 
    end 
end 

Answer 1

工作的呢？

FactoryGirl.define do 
    factory :article do 
    title { Faker::Lorem.paragraph[0..(rand(11..63))] } 
    content { Faker::Lorem.paragraph[0..(rand(150..5000))] } 
    categories { create_list(:category, rand(1..3)) } 
    end 
end