Rspec 2.14，FactoryGirl 4.2，Rails 3.2.11 - has_many通過

Question

我是FactoryGirl的新手（一般測試），我試圖建立一個has_many關係的工廠。到目前爲止，我發現的所有例子都使用了舊版本的工廠女孩​​，官方文檔並沒有那麼有用。

當我運行我的測試，它說：

Failures: 

    1) Brand has a valid factory 
    Failure/Error: FactoryGirl.create(:brand).should be_valid 
    ActiveRecord::RecordInvalid: 
     Validation failed: Styles can't be blank 
    # ./spec/models/brand_spec.rb:5:in `block (2 levels) in <top (required)>' 

brand.rb

class Brand < ActiveRecord::Base 
    attr_accessible    :title, 
           :style_ids 

    has_many      :brand_styles, dependent: :destroy 
    has_many      :styles,  through: :brand_styles 

    validates_presence_of   :title 
    validates_presence_of   :styles 
end 

style.rb

class Style < ActiveRecord::Base 
    attr_accessible    :title 

    has_many      :brand_styles, dependent: :destroy 
    has_many      :brands,  through: :brand_styles 

    validates_presence_of   :title 
end 

brand_style.rb個

class BrandStyle < ActiveRecord::Base 
    attr_accessible :brand_id, 
        :style_id 

    belongs_to  :brand 
    belongs_to  :style 
end 

工廠

FactoryGirl.define do 
    factory :brand do 
    title "Some Brand" 

    after(:create) do |brand| 
     brand.style create(:brand_style, brand:brand, style: FactoryGirl.build(:style)) 
     brand.reload 
    end 
    end 

    factory :style do 
    title "Some Style" 
    end 

    factory :brand_style do 
    brand 
    style 
    end 
end 

規範

require 'spec_helper' 

describe Brand do 
    it "has a valid factory" do 
    FactoryGirl.create(:brand).should be_valid 
    end 
end 

---編輯---

我修改我的事實每達明羅切斯建議ORY，我現在收到此錯誤：

Failures: 

    1) Brand has a valid factory 
    Failure/Error: FactoryGirl.create(:brand).should be_valid 
    NoMethodError: 
     undefined method `primary_key' for #<FactoryGirl::Declaration::Implicit:0x007fc581b2d178> 
    # ./spec/factories/brand.rb:4:in `block (3 levels) in <top (required)>' 
    # ./spec/models/brand_spec.rb:5:in `block (2 levels) in <top (required)>' 

改性工廠

FactoryGirl.define do 
    factory :brand do |brand| 
    brand.title "Some Brand" 
    brand.styles { build_list(:brand_style, 1, brand: brand, style: build(:style)) } 
    end 

    factory :style do 
    title "Some Style" 
    end 

    factory :brand_style do 
    brand 
    style 
    end 
end 

Answer 1

這個替換您after(:create)塊：

styles { build_list(:brand_style, 1, brand: brand, style: build(:style)) } 

我factory_girl知識是一點點粗糙，所以讓我知道你是否有進一步的麻煩，當我有機會時我會回覆。

幾個音符。您不能使用after(:create)，因爲您的brand型號需要styles。您不能使用brand.style，因爲關係是has_many。那應該是brand.styles。有了這個，你不能使用brand.styles = create()，因爲賦值需要一個數組。您可以使用brand.styles = [create()]，但我更喜歡create_list。

我已將create(:brand_style)替換爲build。測試不同的變體，因爲有時根據您的配置保存父對象時，關聯不會保存。詳情請參閱here。