我使用的是序列工廠女孩獲得獨特的價值觀，但我得到驗證錯誤

Question

我有這樣

class Lga < ActiveRecord::Base 
    validates_uniqueness_of :code 
    validates_presence_of :name 
end 

我定義爲L氣體工廠與

Factory.sequence(:lga_id) { |n| n + 10000 } 

Factory.define :lga do |l| 
    id = Factory.next :lga_id 
    l.code "lga_#{id}" 
    l.name "LGA #{id}" 
end 

定義的模型

然而，當我在script/console運行

Factory.create(:lga) 
Factory.create(:lga) 

我得到

>> Factory.create(:lga) 
=> #<Lga id: 2, code: "lga_10001", name: "LGA 10001", created_at: "2010-03-18 23:55:29", updated_at: "2010-03-18 23:55:29"> 
>> Factory.create(:lga) 
ActiveRecord::RecordInvalid: Validation failed: Code has already been taken 

Answer 1

問題是code和name屬性並沒有所謂的懶屬性。我曾想過寫東西喜歡的：

Factory.define :lga do |l| 
    l.code { |n| "lga_#{n+10000}" } 
end 

，但我想重用在name屬性的ID了。您可以確保 比id每次Factory.create是通過將其在after_build鉤稱爲評估。

Factory.define :lga do |l| 
    l.after_build do |lga| 
    id = Factory.next :lga_id 
    lga.code = "lga_#{id}" 
    lga.name = "LGA #{id}" 
    end 
end 

這隻適用於FactoryGirl 1.2.3及以上版本。

Answer 2

以前的答案仍然是正確的，但在FactoryGirl的新版本，你會得到一個警告。

Factory.next has been depreciated. Use FactoryGirl.generate instead. 

新代碼應該是這樣的：

Factory.define :lga do |l| 
    l.after_build do |lga| 
    id = FactoryGirl.generate :lga_id 
    lga.code = "lga_#{id}" 
    lga.name = "LGA #{id}" 
    end 
end 

來源：http://notesofgreg.blogspot.co.uk/2012/07/foolproof-factorygirl-sequence.html