Rails FactoryGirl Factory with optional model association

问题

In accordance with rails 4 model association left join validate id I had to update my factories. I am trying to create a condition where a coupon can be created, but has a job id only assigned when it is executed i.e. :

FactoryGirl.define do
  factory :coupon do
    code { rand(25**25) }
    percent_discount { rand(100**1) }
    start_at { Time.now }
    end_at { 30.day.from_now }

    trait :executed do |c|
      job
      c.executed_at { Time.now }
    end
  end
end

回答1:

You can use callbacks in factory. Here is an example of it :

FactoryGirl.define do
  factory :coupon do
    code { rand(25**25) }
    percent_discount { rand(100**1) }
    start_at { Time.now }
    end_at { 30.day.from_now }

    after(:create) do |c|
      #do job related stuff
    end
  end
end

Checkout its documentation for more information : https://github.com/thoughtbot/factory_girl/blob/master/GETTING_STARTED.md#callbacks

UPDATE

Based on your last comment, I believe trait will not be useful. Here is something I understand create coupon > do some process > execute coupon > assign job. So after creating coupon I think there is some delay / process logic of coupon. So when you execute coupon at this time you need to create object of job and associate with that coupon. I believe following would be suitable for that flow :

FactoryGirl.define do
  factory :coupon do
    code { rand(25**25) }
    percent_discount { rand(100**1) }
    start_at { Time.now }
    end_at { 30.day.from_now }

    #This trait is used in case, 
    #if you want job to be assigned to coupon
    #for example create(:coupon,:executed)
    trait :executed do |c|
      association :job, factory: [:job] 
      c.executed_at { Time.now }
    end

  end
end

#In Test Case
@coupon = create(:coupon)
#have some test for coupon before execution
#now executing coupon
@coupon.update_attributes(job_id: create(:job), executed_at: Time.now)

回答2:

It seems that you should remove something like validates :job, presence: true or validates :job_id, presence: true from your coupon model

来源：https://stackoverflow.com/questions/35808602/rails-factorygirl-factory-with-optional-model-association

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ruby-on-rails

factory-bot