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mike927
mike927

Reputation: 774

FactoryGirl - overwrite deep related object attribute

I have some not too common issue with factory. I've got several models related with each other. I created quite fine factory that creates that whole "chain" invoking only below 

FactoryGirl.create(:application)

Above command creates like I've mentioned before several related models. I user Faker to populate attributes' names. Everything works fine but, I would like to overwrite one deep related model called 'service' with application model. I thought about trait but I can't invoke that trait within 

trait :my_trait do
  name 'Overwritten name'
end

FactoryGirl.create(:application, :my_trait)

Obviously above is wrong because trait regards to application instead of nested service model. One solution I found is update it after create factory but I would prefer to do it more globally.

Upvotes: 0

Views: 108

Answers (1)

KARASZI István
KARASZI István

Reputation: 31467

In these cases we usually create a separate "lower" instance and pass that to the "upper" instance.

Like:

service = FactoryGirl.build(:service, name: 'Something else')
application = FactoryGirl.create(:application, service: service)

Of course you could also achieve the same behavior if you use this pattern very much in your codebase with the following factory:

factory :application do
  transient do
    service_name nil
  end

  association :service

  after(:build) do |application, evaluator|
    if evaluator.service_name
      application.service.name = evaluator.service_name
    end
  end
end

Upvotes: 1

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