🤔 Situation
You want to make a user with a book that title is 'Ruby'.
class User
has_many: books
end
class Book
belongs_to: user
end
👍 Solution
- trait: you can run the process
- trait with arguments: It is DEPRECATED, we should use
transientinstead. - transient: you can define and pass arguments with the block
FactoryBot.define do
factory :user, class: User do
trait :with_book
transient do
# 🦄1. default value when you use :with_book trait
# 🦄2. Dont't assign just 'Agile'. see also: https://thoughtbot.com/blog/deprecating-static-attributes-in-factory_bot-4-11
title { 'Agile' }
end
after(:build) do |user, evaluator|
user.book = FactoryBot.create(:book, title: evaluator.title)
end
end
end
factory :book, class Book do
sequence(:title) { |n| "book no.#{n}" } # 🦄 default value
end
end
let!(:user) { create(:user, :with_book, title: 'Ruby') }
Top comments (2)
Thank you for this small snippet, it was quite useful!
Very helpful! Small thing -- there should be a
doaftertrait :with_book