Rails Tutorial Chapter 14 Creating Relationship Test Data with Factory Bot

Introduction

As I was working on the Rails tutorial with rspec support, I was addicted to creating Relationship test data for the user in Listing 14.28 in 14.2.3 with FactoryBot, so I'll post it as a reminder.

environment

• ruby 2.7.2
• rails 6.0.3
• factory_bot_rails 6.1.0
• rspec-rails 4.0.1

Thing you want to do

(1) Define the fixture that creates the relationship test data in FactoryBot as shown below. (2) Create user test data in the FactoryBot definition at the same time.

ruby:test/fixtures/relationships.yml(Listing 14.28)

one:
  follower: michael
  followed: lana

two:
  follower: michael
  followed: malory

three:
  follower: lana
  followed: michael

four:
  follower: archer
  followed: michael

Solutions

Give it a try and list the solutions you have adopted.

Part 1 Define a Factory that creates Relationship test data (solve only ①)

This is the most straightforward method. Create a factory for the Relationship class with follower_id and followed_id. However, I couldn't set the association well by this method, so I created the user test data separately.

spec/factories/relationships.rb

 factory :relationship, class: Relationship do
    follower_id { follower.id }
    followed_id { followed.id }
  end

spec/models/relationship_spec.rb

RSpec.describe Relationship, type: :model do
  let(:follower) { create(:user) }
  let(:followed) { create(:user) }
  let(:relationship) { create(:relationship, follower: follower, followed: followed) }

  it { expect(relationship).to be_valid }
end

Part 2 Define FactoryBot that creates test data for users with Relationship (solve both ① and ②?)

The second method is to create test data for users with relationships. The user's test data does not need to have a relationship in every test, so we allow it to be set as needed in the trait. This way, you don't have to create user and relationship test data respectively. However, this method is just a method of creating test data of user, and it seems that it is not suitable for testing relationship because it is necessary to pass user to call relationship.

spec/factories/users.rb

factory :user do
  .
  .
  .
  trait :has_followed do
    after(:create) do |user|
      followed = create(:user)
      user.follow(followed) 
    end
  end
end

spec/models/relationship_spec.rb

RSpec.describe Relationship, type: :model do
  let(:user) { create(:user, :has_followed) }

  it { expect(user.actve_relationships).to be_valid }
end

At the end

In the end, I couldn't find a solution to completely achieve ①②, so I decided to write the relationship test in part 1 and the relationship user test in part 2.

References

-FactoryBot (FactoryGirl) Cheat Sheet -Create has_many through association with factory_bot -Only 5 things to remember when using FactoryBot