Factory Bot

Question 1

How to install factory_bot?

Answer 1

# install gem 
  gem 'factory_bot_rails'

Question 2

How to generate a factory?

Answer 2

rails g factory_bot:model task

Question 3

How to define base factory structure?

Answer 3

# spec/factories/model_names.rb
FactoryBot.define do
  factory :model_name do

end
end

Question 4

How to add fields to the factory?

Answer 4

FactoryBot.define do
  factory :task do
    name { 'name' }
    age { 1 } 
  end
end

Question 5

How to avoid using FactoryBot prefix every time? (just create instead of FactoryBot.create)

Answer 5

RSpec.configure do |config|
config.include FactoryBot::Syntax::Methods
end

Question 6

How to refer to a previously assigned value in the factory?

Answer 6

factory :animal do
age { 1 }
name { “name #{age}” }
end

Question 7

What are 4 ways to create factory_bot object?

Answer 7

• FactoryBot.create(:project) # saves to a database
• FactoryBot.build(:project) # doesn’t save to a database
• FactoryBot.build_stubbed(:project) # doesn’t save to a database and create fake id
• FactoryBot.attributes_for(:project) # returns hash with all factory bot methods

Question 8

How to create a list of factories?

Answer 8

• FactoryBot.create_list(:animal, 3)

Question 9

How to create only 2 factories?

Answer 9

• FactoryBot.create_pair(:animal)

Question 10

How to create uniq value for the factory field?

Answer 10

sequence(:name) { |n| "Name #{n}" } 
# will return Name 1, Name 2 etc

Question 11

How to overwrite parameters for the factory and define the new one inside the factory? ( 2 ways )

Answer 11

# use inheritance
# first way
  factory :animal do
    age { 1 }
    name { 'name' }
  end

factory :old_animal, parent: :animal do
age { 100 }
end

# another way
  factory :animal do
    age { 1 }
    name { 'name' }

factory :old_animal do
  age { 100 }
end   end

Question 12

How to group attributes in a single chunk of information?

Answer 12

trait :old do
age { 100 }
end

create(:animal, :old)

Question 13

How to add polymorphic association?

Answer 13

FactoryBot.define do
  factory :versions_employee
    event { 'update' }
    association :item, factory: :employee
  end
end