FactoryBot 使用总结

# 返回对象 但是不保存
user = build(:user)

# 返回对象并且保存
user = create(:user)

# 返回可用于构建用户实例的属性 HASH
attrs = attributes_for(:user)

# 返回一个对象，该对象的所有定义属性都已存根
stub = build_stubbed(:user)

# 将一个块传递给上面的任何方法都将产生返回对象
create(:user) do |user|
  user.posts.create(attributes_for(:post))
end

# Build a User instance and override the first_name property
user = build(:user, first_name: "Joe")
user.first_name
# => "Joe"

factory :user, aliases: [:author, :commenter] do
  first_name { "John" }
  last_name { "Doe" }
  date_of_birth { 18.years.ago }
end

factory :post do
  author
  # instead of
  # association :author, factory: :user
  title { "How to read a book effectively" }
  body { "There are five steps involved." }
end

factory :comment do
  commenter
  # instead of
  # association :commenter, factory: :user
  body { "Great article!" }
end

factory :user do
  first_name { "Joe" }
  last_name  { "Blow" }
  email { "#{first_name}.#{last_name}@example.com".downcase }
end

create(:user, last_name: "Doe").email
# => "joe.doe@example.com"

factory :post do
  title { "A title" }

  factory :approved_post do
    approved { true }
  end
end

approved_post = create(:approved_post)
approved_post.title    # => "A title"
approved_post.approved # => true

factory :post do
  title { "A title" }
end

factory :approved_post, parent: :post do
  approved { true }
end

FactoryBot.define do
  factory :author

  factory :post do
    author
  end
end

post = build(:post)
post.new_record?        # => true
post.author.new_record? # => true

post = create(:post)
post.new_record?        # => false
post.author.new_record? # => false