Day11 测试写起乃-FactoryBot-create、build、build_stubbed

建立bot

官方文件有说有以下建立方式至於差别在哪呢？

# Returns a User instance that's not saved
user = build(:user)

# Returns a saved User instance
user = create(:user)

# Returns a hash of attributes that can be used to build a User instance
attrs = attributes_for(:user) # {name: 'CK', phone: '123'}

# Returns an object with all defined attributes stubbed out
stub = build_stubbed(:user)

# Passing a block to any of the methods above will yield the return object
create(:user) do |user|
  user.posts.create(attributes_for(:post))
end

create => 真的写进db

build => 还没save 且 id为 nil

build_stubbed => stub 的概念创建一个假的实体而且还有 id

attributes_for => 拿到 FactoryBot 的 attribute

我平常使用起来，如果你建立的资料能不进就不进！速度会快上很多！

因为有时候建立资料的时候关联的问题可能你只需要测试 profile 但一定要有 user，这时候 user 就可以用 build_stubbed，既能拿到资料也能不会进db commit！

如果还是不懂build、create、build_stubbed的可以看看这篇
FactoryGirl create vs build vs build_stubbed
attributes_for