gistfile1.txt

# before


## model
class User
  after_create : call_3rd_api
  def call_3rd_api
    xxx
  end
end

## controller
class PostController
  def create
    user = User.new(:name => "xxdd")
    user.save
  end
end


# after

#controller
class PostController
  def create
    UserRepo.create(name)
  end
end

## model

class User
end

## lib/ 

class UserRepo
  def self.create(name)
    xxx
    User.create(:name => name)

    #  xxx 與 user 可以對調，看你的情境是什麼
  end

  def xxx
  end
end