removing conditional and working with provided callbacks

gistfile1.rb

class UserController < ApplicationController
  def create
    @user_creation = UserCreation.new(self)

    @user_creation.on_success { redirect_to users_path }
    @user_creation.on_failure { render :new }

    @user_creation.please_create_an_user_as_admin(params[:user])
  end
end

# This could be provided through a block, adding a bit of syntactic sugar:

@user_creation = UserCreation.new(self) do
  on_success { redirect_to users_path }
  on_failure { render :new }
end