You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: create_service.rb
    path of file: ./repos/Portus/app/services/team_users
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module TeamUsers

    
    def execute
      return if team_user.nil?

      create_activity! if team_user.save

      team_user
    end