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: base.rb
    path of file: ./repos/barcelona/lib/barcelona/plugins
    
    the code of the file until where you have to start completion: module Barcelona
  module Plugins
    class Base
      attr_accessor :model
      delegate :district, to: :mod
    
      def hook(trigger, origin, arg)
        method_name = "on_#{trigger}"
        if respond_to? method_name
          send(method_name, origin, arg)
        else
          arg
        end