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: 20170928160527_remove_address_fields.rb
    path of file: ./repos/catarse/db/migrate
    
    the code of the file until where you have to start completion: class RemoveAddressFields < ActiveRecord::Migration
  def change
    execute <<-SQL
      alter table contributions drop column address_city;
      alter table contributions drop column address_complement;
      alter table contributions drop column address_street;
      alter table contributions drop column address_number ;
      alter table contributions drop column address_state ;
      alter table contributions drop column address_phone_number ;
      alter table contributions drop column address_neighbourhood ;
      alter table contributions drop column address_zip_code ;
      
    
  def change
    execute <<-SQL
      alter table contributions drop column address_city;
      alter table contributions drop column address_complement;
      alter table contributions drop column address_street;
      alter table contributions drop column address_number ;
      alter table contributions drop column address_state ;
      alter table contributions drop column address_phone_number ;
      alter table contributions drop column address_neighbourhood ;
      alter table contributions drop column address_zip_code ;
      alter table contributions drop column country_id ;

      alter table users drop column address_city;
      alter table users drop column address_street;
      alter table users drop column address_complement;
      alter table users drop column address_number ;
      alter table users drop column address_state ;
      alter table users drop column phone_number ;
      alter table users drop column address_neighbourhood ;
      alter table users drop column address_zip_code ;
      alter table users drop column country_id ;
      alter table users drop column address_country ;

    SQL
  end