# File lib/rails_generator/commands.rb, line 479
        def migration_template(relative_source, relative_destination, template_options = {})
          migration_directory relative_destination

          migration_file_name = template_options[:migration_file_name] || file_name
          unless migration_exists?(migration_file_name)
            puts "There is no migration named #{migration_file_name}"
            return
          end


          existing_migrations(migration_file_name).each do |file_path|
            file(relative_source, file_path, template_options)
          end
        end