Command examples

1_isolated_command.rb

# Common "result" returned by commands
class Result
  attr_accessor :successful, :value, :msg

  def successful?
    @successful
  end
  def fail(msg)
    @successful = false
    @msg = msg
  end
end

# An isolated command that uploads a file into our assets directory
class UploadMenuCommand
  def self.execute(new_file)
    @result = Result.new
    begin
      IO.write(Rails.root + 'app/assets/images/menu.jpg', new_file, mode: 'w+', encoding: 'ASCII-8BIT')
    rescue Exception => msg
      @result.fail(msg)
    end

    @result
  end
end