扩展Ruby类的正确方法？

Question

I am trying to extend the Smtpapi::Header class in order to stay DRY. Is this the proper way to set these original Smtpapi setters in my extension? I am new to Ruby.

  class CustomMailerHeader < Smtpapi::Header

    def initialize(params)

        super
    end

    def no_service_header
          self.add_category("Service Down Email")
          self.add_filter('templates', 'enable', 1)
          self.add_filter('templates', 'template_id', '8bawd1-9e66') 
          self.add_substitution('-|A_MESSAGE|-', ['server down'])
          self.set_tos('admin@admin.com')
          self
    end

end

Then use it like this

header = CustomMailerHeader.new.no_service_header

Answer 1

That'll work, though CustomMailerHeader.new would just be the same thing as CustomMailerHeader.new so you can abstract away the no_service_header and clean it up a bit:

def initialize
  super
  no_service_header
end

private

def no_service_header
  add_category("Service Down Email")
  add_filter('templates', 'enable', 1)
  add_filter('templates', 'template_id', '8bawd1-9e66') 
  add_substitution('-|A_MESSAGE|-', ['server down'])
  set_tos('admin@admin.com')
end

Usage:

header = CustomMailerHeader.new