Ruby Decorator Design Pattern for BBC: with a little imagination you can see how we could store data in S3 instead of “printing” it to the screen AND also how we could have some models extend based on a whitelist (as some components you’ll want to extend ALL formatters, and other components you’ll only want to extend from one or two formatters)

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Ruby Decorator Design Pattern for BBC.rb

require "json"

module HtmlFormatter
  def render
    p "<p>HTML content</p>"
    super
  end
end

module JsonFormatter
  def render
    p JSON.generate :foo => :bar
    super
  end
end

module EnvelopeFormatter
  def render
p <<EOF
{
  "head": [
    "<link ... />",
    "<link ... />",
    "<meta ... />,",
    "<script ... />"
  ],
  "bodyInline": "<p>Some HTML here</p>",
  "bodyLast": [
    "<script>alert('script A');</script>",
    "<script>alert('script B');</script>"
  ]
}
EOF
    super
  end
end

class Model
  def render
    p "Plain Text"
  end
end

component = Model.new

component.extend(HtmlFormatter)
component.extend(JsonFormatter)
component.extend(EnvelopeFormatter)

component.render

=begin
"{\n  \"head\": [\n    \"<link ... />\",\n    \"<link ... />\",\n    \"<meta ... />,\",\n    \"<script ... />\"\n  ],\n  \"bodyInline\": \"<p>Some HTML here</p>\",\n  \"bodyLast\": [\n    \"<script>alert('script A');</script>\",\n    \"<script>alert('script B');</script>\"\n  ]\n}\n"
"{\"foo\":\"bar\"}"

"<p>HTML content</p>"

"Plain Text"
=end