delegate demo, use helpers and url_helper outside controller or helpers ....

generate_source_tracker.rb

## rails runner script/generate_source_tracker_link.rb
#eg: version_number: 20130116-1-1 #data-1(早)/2(晚)-1(article_number)
class GeneraterSourceTracker
  #include ActionView::Helpers
  #include ActionView::Helpers::UrlHelper
  include Rails.application.routes.url_helpers
  delegate :url_helpers, to: 'Rails.application.routes'
  delegate :helpers, to: 'ActionController::Base'
  
  def tracker_url(source_tracker)
    #new_source_tracker_url(source_tracker: source_tracker, host: "cms.bbtang.com")
    url_helpers.new_source_tracker_url(source_tracker: source_tracker, host: "cms.bbtang.com")
  end
  
  def image_tracker(source_tracker)
    helpers.image_tag(tracker_url(source_tracker), width: "0", height: "0", alt: "")
  end
end

generater_source_tracker = GeneraterSourceTracker.new
source_tracker = {platform: "weixin", from: "fumutang", version_number: "20130116-1-1"}

html = generater_source_tracker.image_tracker(source_tracker)

puts html.html_safe