Coupons limiting to Collection ID

coupon.rb

# http://forums.shopify.com/categories/6/posts/42926
# This is a fairly simple mechanize script to create a few hundred or so shopify discounts from a CSV of groupon codes.
# You'll want to change all of the "changeme" values to your own.
# The script expects there to be a groupon_codes.csv in the same directory.
#
# The groupons_code.csv should look like this:
# 8m7677
# 8m6749
# 8m5398
# 8m7699
# 8m8885
# 8m788
# etc.

require 'rubygems'
require 'mechanize'
require 'csv'

BASE_URL = 'https://XXXXXXX.myshopify.com/admin'
LOGIN_PATH = '/auth/login'

USER = 'XXXXXXXXXXX'
PASSWORD = 'XXXXXXXXXXXX'
DISCOUNT = "20"

@agent = Mechanize.new
@groupon_codes = []

def login
  page = @agent.get(BASE_URL + LOGIN_PATH)
  form = page.forms.first
  form.login = USER
  form.password = PASSWORD
  @agent.submit(page.forms.first)
end

def load_codes
  
  #@groupon_codes = CSV.read("groupon_codes.csv").flatten
  @groupon_codes = []
  allowed_chars = %w(A C D E H J K L M N P T V W X Y 3 4 6 7 9)
  5000.times do
    unique_chars = allowed_chars.dup
    s = "RCR-ISUPPORTINDIEGAMES-"
    10.times do
      char = unique_chars[rand(unique_chars.length)]
      s << unique_chars.delete(char)
    end
    @groupon_codes << s
    raise "duplicated code generated" if @groupon_codes != @groupon_codes.uniq
  end
end

def create_discount(page, code)
  puts "Create discount for code: #{code}..."
  # You may want to have some error handling in case you have connection issues. Worked fine for me with 500+ codes though.
  begin
    page.form_with(:action => "#{BASE_URL}/discounts") do |f|
      f['discount[code]'] = code
      f["discount[usage_limit]"] = '1'
      #f[""] = 'Collection'
      f["type"] = "percentage"
      #f["discount[applies_to_id]"] = "7051722"
      #f["applies_to_product"] = "76668552"
      #f["applies_to_collection"] = "504322"
      #f["applies_to_customer_group"] = "1122452"
    
      #p f.fields_with(:name => 'discount_[value]').length
  
      # Set both the visible and hidden textfield to ensure the value gets sent
      discount_value_fields = f.fields_with(:id => 'discount_value')
      discount_value_fields.each do |textfield|
        textfield.value = DISCOUNT
      end
      f.fields_with(:name=>'discount[applies_to_id]').each do |textfield|
        textfield.value = "7051722"
      end
      f.fields_with(:name=>'discount[applies_to_type]').each do |textfield|
        textfield.value = "Collection"
      end
    end.click_button
    $file.write "#{code}\n"
  rescue
    STDERR.print "Failed to save code: #{code}"
  end
end

load_codes
login

#p @groupon_codes

$file = File.open("rcr_codes.txt","w")

begin
  @agent.get(BASE_URL + '/marketing') do |page|
    @groupon_codes.each do |code|
      create_discount(page, code)
    end
  end
ensure
  $file.close
end