Scrape email from yellow pages and send them email with 300 second delay

em = []
(1..63).each do |i|
yp = Nokogiri::HTML(open("http://www.yellowpages.com.my/search.jsp?sfor=all&name=logistic&w=&p=#{i}"))
emails = yp.search("a.email").map{|x| x["onclick"].gsub("SqueezeBox.open('/plainmail.jsp?id=", "").split("',")[0] }
emails.each do |eid|
  t = Nokogiri::HTML(open("http://yellowpages.com.my/plainmail.jsp?id=#{eid}"))
  em.push(t.search("input").first["value"])
end
InvoiceMailer.inquiry(em).deliver
sleep 300
end

ruby on rails daemon

akob:ceramahonline akob$ rails plugin install git://github.com/dougal/daemon_generator.git
Initialized empty Git repository in /Users/akob/hak/ceramahonline/vendor/plugins/daemon_generator/.git/
remote: Counting objects: 25, done.
remote: Compressing objects: 100% (21/21), done.
remote: Total 25 (delta 2), reused 20 (delta 1)
Unpacking objects: 100% (25/25), done.
From git://github.com/dougal/daemon_generator
 * branch            HEAD       -> FETCH_HEAD
Daemon Generator
================

To get yourself rolling:
> sudo gem install daemons
> ./script/generate daemon

Then insert your code in the lib/daemons/.rb stub. All pid's and logs will live in the normal log/ folder.  This helps to make things Capistrano friendly.

Individual control script:
> ./lib/daemons/_ctl [start|stop|restart]

App-wide control script (I add this to my capistrano recipe's after_restart task):
> ./script/daemons [start|stop|restart]
akob:ceramahonline akob$

Ruby: concept of paginating

 paginating an array

Proof of Concept:

Preparing dummy array :

test = []
1.9.2p290 :053 > (1..50).each do |g|
1.9.2p290 :054 > test += [g]
1.9.2p290 :055?> end
=> 1..50
1.9.2p290 :056 > test
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50]

We know that test[1..5] will return [1, 2, 3, 4, 5] of elements.

Function to get the item number by 5 item per page.

1.9.2p290 :061 > def item_number page
1.9.2p290 :062?> perpage = 5
1.9.2p290 :063?> margin = perpage * (page - 1)
1.9.2p290 :064?> start = margin + 1
1.9.2p290 :065?> ending = page * perpage
1.9.2p290 :066?> return start..ending
1.9.2p290 :067?> end

Using the function to get page number 4

1.9.2p290 :069 > test[item_number 4]
=> [17, 18, 19, 20, 21]

happy arraying!