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class Array
  def remove(*args)
    string_params = ""
    args.each do |arg_item|
      string_params += arg_item
    end   
    flatten.collect { |k| k.delete string_params}
  end
 
  def repeat(int)
    initial_array = collect { |j| j.to_s.split * int}
    initial_array.flatten
  end
end

rb(main):001:0> require 'meta-test.rb'
=> true
irb(main):002:0> ["one", "two", "three"].repeat(3) 
=> ["one", "one", "one", "two", "two", "two", "three", "three", "three"]
irb(main):003:0>
 
irb(main):003:0> %w{one two three four five six seven eight nine ten}.remove("i","o") 
=> ["ne", "tw", "three", "fur", "fve", "sx", "seven", "eght", "nne", "ten"]

Metaprogramming with Ruby is fun, isn’t it?

What is Prawnto? Prawnto is is a rails plugin leveraging the new prawn library to produce compiled pdf views, as for me i’m using it for custom reporting tools.

OK, let’s getting back to the problem, what should you do is place prawnto definition in your method rather than in controller’s callbacks :

# /app/controllers/transactions_controller.rb

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def show
    prawnto :prawn => { :page_size => 'A4',
                                     :left_margin => 40,
                                     :right_margin => 30,
                                     :top_margin => 40,
                                     :bottom_margin => 30},
                                     :filename => "invoice_#{@transaction.id}_customer_#{@transaction.customer_id}.pdf"
    render :layout => false
end

# /app/views/transactions/show.pdf.prawn

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<%= link_to "Generate PDF", transaction_url(transaction.id, :format => 'pdf') %>

Hope this is useful, cheers

Ilustrasinya sebagai berikut :

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x = [1, 2, 3, 4]
y = ["1", "2", "3", 5]

Array x memiliki elemen dengan tipe data Integer sedangkan Array y memiliki String dan Integer yang sebenarnya jika String tersebut diubah tipe datanya menjadi Integer akan memiliki elemen yang hampir sama dengan Array x. Lalu bagaimana cara agar ketika kedua Array tersebut digabungkan kita mendapatkan Array dengan data yang unik?

Caranya sangat sederhana dan cukup satu baris saja di Ruby :
Dari String ke Integer

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irb(main):003:0> z = (x+ y).flatten.collect { |i| i.to_i } 
=> [1, 2, 3, 4, 1, 2, 3, 5]
irb(main):004:0> z.uniq
=> [1, 2, 3, 4, 5]

Dari Integer ke String :

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irb(main):005:0> z = (x+ y).flatten.collect { |i| i.to_s }
=> ["1", "2", "3", "4", "1", "2", "3", "5"]
irb(main):006:0> z.uniq
=> ["1", "2", "3", "4", "5"]

Atau bahkan Float

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irb(main):007:0> z = (x+ y).flatten.collect { |i| i.to_f }
=> [1.0, 2.0, 3.0, 4.0, 1.0, 2.0, 3.0, 5.0]
irb(main):008:0> z.uniq
=> [1.0, 2.0, 3.0, 4.0, 5.0]

Demikian, semoga bermanfaat

When:
Saturday, December 12nd at 10 AM

Where:
detikcom office
Gedung Aldevco Octagon Lt. 2,
Jl. Warung Jati Barat Raya No. 75
Jakarta Selatan
Google Map Link

Call me: 0818-0308-1790 if you get lost.

The building is across the street from the Pizza Hut Warung Buncit and Buncit Indah Busway Shelter. The entrance to the building is in back by the parking lot.

Topics:
We will have 2 presentations no longer then 30 minutes each:
BDD with Cucumber – by Kunto Aji (http://www.railsmine.net)
W2tags Live – by Widi Harsojo of Koprol (http://wharsojo.wordpress.com)

We are opening open submission, we welcome all your resources (codes, videos, documentations, slides, presentation) for our next meetup

Dan parahnya lagi, status terakhir yang muncul di blog ini selalu tweet tersebut, padahal saya sudah mengubah password dan memasang beberapa status.

Akhirnya saya menonaktifkan plugin tersebut dan menggunakan snippet sederhana seperti di sini :

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function wp_echoTwitter($username){
     include_once(ABSPATH.WPINC.'/rss.php');
     $tweet = fetch_rss("http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=1");
     echo $tweet->items[0]['atom_content'];
}

Copy paste snippet di atas di file functions.php themes anda, jangan lupa filenya disimpan. Lalu tambahkan code seperti ini di themes anda.

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<?php wp_echoTwitter('gozali'); ?>

simpan dan selesai, insyaAllah aman dari scam :p

With the tools you can try w2tags online, you don’t need to install the gem on your machine, just type your code on the textarea available then it will render the results, as simple as that.

Next up Gerry Leo Nugroho (Product Planner – Detik) will be giving a presentation titled “Internet Product Planning, A Procedure”.

And Michael Smith (Klasifikasia) will close our presentation section with his presentation about Rails Deployment with Vlad and Mercurial.

Looking forward to hangin with you guys at the meeting, hopefully see you there..

You can RSVP via Facebook Event

Penyebabnya ternyata adalah ImageMagick dan RMagick belum terinstall di system, untuk kasus yang saya alami adalah menggunakan sistem ubuntu. Berikut langkah – langkahnya :

Install ImageMagick dan libmagick9-dev terlebih dahulu :

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sudo apt-get install imagemagick libmagick9-dev

Jika berhasil dilanjutkan dengan menginstall RMagick

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sudo gem install rmagick --no-rdoc --no-ri

Tambahkan parameter :styles di model, dan coba upload file kembali, insyaAllah berhasil

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has_attached_file :photo, :styles => { :normal => "100x100#", :small => ["70x70>", :jpg] }

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require 'rubygems'
require 'hpricot'
require 'open-uri'
 
class Property < ActiveRecord::Base
class << self
def scrap(page)
  resultset = []
  doc = Hpricot open("http://www.xxxxx.com/property_list?page=#{page}")
  items = doc.search("html_tag")
  items.each do |item|
    title = item.at("h4").innerText.gsub(/(&nbsp;|\n|\s)+/im, ' ').squeeze(' ').strip unless item.at("h4").nil?
    link = item.at("a").attributes["href"].gsub(/(&nbsp;|\n|\s)+/im, ' ').squeeze(' ').strip unless item.at("a").nil?
    resultset << { :title => title, :link => link }
  end
  resultset
end
 
def get_latest_update
  Property.create!(scrap(1))
end

Balik lagi ke masalah task scheduling alias penjadwalan tugas, saya biasanya mengandalkan crontab, atau kalau lagi disiplin ya ngelirik ke backgroundDrb, tapi untuk tugas yang satu ini kayaknya terlalu ribet kalo pake BackgroundDrb dan saya lagi nggak pengen pake crontab.

Akhirnya saya menemukan solusi yang menurut saya sangat affordable di Rails Inside. Dan saya pun memutuskan untuk mempelajari Rufus Scheduler dengan proyek kecil tadi sebagai kelinci percobaannya. Bagaimana caranya?

Pertama pastinya install gem rufus-scheduler. Kalo perlu froze gem-nya ke vendor/gems.

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sudo gem install rufus-scheduler

Lalu buat file bernama task_scheduler.rb di dalam direktori config/initializers. Isinya kurang lebih seperti ini :

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scheduler = Rufus::Scheduler.start_new
 
scheduler.every("1h") do
   Property.get_latest_update!
end

Kita dapat memanggil metode yang ada di model langsung ke file task_scheduler tersebut, layaknya rake task. Mudah dan sederhana bukan? tanpa crontab dan lebih mudah dibaca serta di-maintain dibanding crontab.

How to add Apidock Search Engine to your Firefox?
Click this url http://apidock.com/ruby/search?query=Open and you will find Add Ruby quicksearch to your browser link.

Click the link and voila! You will get Ruby Search Engine on your browser

Happy searching