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November 03, 2014
Few days ago I've released a satellite gem for image_optim called image_optim_pack. It contains latest versions of nearly all binaries required by image_optim for Mac OS X and Linux platforms (e.g. works on Heroku). It should make optimizing images from terminal, ruby project or Ruby on Rails application even easier.
Tropical Ruby 2015, the beach Ruby conference, will take place during March 5–8th at Porto de Galinhas, a paradisiac beach located in the Brazilian northeast coast.

Avdi Grimm and Nick Sutterer are confirmed keynotes but the CFP is still open. If you want to give a talk or workshop, submit your proposal until December 7th.

Enjoy amazing conversations, stunning landscapes and a superb nature. Come and talk with some of the best Rubyists in this tropical conference.
Check out the second part of BDD on Rails with Minitest by Chris Kottom to see a step-by-step guide how you can use Minitest for complete feature implementation.
You can't expect customers to beat a path to your door because you have a great product. To succeed as a startup, you have to go out and recruit customers manually. Traction: A Startup Guide To Getting Customers gives a primer on how to market effectively. I've shared some nuggets and added some commentary as to why it matters for startups.
November 02, 2014
happy_place allows you to call js functions and pass in variables and partials. It has a simple interface which allows you to write object oriented javascript and use these objects in your controllers.

Here is an example posts controller setup that will respond to html and js. When format is js it will call the coffee script class with the index function passing in a partial with the html that you want to replace.

class PostsController
 def index
  @posts = Posts.all

  respond_to do |format|
    format.js { js partials: {posts: "posts"} }

You can put the following code anywhere but this is where I would put it

# app/assets/controllers/
class this.PostsController
  constructor: ->

  @index: (args) ->

No need for a js view!
Hello rubyists from all over the globe!
Just wanted to share with you our experience on delivering a big Rails 2 to 3 upgrade using a Canary Release approach.

I hope you guys enjoy the reading and feel free to ask any questions. Any feedback is much appreciated!
Green Ruby News #91
Another list of curated links about ruby, rails, webdev and other in Green Ruby News #91.
November 01, 2014
I've released tty-progressbar that displays progress bars in terminal and is super flexible. It is one of the components that is part of tty suite of tools. Please give it a try and let me know what you think!
In this article I discuss why and how to do virtualization in (Ruby) development. Both - Vagrant and Docker are used for initial setup. Provision is done by the separate gem - linux_provision (similar to Oracle Instant Client Provision and OSX Provision).
TheDataRoleBlockRails is a mix of 2 popular frontend solutions ai/evil-blocks and kossnocorp/role with few patches for SLIM and HAML.
Ruby is about to get red hot. Again.
Release notes here.

Notable additions:

- keyword arguments
- beginnings of Rubinius::Console
- Rubinius::Metrics

Please test your code and let us know if you see any issues. Thanks!
October 31, 2014
Memoization is an optimization technique where you cache the results of expensive method calls. When the method is called with the same set of arguments, the cached result is returned. In this post, we will look at how we can implement memoization using Ruby's metaprogramming features. [Continue reading...]
Anonymous functions and closures are a useful concepts included in most modern programming languages. Back to Basics: Anonymous Functions and Closures goes into depth in Ruby and JavaScript on this concept.
October 30, 2014
RSpec gives you a number of ways of setting up prior to test runs, but only some of these have direct analogs in Minitest. In this post, I show you the code that will let you approximate RSpec's features (and explain when and why you might want to avoid using it).
Not a fan of RVM or rbenv for installing Ruby on your production/development servers? Ruby 1.9.2, 1.9.3, 2.0.0, 2.1.x for Debian, Ubuntu, CentOS, RHEL, Fedora is now just a download away.
The very real danger with commenting code is that it becomes outdated while the codebase rapidly evolves. And out of date comments are far worse than no comments. So what's the alternative?How to write code that speaks for itself.
In this post we will explore how we've implemented feature flags in a current web-application we're working on. It's a very simple process which means there are no excuses not to use a feature flag in your application.
October 29, 2014
I just wrote article about Zopfli Compression Algorithm and Zopfli-ffi Ruby wrapper.
Last weekend I set myself to customize content_tag to allow dynamic tag generation.

Too vague? Head over to my blog and read about it ;)
Trailblazer introduces several new abstraction layers into Rails. It gives developers structure and architectural guidance and finally answers the question of "Where do I put this kind of code?" in Rails. My book's first sample chapter is available now as a free download.
October 28, 2014
ITTIA DB SQL is a proven choice for robotic data storage, providing a safe and efficient way to update and query local data on various embedded platforms. With ITTIA DB SQL, data is always available to multiple concurrent tasks and can be easily distributed to other robots and control systems . As a result, robots become autonomous data analysts and decision makers.
Delayed Job Plugin to kill Heroku worker processes!
I just published a post about how to test execution of a before_filter with RSpec custom matcher.
I’m so delighted with the new Active Job feature I decided to release a new example application and tutorial right now, rather than waiting for Rails 4.2 final. Here's Mailing List with Active Job plus an article, Updating to Rails 4.2. Of course, you can build it with Rails Composer.
You're working with a brand new library or feature, and you just can't understand the documentation. Maybe it's hard to set up, so you have to bounce between RDocs until you learn how everything fits together. Maybe the documentation doesn't even exist. Or maybe you just learn best by seeing lots of examples. You need some help. But where do you learn how to use a feature, if not its documentation?
We have just released version 2.2.0 of our Intercity Chef Repository
Take care of your joints! Replace `console.log` with `log` in your Rails App. 5 minutes gem for for Great Good!
Representable 2.1 Is Faster!
The new representable release allows to skip rendering and parsing of properties dynamically. This allows to exclude properties at run-time, e.g. to reflect permission restrictions. It also got faster and we added a debug mode to help understanding what Representable does internally.
October 27, 2014
The protected method visibility in Ruby is one of its more confusing aspects. I recently took a closer look at it, and found that it has an interesting use case. [Continue reading...]
Handling exceptions is really important. I wrote a short post on how to handle reentrancy and other failures in Sidekiq workers: Adding reentrancy and a on failure fallback for your Sidekiq workers
A lot of people use RSpec to do TDD/BDD, but in this two-part tutorial Chris Kottom shows step-by-step how you can use Minitest to do the same thing.
A couple of practical tips on setting up perfect pair programming configuration What’s a Pair to Do.
October 26, 2014
Green Ruby News #90
Green Ruby News #90 like every sunday night, some links of the week about ruby, rails, webdev and devops.

I have just launched - a SaaS app, which will bring out all the data from your Rails application to non-developer users in beautiful charts!

Writing export scripts to 3rd party analytics services was yesterday. Sunalytics uses Active Record to find the relationships between the database tables and presents them in a friendly interface.

Give me a shout of your impressions at support @ sunalytics . co

Thank you!
There was an article featured in RubyWeekly that mentioned business as an essential skill for developers. I used to blog about business and marketing, but stopped. That article encouraged me to start again. Here's a blog post on how to initiate word of mouth and reach more of your target customers.
Introducing ImageDrop gem
I just released the ImageDrop gem and demo. Good for avatars and such.

Transform the lowly file input field into sophisticated looking drag-and-drop targets, complete with a preview image and placeholder text, with only 988 chars of minified js.
October 25, 2014
I wrote an article about how rails handles exceptions in your app , have a look !
I just put together a beginner-level blog post which walks through steps to setup a development environment in XCode to help debug Ruby C extensions.
October 24, 2014
Data validation is an important piece in software architecture. Delegating this responsibility to models increase the cost of maintenance. Lotus offers a different and powerful approach to the problem.

[read the announcement]
Previous weekend I've participated in annual Rails Rumble 2014. I've build app/product called Aloo. This is the story behind it, some details and some problems that I've discovered on my journey.
Serving static assets with Rack
I think this is a pretty common scenario, and yet I struggled to find an example on how to do it. I was trying to build a single page application using AngularJS on the front-end and Cuba, a minimalistic web framework for Ruby running on top of Rack. Read it here
We published the part 2 and part 3 of the "Process Payment with Paypal in Rails" series!

Process Payments with Paypal in Rails, Part 2 - Charge Credit Cards
Process Payments with Paypal in Rails, Part 3 - Recurring Payments

Check them out!
October 23, 2014
Lita 4 released
Version 4 of Lita, the ChatOps framework for Ruby, has been released. Lita gives you a robot for your company's chat room which can serve as an interface for automated operations. Read the release announcement and upgrade guide for more details on what's new in the latest version and how to upgrade.
In Defense of Alias
I've been reading a lot of Ruby style recommendations lately, and I wanted to share a relatively unpopular opinion (with some justifications) in preference of "alias" over "alias_method".
The ROM project is being rebuilt using Sequel for RDBMS. Read more about it here.
How to score A+ in your ssllabs test: dev ops tips from a Ruby on Rails team.
I've just published follow up to our first Useful FactoryGirl methods post on the CookiesHQ blog. This one is about the building strategies in FactoryGirl.
October 22, 2014
Pronto performs quick automated code reviews with the help of various analysis tools (RuboCop, Brakeman, Flay, etc.) by checking only the introduced changes. And now it also lints your SCSS with the help of SCSS-Lint. Check it out: Pronto and pronto-scss.
Rails Crash Course
Check out my new book, Rails Crash Course! It's based on the curriculum I've used to teach Ruby on Rails to both new programmers and experienced web developers. Head to for more info, and use the discount code GEMS for 30% off. I'd love to hear what you think of the book, and I hope you find it a useful resource.