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ruby

How to create and configure EC2 instances for Rails hosting with CentOS using Ansible

Introduction In this quite extensive post I will walk you through the process of creating from scratch a box in EC2 ready to use for deploying your Rails app using Ansible. In the process I will show how to write a simple module that, while not necessary, will illustrate some points as well. Keep in […]

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Create a temporary zip file to send as response in Rails

We have been doing a painful migration from Rails 2 to Rails 3 for several months at work, and refactoring some code the other day I had to do something in a non straightforward way, so I thought I’d share that. Basically we had an action that would group several files into a zip file […]

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Sending emails using Google Mail with Ruby

It’s no secret that Google Mail has become, over the last years, the most widely used email server and client on the world. Not only it’s basically free, but with the use of Google Apps you can even use it on your own domains. Because so many people use it, even system administrators, it may […]

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A Ruby implementation of the FizzBuzz test using the Enumerator class

Some days ago I learnt about The FizzBuzz Test and did a simple implementation in Ruby. The FizzBuzz test is a simple algorithm that is supposed to do the following: For each number from 1 to 100: If the number is divisible by 3, print “Fizz” If the number is divisible by 5, print “Buzz” […]

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Give your Ruby console a dash of colour

When you’re developing an application in Rails (or Ruby), you spend lots of time in the IRB, the Interactive Ruby Shell. Usually just to test some Ruby code, start an application console or debug something going on inside the project. Yesterday, looking at a coworker screen, I saw he had his console with lots of […]

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Fix Java GUI applications in xmonad

If you ever try to run a GUI Java application when using xmonad as the Window Manager, you’ll probably end up with a nice flat grey window where your buttons, toolbars and other desktop GUI goodies should be. I ran into that problem the other day when trying to evaluate the RubyMine Ruby on Rails […]

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Ruby on Rails Many To Many associations with multiple databases

Sometimes you need to use multiple databases in your Rails projects. Usually when some data must be shared between different applications. When this happens you usually have some models in a shared database, and some other models in the specific application database. This can be easily done using the establish_connection method in the shared models […]

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Iterate over a collection in groups, and other things

One thing I find fascinating about Ruby is the fact that most common tasks are already programmed for you in its library. The Enumerable module is a clear example of that, providing you with lots of functionality to manipulate collections of objects. One of those useful methods I discovered the other day was each_slice. This […]

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Easily select random records in rails

If you ever wondered how to easily retrieve a random record in an ActiveRecord model, here’s en easy way to do that: use the sample method. sample is a class method from the Array class that retrieves one or more random items from an array instance. It conveniently returns nil or an array lesser than […]

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Fixtures and serialized attributes in Ruby on Rails

If you’ve ever used the serialize method in an ActiveRecord model, you may have faced the problem of writing a fixture for that particular serialized field. The serialize method is quite handy if you need to store a complex object (like a Hash or an Array) in a database field, without having to create additional […]

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