Unindent HEREDOCs in Ruby 2.3
In Ruby 2.3 you can use <<~ instead of <<- to automatically remove indentation from a HEREDOCs:
str = <<~MESSAGE
Hello Universe!
This is me.
Bye!
MESSAGE
str will now be:
Hello Universe!
This is me.
Bye!
Related cards:
The Ruby Object Model
In Ruby (almost) everything is an Object. While this enables a lot of powerful features, this concept might be confusing for developers who have been programming in more static languages, such as Java or C#. This card should help understanding t...
Upgrading Rails 2 from 2.3.8 through 2.3.18 to Rails LTS
This card shows how to upgrade a Rails 2 application from Rails 2.3.8 through every single patch level up to 2.3.18, and then, hopefully, Rails LTS.
2.3.8 to 2.3.9
This release has [many minor changes and fi...
Lightning Talk: Coverage based Test Case Prioritization in Ruby on Rails
For my computer science bachelor's thesis I programmed and evaluated a CLI Test Case Prioritization (TCP) tool for makandra. It has been written as a Ruby Gem and was tested and evaluated against one Ruby on Rails project....
The JavaScript Object Model: A deep dive into prototypes and properties
Speaker today is Henning Koch, Head of Development at makandra.
This talk will be in German with English slides.
Introduction
As web developers we work with JavaScript every day, even when our backend code uses anothe...
instance_eval behaves different in Ruby 1.8 and Ruby 1.9, use instance_exec instead
In Ruby 1.9, instance_eval calls the block the with receiver as the first argument:
- In Ruby 1.8,
receiver.instance_eval(&block)callsblock.call() - In Ruby 1.9,
receiver.instance_eval(&block)callsblock.call(receiver)
This will blo...
How to make changes to a Ruby gem (as a Rails developer)
At makandra, we've built a few gems over the years. Some of these are quite popular: spreewald (> 1M downloads), active_type (> 1M downloads), and geordi (> 200k downloads)
Developing a Ruby gem is different from developing Rails applications, w...
CarrierWave: Processing images with libvips
When you write your next CarrierWave uploader, consider processing your images with libvips instead of ImageMagick.
Reasons for libvips
There are several **upsi...
Integrating or upgrading makandra-rubocop
Introduction
Most of the time it is a tedious task to apply a code style guide to an existing code base as there are likely to be a lot of conflicts. At makandra we are using [makandra-rubocop](https://makandracards.com/makandra/62188-makandr...
Installing Ruby 2.3 or below on Ubuntu 17 and above
From Ubuntu 17, rbenv fails to install Ruby below 2.4 because of a mismatching OpenSSL dependency: it needs libssl1.0-dev for the installation process, but recent Ubuntus come with libssl-dev.
From the linked StackOverflow comment:
As fa...
Install RubyMine under Ubuntu
This card explains how to install RubyMine for the first time. If you want to upgrade an existing RubyMine installation (after legacy install) to a newer version, see How to upgrade RubyMine.