TLDR: This card explains which threads and processes interact with each other when you run a Selenium test with Capybara...
tl;dr: Using has_many associations with a :through option can lead to lost or duplicate records. You should avoid...
Setting the colorbox opacity by hash parameter when initializing doesn't work the way like the documentation tells you.
On recent/fresh installations of Ruby 1.8.7 you may encounter this error why calling any bundled binary (or just bundle exec...
We've since created ActiveType which has a restricted subset of Virtus' features. It might be enough for your needs...
Just a quick note that Virtus can coerce (auto-cast) structured values like collections or maps: class Klass include Virtus.model...
When a Ruby block or proc takes multiple parameters, and you call it with an Array, Ruby will unexpectedly splat...
An annoying part of using font icons is that the icons usually need to live in the DOM. This is...
In Ruby, classes and modules are called constants. This card explains how Ruby resolves the meaning of a constant.
"CronMaker is a utility which helps you to build cron expressions." Check it out at http://www.cronmaker.com/.
Modern IRB has time measurement built in. measure # Enable measure :off # Disable Custom Should your version of IRB not offer...
Assert rmagick provision ... Gemfile gem 'rmagick', '2.13.2' # at this moment the latest stable version config/initializer/carrierwave.rb require 'carrierwave/processing/rmagick' ... and define a...
Before Rails 3.2.14, when supplying an invalid locale to I18n, it would fall back to its config.i18n.default_locale (which is...
Goal Within before_* Within after_* Cancel later callbacks throw :abort throw :abort Rollback the transaction throw :abort raise ActiveRecord::Rollback...
If you're still working on ruby 1.8, you should know that using SimpleDelegator is often prohibitively slow. I have...
This error occurs when you already have a database.yml which defines the database for the cucumber environment instead of test...
Say you have a User with a Carrierwave attribute #avatar: class User < ActiveRecord::Base mount_uploader :avatar, AvatarUploader end
When you want to find out the data type of an attribute, you can just use ActiveRecord's columns_hash...
Note - This is not a tutorial on setup or configuration of Secure Shell, but is an overview of technology which...
Rack::Attack is a rack middleware to protect your web app from bad clients. It allows whitelisting, blacklisting, throttling, and...
FastClick is a simple, easy-to-use library for eliminating the 300ms delay between a physical tap and the firing...
If you get a Quota error with OpenStack, it doesn't have to be what it tell. For example, I...
Sometimes you need to monitor a connection from your machine to a specific, single host or network in order to...
When I upgraded from 0.5.4 PDFKit deadlocked or crashed when an ApplicationController::RouteError occured. If this error happens only because...