Re-creating a complex ActiveRecord scenario quickly without setting up a full-blown Rails app can come in handy e.g...
There are times when you have a chunk of text that you want to do something with, e.g. replace something...
TL;DR Under certain circumstances, dynamically defined symbols may break keyword arguments in Ruby 2.2. This was fixed in Ruby...
It is a common misunderstanding that all [op]=-operators work the same way, but actually they don't. ||= and &&=
When using send_file (for example for attachments of any kind), make sure your application knows the correct mime types...
You can freeze any Ruby object to prevent further modification. If you freeze an ActiveRecord and try to set an...
In RSpec you can tag examples or example groups with any tags you like simply by saying describe ReportCreator, slow...
If you want to grow a Ruby Array, you might find out about #fill but it is not really what...
Code folding is a very useful feature to me. It gives me a quick overview over a file and keeps...
When using threads, you must make your code thread-safe. This can be done by either locking (mutexes) all data...
Today I learned that Ruby on Rails has shipped with a built-in slug generator since Rails 2.2:
Nested exceptions for Ruby: When you rescue an error and then re-raise your own, you don't have to...
Web applications can be used by multiple users at the same time. A typical application server like Passenger has multiple...
If you need to log to a file you can use Ruby's Logger class: require 'logger'
Dusen (our search gem) is now capable of excluding words, phrases and qualified fields from search. E.g. search for
This is useful to kill processes like ruby my-script.rb: pkill -f my-script.rb With great power comes great responsibility.
You can hook into Slack when using Capistrano for deployment. The slackistrano gem does most of the heavy lifting for...
If you're on Ruby 2.3+ there's a <<~ operator to automatically unindent HEREDOCs: str = <<~MESSAGE Hello Universe!
See this Railscast. Basically you can simply write views like index.xlsx.erb: ID Name Release Date Price <% @products.each do |product| %> <%= product.id...
If you want to sort values from an enumerable into two arrays based on whether they match a certain criteria...
The linked article explains how to get a database-wide lock without creating table rows: This article explains how I...
Postgres 9.4 introduces a new column type: jsonb. json and jsonb columns store data differently, so just compare the two...
Enumerable#count can do three things. With no argument provided, it returns the number of items. With an argument, it...
Array#flatten by default flattens an array recursively. To only flatten the array for e.g. one level, it takes an...