Create a new gemset with RVM

This card will show you a cool way to define a class using Struct.new.
A common usecase for Structs are temporary data structures which just hold state and don't provide behaviour. In many cases you c...

I found a nice script on crazylittlehacks and modified it slightly. Put the attachment to /usr/local/bin, chmod +x and run it like this:

tab

You m...

To open a terminal quickly navigate to System → Preferences → Keyboard Shortcuts. There, click the "Run a terminal" row (It should be in the "Desktop" section) and press the keyboard shortcut you like.

If you cannot find such an entry you may nee...

Create a user without password (recommended)

Replace newuser with your desired username:

mysql -uroot -p
CREATE USER 'newuser'@'localhost' IDENTIFIED BY '';
GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost';
FLUSH PRIVILEGES;
exit;...

Until recently, you could open a new tab via window.open when using execute_script in Selenium tests. It no longer works in Chrome (will show a "popup blocked" notification).

This is because browsers usually block window.open unless the use...

If you are using Angular and want something like Rails' simple_format which HTML-formats a plain-text input into paragraphs and line breaks, this directive is for you.

Any ...

When loading a database dump created with pg_dump into your database, you might run into an error like

pg_restore: error: unsupported version (1.15) in file header

This is because your local pg_restore version is too old to match the...

Option 1: Creating a self-signed certificate with the openssl binary

As igalic commented on this gist.

openssl req -new -newkey rsa:2048 -sha256 -days 365 -nodes...

Slow test suites are a major pain point in projects, often due to RSpec and FactoryBot. Although minitest and fixtures are sometimes viewed as outdated, they can greatly improve test speed.

We adopted a project using minitest and fixtures, ...

The following snippet demonstrates how you could create excel files (with spreadsheet gem) and format columns so that they follow a specific number format like currencies or dates do.

require 'rubygems...