You cannot use Array#join on an array of strings where some strings are html_safe and others are not...

When you eagerly load an association list using the .include option, and at the same time have a .where on...

When using virtual attributes, the attached trait can be useful to automatically copy errors from one attribute to another.

There are two distinct ways of commenting Haml markup: HTML and Ruby. HTML comments This will create an HTML comment...

Rails 3, 4, 5, 6 config/application.rb config/environment.rb before the initialize! call (we don't usually edit this file)

Sometimes you want to fetch associations for an ActiveRecord that you already loaded, e.g. when it has deeply nested associations...

The Git stash does not work like a one-slot clipboard and you might shoot yourself in the foot if...