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For MacOS Catalina, visit Install mysql2 on MacOS Catalina

Problem

Installing mysql2 gem errors on MacOS Big Sur.

Solution

Make sure openssl is installed on Mac via Homebrew.

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module Taggable
  extend ActiveSupport::Concern

  included do
    attr_accessible :tags

    after_save :set_tags
    after_destroy :unset_tags
  end

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Understanding Facades in Laravel

What's a Facade?

The Laravel explination, shown below is confusing.

Facades provide a "static" interface to classes that are available in the application's service container. Laravel ships with many facades which provide access to almost all of Laravel's features. Laravel facades serve as "static proxies" to underlying classes in the service container, providing the benefit of a terse, expressive syntax while maintaining more testability and flexibility than traditional static methods.

Many examples use Cache::get('key') to demonstrate how a Facade works. Comparing the following code to the utility that a Facade provides.

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#Newbie programmer
def factorial(x):
    if x == 0:
        return 1
    else:
        return x * factorial(x - 1)
print factorial(6)


#First year programmer, studied Pascal