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1. Create a starting directory and enter it

   mkdir test_setup && cd test_setup

2. Create a Gemfile inside of test_setup

3. Enter the following gems into your Gemfile:

   source "https://rubygems.org"

gem 'rspec'

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Fresh New App

1. Create new rails app: rails new appname -d postgresql -T
2. Enter in console: psql -U username
3. Enter: create role approle with createdb login password 'password1';
4. Edit development section in config/database.yml:
   1. uncomment username and change it's value to the role you created username: approle
   2. change password to one entered in role creation password: password1
5. Enter: rails db:setup

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Error: RecordNotFound Couldn't find User with 'id'="

Fix: as outlined on so

def current_user
  @current_user ||= User.find_by(id: session[:user_id]) if session[:user_id]
end

---

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Deploying a subfolder to GitHub Pages

Sometimes you want to have a subdirectory on the master branch be the root directory of a repository’s gh-pages branch. This is useful for things like sites developed with Yeoman, or if you have a Jekyll site contained in the master branch alongside the rest of your code.

For the sake of this example, let’s pretend the subfolder containing your site is named dist.

Step 1

Remove the dist directory from the project’s .gitignore file (it’s ignored by default by Yeoman).

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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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Presentation slides

Create a Gem - Make it a CLI - Add Rspec Tests

Create a Gem - Make it a Command Line Interface - Add Rspec Tests Using Bundler & Thor

#Creating your own Gem

1. Run this command in your Terminal. This creates and names all the files you need for your gem. We are going to create a Lorem Ipsum Generator; you can call it whatever you want but seeing as we are creating a Lorem Ipsum generator we'll call it lorem. Read about gem naming conventions.

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module Braze
  class << self
    attr_accessor :configuration
  end

  def self.configure
    self.configuration ||= Configuration.new
    yield(configuration)
  end

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module Facebook
  class EventHandler
    def call(record:, request_params:, type:)
      @record = record
      @request_params = request_params
      @facebook_pixel_id = Rails.configuration.analytics_facebook_pixel_id
      send_event(type)
    end
    
    private

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Set up and configure our DBMS of choice, MYSQL, to store and manage data. Additionally setup user credentials validation and reset MySQL default users, databases, etc.

sudo apt install -y mysql-server

After installation, it's recommended to purge some insecure default settings and lock down access to the database system. The first thing we should do is set a password for the root password (using mysql_native_password as our default authentication method**)** as by default it has none - a huge security risk.

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We will use an RHEL9 instance as our server. Additionally, we need to create and attach three 10GB volumes to our instance.

The volume must be in the same Availability Zone as the instance: