tomily1

After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
brew unlink postgresql
brew install postgresql@9.6
brew unlink postgresql@9.6
brew link postgresql

tomily1

require 'forwardable'

class Blog
  def edit_post
    puts "Post edited"
  end

  def delete_post
    puts "Post removed"
  end

tomily1

Answers to [Ruby Interview Questions][1]

What is a class?

A text-book answer: classes are a blue-print for constructing computer models for real or virtual objects... boring.

In reality: classes hold data, have methods that interact with that data, and are used to instantiate objects.

Like this.

tomily1

Preamble

On OS/X Sierra, after recently running a brew update I started receiving the error message Sorry, you can't use byebug without Readline when trying to run some rake tasks in my ruby project folder. I observed this in projects and gems that include byebug or pry in their Gemfile or gem.spec. I've found in my googling that many begin encountering this error message after running a brew update but there are other triggering conditions as well.

>> rake aws:show_config
WARN: Unresolved specs during Gem::Specification.reset:
      mime-types (>= 0)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.
 Sorry, you can't use byebug without Readline. To solve this, you need to

tomily1

require 'cgi'
require 'active_support'

def verify_and_decrypt_session_cookie(cookie, secret_key_base = Rails.application.secret_key_base)
  cookie = CGI::unescape(cookie)
  salt   = 'authenticated encrypted cookie'
  encrypted_cookie_cipher = 'aes-256-gcm'
  serializer = ActiveSupport::MessageEncryptor::NullSerializer

  key_generator = ActiveSupport::KeyGenerator.new(secret_key_base, iterations: 1000)

tomily1

$ cd ~/Library/Application\ Support/Postgres/var-10
$ \rm -f postmaster.pid

OR

$ \rm -f ~/Library/Application\ Support/Postgres/var-10/postmaster.pid

tomily1

module ActionDispatch
  module Routing
    class MarkdownFormatter
      def initialize
        @buffer = []
      end

      def result
        @buffer.join("\n")
      end

tomily1

<script>
  	function setGrades() {
		// Define those variables!
		var quiz1 = parseFloat(document.getElementById('quiz1').value);
		var quiz2 = parseFloat(document.getElementById('quiz2').value);
		var quiz3 = parseFloat(document.getElementById('quiz3').value);
		var quiz4 = parseFloat(document.getElementById('quiz4').value);
		var quiz5 = parseFloat(document.getElementById('quiz5').value);
		var quiz6 = parseFloat(document.getElementById('quiz6').value);
		var quiz7 = parseFloat(document.getElementById('quiz7').value);