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class CreateAlbums < ActiveRecord::Migration[6.1]
  def change
    create_table "albums", force: :cascade do |t|
      t.string "title"
      t.string "performer"
      t.integer "cost"
      t.datetime "created_at", null: false
      t.datetime "updated_at", null: false
      t.datetime "last_purchased_at"
      t.integer "last_purchased_by"

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Rails naming conventions

General Ruby conventions

Class names are CamelCase.

Methods and variables are snake_case.

Methods with a ? suffix will return a boolean.

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#Heading 1 ##Heading 2 ###Heading 3 ####Heading 4 #####Heading 5 ######Heading 6

---

Paragraph

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Exercises

Variables and Print

Q1a) Ask user information, for ex: name, department, college etc and display them using print function

# Sample of how program might ask user input and display output afterwards
$ ./usr_ip.rb 
Please provide the following details

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Example inputs:

Variable	Value
key	the shared secret key here
message	the message to hash here

Reference outputs for example inputs above:

| Type | Hash |

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#!/bin/bash
#
# Ubuntu post-install script
#
# Author:
#   Marco Rougeth <marco@rougeth.com>
#
# Description:
#   A post-installation bash script for Ubuntu (13.10)
#

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Deploying a simple Rails application with AWS Elastic Beanstalk by Julien SIMON, Principal Technical Evangelist @ Amazon Web Services

18/02/2016   
http://www.slideshare.net/JulienSIMON5/deploying-a-simple-rails-application-with-aws-elastic-beanstalk
    
    1. . Create a Git repository with AWS CodeCommit 
      $ aws codecommit create-repository --repository-name blog --region us-east-1 --repository-description "ElasticBeanstalk demo" 
      $ git clone ssh://git-codecommit.us- east-1.amazonaws.com/v1/repos/blog
    
    2. Create a new Rails application

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code --install-extension alefragnani.Bookmarks
code --install-extension alexkrechik.cucumberautocomplete
code --install-extension Angular.ng-template
code --install-extension BitBelt.converttoasciiart
code --install-extension buenon.scratchpads
code --install-extension bung87.vscode-gemfile
code --install-extension castwide.solargraph
code --install-extension christian-kohler.npm-intellisense
code --install-extension christian-kohler.path-intellisense
code --install-extension codezombiech.gitignore

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#!/usr/bin/env sh

# checks to see if running 
launchctl list | grep elasticsearch
 
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.elasticsearch.plist
launchctl remove homebrew.mxcl.elasticsearch

pkill -f elasticsearch

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# This solution attempts to handle flattening of nested arrays gracefully
class CustomArray
  def flatten(array)
    raise 'input is not an array' unless array?(array)
    return [] if array.empty?

    recursive_flatten(array)
  end

  private