Alwina Oyewoleturner AlwinaO

In an earlier video we took a look at Rack to build incredibly lightweight web applications with Ruby. Rack's toolkit allowed us to quickly throw to get a working application, but we did have to put a little effort into it once we wanted to build something a little more complex.

Sometimes you want a fast and simple framework for building a simple web application. Perhaps you only need to respond to a handful of routes, or you want the response time for a small part of a bigger application to be lighting fast. The Sinatra framework is made for just these moments.

Today let's take a quick look at this framework and see how quickly we can build lightweight web applications.

To get started we first need to install the Sinatra gem:

gem install sinatra

##User accounts with Sinatra (no BCrypt)

Create migration

A very basic schema for a user typically looks like this:

def change
  create_table :users do |t|
 t.string :username

Gemfile

gem 'simple_form'

Installation

rails generate simple_form:install

SHORTCUTS

Key/Command	Description
Tab	Auto-complete files and folder names
Ctrl + A	Go to the beginning of the line you are currently typing on
Ctrl + E	Go to the end of the line you are currently typing on
Ctrl + U	Clear the line before the cursor
Ctrl + K	Clear the line after the cursor
Ctrl + W	Delete the word before the cursor
Ctrl + T	Swap the last two characters before the cursor

	# a simple/configurable rake task that generates some random fake data for the app (using faker) at various sizes
	# NOTE: requires the faker or ffaker gem
	# sudo gem install faker - http://faker.rubyforge.org
	# OR
	# sudo gem install ffaker - http://github.com/EmmanuelOga/ffaker

	require 'faker'

	class Fakeout

	require 'rubygems'
	require 'bcrypt'
	require 'haml'
	require 'sinatra'

	enable :sessions

	userTable = {}

	helpers do

	#
	# Install the MYSQL driver
	# gem install mysql2
	#
	# Ensure the MySQL gem is defined in your Gemfile
	# gem 'mysql2'
	#
	# And be sure to use new-style password hashing:
	# http://dev.mysql.com/doc/refman/5.0/en/old-client.html
	development:

	#
	# This will force ActiveRecord to create proper `interval` column types in PostgreSQL
	#
	# def change
	# add_column :leases, :period, :interval
	# end
	#
	# This applies to a generated `schema.rb` file too.
	#
	# No special OID type is applied to an `interval` type. Rails will treat it as a string, although

	#!/opt/apps/ruby/ruby/bin/ruby
	require 'date'

	# The initial date format as a String
	my_date = "2013-10-03 21:03:46Z"

	# Convert the Date to a DateTime Object
	date_obj = DateTime.strptime(my_date,'%Y-%m-%d %H:%M:%S%Z')

	# Re-Format the date - returns a String

	class Integer
	def factorial
	result = 0
	self.downto(1) { \|number\| result == 0 ? result = number : result *= number }
	return result
	end
	end