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Ruby on Rails for beginners
 

Ruby on Rails for beginners

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Introduction to Ruby and Introduction to Ruby on Rails basic concepts for beginners. The google presentation is even better in full screen ...

Introduction to Ruby and Introduction to Ruby on Rails basic concepts for beginners. The google presentation is even better in full screen https://docs.google.com/presentation/d/1EE0VuB_PkD2-8j5JNs6CUQHb4J9ToIgC7-IxYTojiS0/pub?start=false&loop=false&delayms=3000#slide=id.p

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    Ruby on Rails for beginners Ruby on Rails for beginners Presentation Transcript

    • I am Vysakh. I am a web developer.
    • In Ruby puts “Hello world”
    • Ruby is simply simple Just like english
    • Variables
    • You have - basket A with 10 apples - basket B with 20 apples. Find the sum and difference
    • basketa = 10 apples basketb = 20 apples sum = basketa + basketb => 10 + 20 = 30 difference = basketb - basketa => 20 - 10 = 10
    • basket_a = 10 basket_b = 20 sum = basket_a + basket_b difference = basket_b - basket_a In Ruby
    • It is just like what you wrote in your kindergarden answer sheet
    • Creator of Ruby - Matz
    • Running the code
    • Ruby is executed line by line So output of a single line/logic can be seen using irb
    • Opening up irb in the terminal Instead of executing as a program file. Useful for learning, debugging.
    • Conditionals
    • cold_weather = true if cold_weather puts “Wear something warm” else puts “Don’t wear something” end Ruby code
    • Most thing in Ruby is Object
    • 2.odd?() => false “Vysakh”.length() => 6
    • Brackets are optional in Ruby 2.odd? => false “Vysakh”.length => 6
    • Exercise 1 a) Get a string and check if it is palindrome. b) Get a number and print the reverse of it. Hint: use gets to get the input.
    • Array/List
    • In Ruby shopping = [ “milk”, “cheese”, “olive oil”]
    • Loops
    • In Ruby 20.times do puts “I must do my homework” end
    • Also, there are - loop - while loop - for loop - step - upto
    • HAPPY Ruby is all about making programmer
    • Mam, please take each item for me to bill
    • cart = [“biscuit”, milk”, “shampoo”, “tampons” ]
    • Mam, please take each item for me to bill cart = [“biscuit”, milk”, “shampoo”, “tampons” ] cart.each do |item| puts item end
    • Exercise 2 - Create an array of marks you got in your last assessment. - Find if the sum of odd numbers is greater than the sum of even numbers, if it is, you have big odds at passing. - Pass this information or bad luck will follow
    • HASH
    • In Ruby slang = { “lol” => “laugh out loud”, “brb” => “Be right back” } slang[“lol”] => laught out loud
    • Use symbols instead of string slang = { :lol => “laugh out loud”, :brb => “Be right back” } slang[:lol] => laught out loud
    • Symbols in Ruby :hand.class => Symbol
    • Alternate way to write hash slang = { lol: “laugh out loud”, brb: “Be right back” } slang[:lol] => laught out loud
    • Exercise 3 - Create a list of ipl team hashes - with batsmen (3) name as key and their sixes as values. a) Find the sixes hit by a batsmen of a given name
    • Functions
    • In Ruby def y(x) x**3 end y(3) # => 27 y(2) # => 8
    • Exercise 4 a) Create a method rajini_style. Return his dialogue (your favorite). b) Create a factorial method that gets a number and returns the factorial
    • Class
    • class Sports def initialize(players, name) @no_of_players = players @name = name end end cricket = Sports.new(11, “Cricket”) foot_ball = Sports.new(11, “Football”)
    • Inheritance
    • a version manager (RVM or rbenv or other) Install ruby using
    • rbenv Installing Ruby using
    • Installing and setting Ruby
    • dhh Creator of Ruby on Rails
    • Installing Rails
    • Creating a new rails project
    • Files generated with “rails new myproject” command
    • Starting Rails server
    • Check the browser localhost:3000
    • Understanding Rails
    • A dress shop Pant section? 1st floor kid. 2nd section
    • 1st floor here is your pant
    • A Rails server /about routes.rb home controller, about action
    • A Rails server home controller, about action here is your html file
    • Lets do it in Rails
    • filename: config/routes.rb Configure the routes to get /about
    • The corresponding html
    • and go to ‘/about’ url Lets open the browser
    • available in the section? When the pant is not Coming back to the kid and pant story
    • 1st floor I want this specific design Godown Oh kid lemme go to the godown and get
    • In Rails Database home controller, about action /posts/1
    • and have an abstraction(model) Lets create a table
    • This will create model, migration files
    • migration - A ruby file that will create, modify tables posts table title column of type string
    • from the ruby file(migration) Lets create the tables
    • Rake, a simple ruby build program with capabilities similar to make This creates the posts table
    • table records through Rails model Lets create, manipulate
    • Post is a Ruby class that Inherits ActiveRecord app/models/post.rb
    • Object Relation Mapping(ORM) layer Active Record is an
    • tables map to classes,
    • rows map to objects rows map to objects Rows map to objects Columns map to object attributes
    • Few operations
    • Lets use this query in Rails controller and give it to the user
    • Configure the routes file
    • Open up the browser
    • Show the title, description in html app/views/show.html.erb
    • Now lets check the browser
    • Now lets do all this in one command -> scaffold
    • This will generate all files based on REST Architecture
    • Guides and resources
    • http://tryruby.org http://www.codecademy.com/en/tracks/ruby http://ruby.learncodethehardway.org/book/ Ruby
    • Ruby on Rails railstutorial.org/book railsforzombies.org guides.rubyonrails.org/getting_started railscasts.com
    • Local Ruby Community - chennair.b Mailing list - google groups Meetups - www.meetup.com/chennai-ruby