GT Web Developers - Rails Intro

I was asked to give a brief overview of Rails & how it does MVC.

Students had already used Ruby & Sinatra and been exposed to some basic MVC subjects, but nothing too comprehensive. Next week they'd be diving more into code, and this was supposed to be a more high level overview

Transcript

1. Let talk Rails
2. I’m Mike or @skalnik
3. I work at GitHub
4. http://github.com/edu We :heart: Students Get a free Micro account!
5. Rails? Why
6. Rails is a web framework
7. a Rails is kitchen sink Tries to include everything you’d need
8. Rails makes life easy It does have a learning curve though. Once you get past it though, it lets you do stuff quick
9.  ONE SEC! Before we go on…
10. Linux Users Make sure to install sqlite3 libsqlite3-dev Rails uses SQLite for local dev, so make sure you have it. OS X comes with it. Rails Installer includes it.
11. $ gem install rails
14. $ cd my_billion_dollar_idea What’s that find thing do? 88 FILES!? Lets look into this…
15. $ find . | wc -l $ cd my_billion_dollar_idea What’s that find thing do? 88 FILES!? Lets look into this…
16. $ find . | wc -l 88 $ cd my_billion_dollar_idea What’s that find thing do? 88 FILES!? Lets look into this…
17. $ find . | wc -l 88 $ open . $ cd my_billion_dollar_idea What’s that find thing do? 88 FILES!? Lets look into this…
19. OH SHI— WTF HALP
20. App is where our shit lives! And we got these models, views, and controllers directories in there…
21. App is where our shit lives! And we got these models, views, and controllers directories in there…
22. App is where our shit lives! And we got these models, views, and controllers directories in there…
23. App is where our shit lives! And we got these models, views, and controllers directories in there…
24. Lets generate some stuff before going forward. The exact command isn’t too important, but…
25. Model contains business logic “Models your data” Responsible for behavior & data Usually database backed, but not always Lets check one out
26. class Post < ActiveRecord::Base belongs_to :author has_many :comments attr_accessible :title, :body end ActiveRecord? -> ORM & DSL We can define relationships! And whitelist attributes that can be updated
27. displays View information HTML, XML, JSON, etc Templated with things like ERB, Mustache, etc
28. Under a pluralized model name directory Each folder is an “action” -> controller actions partials start with _ -> views you can render in other views
29. Under a pluralized model name directory Each folder is an “action” -> controller actions partials start with _ -> views you can render in other views
30. Under a pluralized model name directory Each folder is an “action” -> controller actions partials start with _ -> views you can render in other views
31. Under a pluralized model name directory Each folder is an “action” -> controller actions partials start with _ -> views you can render in other views
32. handles the other two Controller
33. class PostsController < ApplicationController def index @posts = Post.all respond_to do |format| format.html format.json { render json: @posts } end end end Index action! We can see different kinds of responses (How are these communicated to Rails?)
34. Controller Browser View Model Browser sends request which controller sees Controller coordinates with Model Passes values to view View renders values and sends to browser
35. Controller Browser View Model Browser sends request which controller sees Controller coordinates with Model Passes values to view View renders values and sends to browser
36. Controller Browser View Model Browser sends request which controller sees Controller coordinates with Model Passes values to view View renders values and sends to browser
37. Controller Browser View Model Browser sends request which controller sees Controller coordinates with Model Passes values to view View renders values and sends to browser
38. Controller Browser View Model Browser sends request which controller sees Controller coordinates with Model Passes values to view View renders values and sends to browser
39. Controller Browser View Model Browser sends request which controller sees Controller coordinates with Model Passes values to view View renders values and sends to browser
40. Assets: CSS, Javascript, Images Moved recently due to growing importance
41. Config has a bunch of configuration (mind blowing, eh?) initializing settings, sets up the routes, database configuration
42. Config has a bunch of configuration (mind blowing, eh?) initializing settings, sets up the routes, database configuration
43. Config has a bunch of configuration (mind blowing, eh?) initializing settings, sets up the routes, database configuration
44. Config has a bunch of configuration (mind blowing, eh?) initializing settings, sets up the routes, database configuration
45. MyBillionDollarIdea::Application.routes.draw do resources :posts match 'admin' => 'admin#dashboard' end Rails tries to be “RESTful” -> give brief overview. Basically a set of standards for HTTP admin#dashboard?! -> Explain DSL, specifically AdminController Dashboard action
46. Questions? Any
47. Thanks! http://bit.ly/gt-rails-intro