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Simple Web Apps With Sinatra
- 1. Simple Web Apps With Sinatra
- 2. Micro web apps with Sinatra
- 7. Ruby sudo gem install sinatra
- 9. Ruby require ‘rubygems’ require ‘sinatra’ get ‘/’ do #do stuff end post ‘/’ do #do stuff end
- 10. MVC Model Controller View
- 11. MVC Model Controller View Data Presentation
- 12. MVC Model Controller View Data Presentation { "id": "2902652", "name": "Al Shaw", "first_name": "Al", "last_name": "Shaw", "link": "https://www.facebook.com/ashaw", "username": "ashaw", "gender": "male", "locale": "en_US" }
- 13. MVC Model Controller View Data Presentation { "id": "2902652", "name": "Al Shaw", "first_name": "Al", "last_name": "Shaw", "link": "https://www.facebook.com/ashaw", "username": "ashaw", "gender": "male", "locale": "en_US" }
- 14. MVC Model Controller View Data Presentation get ‘/profile/:id’ do # request data for :id from FB API # pass to view end { "id": "2902652", "name": "Al Shaw",
- 15. MVC Model Controller View Data Presentation post ‘/profile’ do # pass new values from user input # to Model end { "id": "2902652", "name": "Al Shaw",
- 16. Let’s do it! require ‘rubygems’ require ‘sinatra’ require ‘open-uri’ require ‘json’ get ‘/profile/:id’ do user = params[:id] profile = open(“http://graph.facebook.com/#{user}”).read profile = JSON.parse(profile) “<h2>” + profile[‘name’] + “</h2>” end
- 17. Let’s do it! ashaw@Al-Shaws-MacBook-Pro rails $ ruby fb.rb
- 19. 1. Require Libraries require ‘rubygems’ # lets you use libraries require ‘sinatra‘ # our micro web framework require ‘open-uri’ # for requesting URLs require ‘json‘ # for parsing JSON
- 20. 2. A get block get ‘/profile/:id’ do # do stuff end URL parameter http://localhost:4567/pro le/ashaw params[:id]
- 21. 3. Capture parameters get ‘/profile/:id’ do user = params[:id] end
- 22. 4. Call & Parse FB API get ‘/profile/:id’ do user = params[:id] profile = open(“http://graph.facebook.com/#{user}”).read profile = JSON.parse(profile) end http://graph.facebook.com/ashaw { {"name"=>"Al Shaw", "id": "2902652", "username"=>"ashaw", "name": "Al Shaw", "first_name": "Al", "gender"=>"male", "last_name": "Shaw", "id"=>"2902652", "link": "https://www.facebook.com/ashaw", "last_name"=>"Shaw", "username": "ashaw", "locale"=>"en_US", "gender": "male", "locale": "en_US" "link"=>"http://www.facebook.com/ashaw", } "first_name"=>"Al"}
- 23. 5. Show what you want get ‘/profile/:id’ do user = params[:id] profile = open(“http://graph.facebook.com/#{user}”).read profile = JSON.parse(profile) “<h2>” + profile[‘name’] + “</h2>” end By default, last line in a block is an implicit view “<h2>” + profile[‘name’] + “</h2>”
- 24. And Now For Something Completely Different
- 25. Does x follow you on Twitter?
- 27. Actions ‘/‘ Collect user data ‘/follows‘ Show following status
- 28. Collect user names get ‘/‘ do #show form end
- 29. *Short interlude regarding views get ‘/‘ do get ‘/‘ do “Hello” erb :hello end end
- 30. *Short interlude regarding views get ‘/‘ do get ‘/‘ do “Hello” erb :hello end end Implicit view View Template
- 31. *Short interlude regarding views get ‘/‘ do get ‘/‘ do “Hello” erb :hello end end Implicit view View Template
- 32. View Templates followapp.rb views/index.erb get ‘/‘ do <html> erb :index <head> end ....
- 33. View Templates followapp.rb views/index.erb get ‘/‘ do <%= @foo %> @foo = ‘bar’ erb :index end
- 34. </Short interlude regarding views>
- 35. Actions ‘/‘ Collect user data followapp.rb get ‘/‘ do erb :index end
- 36. Actions ‘/‘ Collect user data views/index.erb <h1>Enter two users</h1> <form method="get" action="/follows"> Does <input type="text" name="user1"> follow <input type="text" name="user2">? <input type="submit" value="Go"> </form>
- 37. Actions ‘/‘ Collect user data views/index.erb <h1>Enter two users</h1> <form method="get" action="/follows"> Does <input type="text" name="user1"> follow <input type="text" name="user2">? <input type="submit" value="Go"> </form>
- 38. Actions ‘/follows‘ Show following status
- 39. Actions ‘/follows‘ Show following status get '/follows' do @user1 = params[:user1] @user2 = params[:user2] #not implemented yet @following = is_following?(@user1, @user2) erb :follows end
- 40. is_following? @following = is_following?(@user1, @user2) To Implement: • Get user IDs for usernames • Check if user ID 1 is in user 2’s follower array
- 41. is_following? • Get user IDs for usernames def twitter_id(screen_name) user = open(“http://api.twitter.com/1/users/show.json?screen_name=#{screen_name}”).read user = JSON.parse(user) user['id'] end
- 42. is_following? • Get user IDs for usernames def twitter_id(screen_name) user = open(“http://api.twitter.com/1/users/show.json?screen_name=#{screen_name}”).read user = JSON.parse(user) user['id'] end twitter_id(‘a_l’) #=> 7865282
- 43. is_following? • Check if user ID 1 is in user 2’s follower array def twitter_id(screen_name) user = open(“http://api.twitter.com/1/users/show.json?screen_name=#{screen_name}”).read user = JSON.parse(user) user['id'] end def is_following?(a,b) followers = open("http://api.twitter.com/1/followers/ids.json?screen_name=#{b}").read followers = JSON.parse(followers) followers.include?(twitter_id(a)) end
- 44. is_following? • Check if user ID 1 is in user 2’s follower array def twitter_id(screen_name) user = open(“http://api.twitter.com/1/users/show.json?screen_name=#{screen_name}”).read user = JSON.parse(user) user['id'] end def is_following?(a,b) followers = open("http://api.twitter.com/1/followers/ids.json?screen_name=#{b}").read followers = JSON.parse(followers) followers.include?(twitter_id(a)) end is_following?('barackobama', 'a_l') #=> true
- 45. Putting it together def twitter_id(screen_name) user = open(“http://api.twitter.com/1/users/show.json?screen_name=#{screen_name}”).read user = JSON.parse(user) user['id'] end def is_following?(a,b) followers = open("http://api.twitter.com/1/followers/ids.json?screen_name=#{b}").read followers = JSON.parse(followers) followers.include?(twitter_id(a)) end get '/follows' do @user1 = params[:user1] @user2 = params[:user2] @following = is_following?(@user1, @user2) erb :follows end
- 46. Putting it together views/follows.erb <h2> <%= @user1 %> <%= @following ? "follows" : "does not follow" %> <%= @user2 %> </h2>
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