Railsworkshop2013

Transcript

1. Rail ove Mittwoch, 9. Januar 13
2. Da 1 Mittwoch, 9. Januar 13
3. Ruby Mittwoch, 9. Januar 13
4. Vorste en Mittwoch, 9. Januar 13
5. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Wer sind wir? Max Jan Stephan Mittwoch, 9. Januar 13
6. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Wer sind wir? Railslove GmbH aus Köln - Ein junges Team aus Web-Experten - Mit Web-Entwicklungs- und Beratungsleistungen als Agentur primär in der europäischen Start-Up-Branche tätig - Zahlen und Fakten: 16+ Mitarbeiter, 300 qm offener Coworking-Space in Köln Max Jan Stephan Mittwoch, 9. Januar 13
7. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Wer seid ihr? ? Mittwoch, 9. Januar 13
8. Ablauf Mittwoch, 9. Januar 13
9. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Ablauf Wie läuft der Workshop zeitlich ab? - Start: ~10Uhr, Ende ~15-16Uhr Wie läuft der Workshop inhaltlich ab? - Abwechselnd Vortragsteile - Rundflug über die Welt von Ruby und Rails - Bei Fragen -> fragen - und Hands-On Teile - gearbeitet wird in Zweier-Gruppen - Cheat-Sheets Mittwoch, 9. Januar 13
10. Tage lanung Mittwoch, 9. Januar 13
11. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Tagesplanung Tag 1 Warm Up Ruby Grundlagen Testen in Ruby Tag 1 Rails Grundlagen Model Tag 2 Controller Views/Frontend Testing/ Javascript Mittwoch, 9. Januar 13
12. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Tagesplanung Tag 1 Warm Up Ruby Grundlagen Testen in Ruby Tag 1 Rails Grundlagen Model Tag 2 Controller Views/Frontend Testing/ Javascript Mittwoch, 9. Januar 13
13. What is Rub ? Mittwoch, 9. Januar 13
14. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Ruby: Language characteristics -Yukihiro Matsumoto “Matz” -POLS (Principle of Least Surprise) -Easy to learn -Hard to master Mittwoch, 9. Januar 13
15. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Ruby: Language characteristics -Interpreted: MRI (Matz's Ruby Interpreter) -Compiled to bytecode at runtime -Several implementations (JRuby, Rubinius, IronRuby, ...) -Potentially slow Mittwoch, 9. Januar 13
16. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Ruby: Language characteristics -"Duck typed" -Metaprogramming (code that writes code) Mittwoch, 9. Januar 13
17. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Ruby: Extensibility -Great Standard Library -Greater choice of Ruby Gems -e.g. gem install rails Mittwoch, 9. Januar 13
18. Hands-On: What is Rub ? Mittwoch, 9. Januar 13
19. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Do try this at home ruby --version # 1.9.3 irb # open interactive ruby RUBY_VERSION # "1.9.3" puts "hello world" name = "Carlos" "hello #{name}" # "hello Carlos" exit # exit interactive ruby gem --version # >= "1.8.17" Mittwoch, 9. Januar 13
20. A simple Rub a Mittwoch, 9. Januar 13
21. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 A simple Ruby class # item.rb class Item def name @name end def name=(name) @name = name end end Mittwoch, 9. Januar 13
22. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 A simple Ruby class irb require './item.rb' item = Item.new item.name = 'Bible' item.name => "Bible" Mittwoch, 9. Januar 13
23. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Essential in Ruby: Testing # item_test.rb require 'minitest/autorun' require './item.rb' class ItemTest < MiniTest::Unit::TestCase def test_name_setter_and_getter item = Item.new item.name = 'Bible' assert_equal 'Bible', item.name end end Mittwoch, 9. Januar 13
24. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Essential in Ruby: Testing ruby item_test.rb Run options: --seed 40046 # Running tests: . Finished tests in 0.000587s, 1703.5775 tests/s, 1703.5775 assertions/s. 1 tests, 1 assertions, 0 failures, 0 errors, 0 skips Mittwoch, 9. Januar 13
25. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Refactoring! # item.rb class Item attr_accessor :name end (Also available: attr_reader and attr_writer) Do your tests still pass? Mittwoch, 9. Januar 13
26. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 The initialize method Executed on every object upon initialization # item.rb class Item attr_accessor :name, :description def initialize @name = '' @description = '' end Mittwoch, 9. Januar 13
27. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Class methods Defined on the class, not each instantiated object # item.rb class Item def self.create(item_hash) item = Item.new item.name = item_hash[:name] item.description = item_hash[:description] item end end the_bible = Item.create({name: 'Bible', description: 'An old book'}) Mittwoch, 9. Januar 13
28. Hands-On: A simple Rub a Mittwoch, 9. Januar 13
29. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Hands on: Ruby classes and Testing Write an Item class and accompanying tests that do the following: - Getter and setter for title and description - title and title description value is an empty string - Advanced: - Set the rating attribute to a value between 1 and 5 - Hint: this is a Range (maybe search the Ruby docs at http://ruby- doc.org/) - Don‘t do anything if the value supplied is outside the range - Getter for the rating attribute You can write tests before or after the implementation. Mittwoch, 9. Januar 13
30. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Hands on: Ruby classes and Testing def test_name_set_to_empty_string item = Item.new assert_equal '', item.name end def test_description_set_to_empty_string item = Item.new assert_equal '', item.description end Mittwoch, 9. Januar 13
31. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Hands on: Ruby classes and Testing def test_set_rating_to_value_between_1_and_5 item = Item.new item.rating = 3 assert_equal 3, item.rating end def test_set_rating_to_value_outside_of_1_to_5 item = Item.new item.rating = 6 assert_equal nil, item.rating end def test_set_existing_rating_to_value_outside_of_1_to_5 item = Item.new item.rating = 3 item.rating = 6 assert_equal 3, item.rating end Mittwoch, 9. Januar 13
32. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Hands on: Ruby classes and Testing # item.rb class Item attr_accessor :name, :description attr_reader :rating def rating=(rating) @rating = rating if (1..5).include? rating end end Mittwoch, 9. Januar 13
33. Rub core and Std-lib Mittwoch, 9. Januar 13
34. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 String ! -modifies the receiver Common literals (How do I make one?) -'without interpolation' -"with #{interpolation}" What can you do with Strings? - Concatenate string_1 + string_2 - length - sub/sub!/gsub/gsub! - More: http://ruby-doc.org/core-1.9.3/String.html Mittwoch, 9. Januar 13
35. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Symbol (Think: String that stands for s.th.) Peculiarities: - Only instantiated once (object identity) Common literals (How do I make one?) -:my_symbol What can you do with Symbols? - Book.find(:all) - Book.find(:first) - More: http://ruby-doc.org/core-1.9.3/Symbol.html Mittwoch, 9. Januar 13
36. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Array Common literals (How do I make one?) -[1, 'text', :symbol] What can you do with Arrays? -[1,2,3] << 4 # [1, 2, 3, 4] -[1,2,3] + [4,5,6] # [1, 2, 3, 4, 5, 6] -[1,2,3].length # 3 -[4,8,7,3,7].index(7) # 2 - More: http://ruby-doc.org/core-1.9.3/Array.html Mittwoch, 9. Januar 13
37. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Hash Common literals (How do I make one?) -{:day_1 => 'Wed', :day_2 => 'Thu'} -{day_1: 'Wed', day_2: 'Thu'} What can you do with Hashes? -h[:day_1] # "Wed" -h[:day_1] = 'Superday' -h[:day_2] = {a: 'b'}; h[:day2][:a] # 'b' -h.length # 2 - More: http://www.ruby-doc.org/core-1.9.3/Hash.html Mittwoch, 9. Januar 13
38. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Regexp Common literals (How do I make one?) -/^abc/ -Regexp.new('abc/yeah') #/abc\/yeah/ What can you do with Regexps? -/abc/ =~ 'I say abc dude' # 6 -'I say hello'[/(.)ay hell(.)/, 1] # "s" -'I say hello'[/(.)ay hell(.)/, 2] # "o" - More: http://ruby-doc.org/core-1.9.3/Regexp.html Mittwoch, 9. Januar 13
39. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Control Structures if/else/unless @rating = rating if (1..5).include? rating @rating = (1..5).include? ? rating : nil @rating = rating unless invalid_rating?(rating) if (1..5).include? rating @rating = rating else puts 'supplied rating value invalid!' end Mittwoch, 9. Januar 13
40. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Control Structures Iterators - ['one', 'two', 'three'].each {|item| puts item} - ['one', 'two', 'three'].map {|item| item.upcase} - => ["ONE", "TWO", "THREE"] - {foo: 'bar', zomg: 'rofl'}.each {|k,v| puts k.to_s + v} - foobar - zomgrofl - […].each {|item| puts item} is equivalent to […].each do |item| puts item end Mittwoch, 9. Januar 13
41. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Control Structures Iterators - Also check - collect - detect - each_index - each_with_index - each_with_object - map! - select - in the Enumerable/Array/Hash classes Mittwoch, 9. Januar 13
42. Hands-On: Rub core and Std-lib Mittwoch, 9. Januar 13
43. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Creators Implement the following functionality. Make sure you cover everything with tests! - add creators: - Item#add_owner('God') # no double entries! - Item#owners # ['God', 'Markus'] - Simple Hash representation - Item#to_hash # {name: 'Bible', description: 'A really old book'} - Numbered List of similar items - Item#numbered_owners - ['1) God', '2) Markus'] Mittwoch, 9. Januar 13
44. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Authors def test_add_owner item=Item.new item.add_owner('God') assert_equal ['God'], item.owner end def test_owners_are_unique item=Item.new item.add_owner('God') item.add_c owner('God') assert_equal ['God'], item.owners end Mittwoch, 9. Januar 13
45. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Authors attr_reader :owners def add_owner(owner) @owners ||= [] unless @owners.include?(owner) @owners << owner end end Mittwoch, 9. Januar 13
46. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Simple Hash representation def test_to_hash item = Item.new item.name = 'Bible' item.description = 'An old book' expected = {name: 'Bible', description: 'An old book'} assert_equal expected, item.to_hash end def to_hash {name: name, description: description} end Mittwoch, 9. Januar 13
47. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Numbered List of authors def test_numbered_owners item = Item.new item.add_owner('Markus') item.add_owner('Johannes') expected = ['1) Markus', '2) Johannes'] assert_equal expected, item.numbered_owners end Mittwoch, 9. Januar 13
48. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Numbered List of related owners def numbered_owners owners.map do |owner| "#{@owners.index(owner) + 1}) #{owner}" end end def numbered_owners numbered = [] owners.each_with_index do |owner, index| numbered << "#{index + 1}) #{owner}" end numbered end def numbered_owner owners.map.with_index do |owner, index| "#{index+1}) #{owner}" end end Mittwoch, 9. Januar 13
49. Extendin Ruby Mittwoch, 9. Januar 13
50. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Rubygems Default solution for packaging code Ships with Ruby 1.9, installer for Ruby 1.8 Usage: - gem install rails - fetches gems from rubygems.org (central gem repository) - installs all dependencies - gem uninstall rails - uninstalls a single gem from your local repository - does not care about dependencies Mittwoch, 9. Januar 13
51. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Rubygems Using an installed gem - normally - require 'gem_name' - special cases - file to be required may derive from gem_name, e.g. require 'active_support' #gem name: activesupport - it‘s possible to require only part of a gem, e.g. require 'active_support/inflector' Mittwoch, 9. Januar 13
52. Rub code aring Mittwoch, 9. Januar 13
53. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Code sharing: Inheritance require './song' class AwesomeItem < Item attr_accessor :awesomeness end Mittwoch, 9. Januar 13
54. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Code sharing: Inheritance # awesome_item_test.rb require 'minitest/autorun' require './awesome_item.rb' class AwesomeItemTest < MiniTest::Unit::TestCase def test_parent_class assert AwesomeItem.new.is_a?(Item) end def test_class assert_instance_of AwesomeItem, AwesomeItem.new end def test_awesomeness ai = AwesomeItem.new ai.awesomeness = 'rubylicious' assert_equal 'rubylicious', ai.awesomeness end end Mittwoch, 9. Januar 13
55. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Code sharing: Mix-ins # crazyness.rb module Crazyness def crazyness 'super crazy' end end # awesome_item_test.rb class AwesomeItemTest < MiniTest::Unit::TestCase def test_crazyness ai = AwesomeItem.new assert_equal 'super crazy', ai.crazyness end end # awesome_item.rb require './crazyness' class AwesomeSong < Song include Crazyness end Mittwoch, 9. Januar 13
56. F dba Mittwoch, 9. Januar 13
57. Was für eine Ap bauen wir? Mittwoch, 9. Januar 13
58. Ruby On Rails / Starterworkshop / Railslove / 2012 What App do we build? Mittwoch, 9. Januar 13
59. Ruby On Rails / Starterworkshop / Railslove / 2012 What App do we build? Mittwoch, 9. Januar 13
60. Ruby On Rails / Starterworkshop / Railslove / 2012 What App do we build? Szenario: A lending tracker - I can add items that I borrow to friends - I wanna track which items are currently out - I can search and filter items by categories Mittwoch, 9. Januar 13
61. Brainstorming Mittwoch, 9. Januar 13
62. Ruby On Rails / Starterworkshop / Railslove / 2013 Brainstorming User Item Lending 1 n 1 n 1 n Mittwoch, 9. Januar 13
63. RubyOnRails Basics Mittwoch, 9. Januar 13
64. Ruby On Rails / Starterworkshop / Railslove / 2012 Ruby On Rails MVC Framework for webapplication - written in Ruby - Model View Controller Simplifies the development - gives you basic webapplication work flows DRY - Don´t repeat yourself Convention over configuration - just (one) configuration file REST - Ressourcenorientation and standard HTTP methods Mittwoch, 9. Januar 13
65. Ruby On Rails / Starterworkshop / Railslove / 2012 Rails and MVC Modell View Controller Status change User input Status inquiry Mittwoch, 9. Januar 13
66. Ruby On Rails / Starterworkshop / Railslove / 2012 Rails and MVC Controller View Modell Status change User input Status inquiry Mittwoch, 9. Januar 13
67. Ruby On Rails / Starterworkshop / Railslove / 2012 Modell View Controller Rails and MVC Status change User input Status inquiry Mittwoch, 9. Januar 13
68. Ruby On Rails / Starterworkshop / Railslove / 2012 Rails und MVC Modell View Controller Status change User input Status inquiry Mittwoch, 9. Januar 13
69. Ruby On Rails / Starterworkshop / Railslove / 2012 First Steps Create a new project - rails new ... Configure the database - database.yml Configure gems - gemfile Start the server - rails server Start coding - rails generate ... Mittwoch, 9. Januar 13
70. Ruby On Rails / Starterworkshop / Railslove / 2012 Bundler Bundler manages an application's dependencies through its entire life across many machines systematically and repeatably. Bundler manages your Gems and their dependencies Mittwoch, 9. Januar 13
71. Ruby On Rails / Starterworkshop / Railslove / 2012 Gemfile Mittwoch, 9. Januar 13
72. Ruby On Rails / Starterworkshop / Railslove / 2012 Database.yml Mittwoch, 9. Januar 13
73. Ruby On Rails / Starterworkshop / Railslove / 2012 Rake Rake is a simple ruby build program with capabilities similar to make Rake is a software task management tool e.g: - change your database schema - resize images - import latest currency information Task that are executed automatically and/or regular Mittwoch, 9. Januar 13
74. Ruby On Rails / Starterworkshop / Railslove / 2012 Rake common rake tasks - rake -T - rake --help - rake db:migrate - rake db:create - rake test - rake test:functional - rake my:task --trace Mittwoch, 9. Januar 13
75. Hands On Mittwoch, 9. Januar 13
76. Ruby On Rails / Starterworkshop / Railslove / 2013 Hand On Install rails - gem install rails Create your application - rails new MyCoolApplicationName Configure your app - database.yml - Gemfile - bundle install - rails server Create a scaffold - rails g scaffold item name:string - rake db:migrate Mittwoch, 9. Januar 13
77. Bringin power to your models Mittwoch, 9. Januar 13
78. Ruby On Rails / Starterworkshop / Railslove / 2012 Bringing Power to your models Migrations - Abstracts changes to your database schema Methods - class methods, instance methods and some rails magic Validation - Conditions for a valid object Tests - Be sure your code does, what it´s suppost to do Mittwoch, 9. Januar 13
79. Ruby On Rails / Starterworkshop / Railslove / 2012 Migrations Create a migration - rails generate migration NameOfTheMigration - in the db/migrate folder a migration file is created Migrationsfile - before Rails 3.1: Two methods up and down - now: one method change Using a migration - rake db:migrate Mittwoch, 9. Januar 13
80. Ruby On Rails / Starterworkshop / Railslove / 2012 Migrations Create a migration - rails generate migration NameOfTheMigration - in the db/migrate folder a migration file is created Migrationsfile - before Rails 3.1: Two methods up and down - now: one method change Using a migration - rake db:migrate Mittwoch, 9. Januar 13
81. Ruby On Rails / Starterworkshop / Railslove / 2012 Methods Instance methods Class methods Scopes Mittwoch, 9. Januar 13
82. Ruby On Rails / Starterworkshop / Railslove / 2012 Methods Instance methods Class methods Scopes Mittwoch, 9. Januar 13
83. Ruby On Rails / Starterworkshop / Railslove / 2012 Methods Instance methods Class methods Scopes Mittwoch, 9. Januar 13
84. Ruby On Rails / Starterworkshop / Railslove / 2012 Methods Instance methods Class methods Scopes scope :top_rated, where(:rating => 5) Mittwoch, 9. Januar 13
85. Ruby On Rails / Starterworkshop / Railslove / 2012 Methods for database access dynamic find and find_by methods - Item.find(1) - Item.find_by_name(„Bible“) - Item.find_all_by_tag(„Books“) Abstract database methods - Item.where(:name => „Thriller“) - Item.where(„length >= 100“) Find_by_sql - Item.find_by_sql(„SELECT * FROM ,items‘ WHERE ,name‘ = ,Bible‘“) Mittwoch, 9. Januar 13
86. Ruby On Rails / Starterworkshop / Railslove / 2012 Methods for database access dynamic find and find_by methods - Item.find(1) - Item.find_by_name(„Bible“) - Item.find_all_by_tag(„Books“) Abstract database methods - Item.where(:name => „Thriller“) - Item.where(„length >= 100“) Find_by_sql - Item.find_by_sql(„SELECT * FROM ,items‘ WHERE ,name‘ = ,Bible‘“) Mittwoch, 9. Januar 13
87. Ruby On Rails / Starterworkshop / Railslove / 2012 Validations What are validations? - Validations are rules to secure the data integrity of a object How do validations work? - Validations are checked, when you call „save“ on an object - „save“ return true or false - save! raises an execption if the validations fail - save(:validate => false) runs save without checking the validations Mittwoch, 9. Januar 13
88. Ruby On Rails / Starterworkshop / Railslove / 2012 Validations What are validations? - Validations are rules to secure the data integrity of a object How do validations work? - Validations are checked, when you call „save“ on an object - „save“ return true or false - save! raises an execption if the validations fail - save(:validate => false) runs save without checking the validations Mittwoch, 9. Januar 13
89. Ruby On Rails / Starterworkshop / Railslove / 2012 Model Tests - Test model behaviour and database integration - Located in test/unit - Inherit from ActiveSupport::TestCase Mittwoch, 9. Januar 13
90. Ruby On Rails / Starterworkshop / Railslove / 2012 Model Tests - Test model behaviour and database integration - Located in test/unit - Inherit from ActiveSupport::TestCase Mittwoch, 9. Januar 13
91. Ruby On Rails / Starterworkshop / Railslove / 2012 Fixtures: Sample data for tests - Regular Rails tests: with database integration - Useful: Test data to populate the test database - Default solution: Fixtures - YAML files located in test/fixtures - Automatic id and timestamp generation - access by model_name(:identifier_name) - cities(:cologne) Mittwoch, 9. Januar 13
92. Ruby On Rails / Starterworkshop / Railslove / 2012 Fixtures: Sample data for tests - Regular Rails tests: with database integration - Useful: Test data to populate the test database - Default solution: Fixtures - YAML files located in test/fixtures - Automatic id and timestamp generation - access by model_name(:identifier_name) - cities(:cologne) # cities.yml cologne: name: "Köln" center_lat: 50.93 center_long: 6.96 description: | Die schönste Stadt der Welt Mittwoch, 9. Januar 13
93. RSpec Schulung / DailyDeal Factories Factories sind Grundgerüste für Objekte. Cuurent Implementation: FactoryGirl - ThoughtBot Advantages: Object are only described once, can be modified to zour needs Factories are local, in one test only the relevant objects are loaded Mittwoch, 9. Januar 13
94. RSpec Schulung / DailyDeal Factories Factories sind Grundgerüste für Objekte. Cuurent Implementation: FactoryGirl - ThoughtBot Advantages: Object are only described once, can be modified to zour needs Factories are local, in one test only the relevant objects are loaded FactoryGirl.define do factory :city do name "New York" center_lat "20.34" center_long "80.872" description "Tolle Stadt" end end Mittwoch, 9. Januar 13
95. RSpec Schulung / DailyDeal Factories Factories sind Grundgerüste für Objekte. Cuurent Implementation: FactoryGirl - ThoughtBot Advantages: Object are only described once, can be modified to zour needs Factories are local, in one test only the relevant objects are loaded FactoryGirl.define do factory :city do name "New York" center_lat "20.34" center_long "80.872" description "Tolle Stadt" end end FactoryGirl.create(:city, name: "Köln", center_lat: 50.93, center_long: 6.96) Mittwoch, 9. Januar 13
96. Ruby On Rails / Starterworkshop / Railslove / 2013 Hand On Useful methods for items - transfer useful methods from this morning to your item model - add useful scopes Migrations - add more attributes to your item model Validations - Create conditions for valid item objects Tests - Test validations and methods Mittwoch, 9. Januar 13
97. A ociations Mittwoch, 9. Januar 13
98. Ruby On Rails / Starterworkshop / Railslove / 2012 Association What are association? - they describe the relationship between two models - on a database level: Connecting two tables Which kinds if association exist? - has_one - belongs_to - has_many - has_and_belongs_to_many Mittwoch, 9. Januar 13
99. Ruby On Rails / Starterworkshop / Railslove / 2012 Association has_one: - 1:1 relation on an object level - The songmodel is extended with a mp3 method - takes care of the foreign key relation songs id title duration 1 1 mp3s id title song_id Mittwoch, 9. Januar 13
100. Ruby On Rails / Starterworkshop / Railslove / 2012 Association has_many: - 1:n relation on object level - The artist model is extended with a songs method - In sql: Select * from songs where artist.id = songs.artist_id artist id firstname lastname 1 n songs id title duration artist_id Mittwoch, 9. Januar 13
101. Ruby On Rails / Starterworkshop / Railslove / 2012 Association belongs_to: - Describes the foreign key class in a 1:1 or 1:n relation - The song model is extended with a artist method artist id firstname lastname 1 n songs id title duration artist_id Mittwoch, 9. Januar 13
102. Ruby On Rails / Starterworkshop / Railslove / 2012 Association has_and_belongs_to_many: - represents a n:m relation - a join table is needed - No ActiveRecord::Base Class is needed - convention: tablenames in alphabetical order with a underscore 1 n songs id title duration artist_id labels id name country city labels_songs label_id song_id 1 n Mittwoch, 9. Januar 13
103. Hands On Mittwoch, 9. Januar 13
104. Ruby On Rails / Starterworkshop / Railslove / 2013 Hand On New models (rails g model) - create an user and a lending model Association - Create relations between users, items and lendings - migrate the database with needed fields Validations Methods Tests Mittwoch, 9. Januar 13
105. S you tomo ow -> 10:00Uhr Mittwoch, 9. Januar 13
106. Da 2 Mittwoch, 9. Januar 13
107. F dba Ta 1 Mittwoch, 9. Januar 13
108. Contro er Mittwoch, 9. Januar 13
109. Ruby On Rails / Starterworkshop / Railslove / 2012 Controller What are Controller? - Orgistrates the application - Connects models and views - Every controller class inherties from ApplicationController - Methods (actions)are mapped through name and HTTP method Basic actions: - new/create => Create a new object - edit/update => Edit a existing object - show => view a specific object - index => view a list of objects from a specific model - delete => delete a specific object Mittwoch, 9. Januar 13
110. Ruby On Rails / Starterworkshop / Railslove / 2012 Controller actions Result of a controller action - render: passes variables to a view - without a explizit render command rails renders the view that matches the action name - you can force a render explicitly : render „new“ - Redirect: Move to another action - redirect_to :back - redirect_to :action => „index“ - redirect_to items_path Mittwoch, 9. Januar 13
111. Ruby On Rails / Starterworkshop / Railslove / 2012 Routing Mittwoch, 9. Januar 13
112. Ruby On Rails / Starterworkshop / Railslove / 2012 Routing The first part identifies the host Mittwoch, 9. Januar 13
113. Ruby On Rails / Starterworkshop / Railslove / 2012 Routing The first part identifies the host The second part selects the controller BookingsController Mittwoch, 9. Januar 13
114. Ruby On Rails / Starterworkshop / Railslove / 2012 Routing The first part identifies the host The second part selects the controller BookingsController The third part picks the action Mittwoch, 9. Januar 13
115. Ruby On Rails / Starterworkshop / Railslove / 2012 Routing What I need to know? rake routes internal rails representation of a url like: locations_beer_index_url http method path (url without host) corresponding controller and action Mittwoch, 9. Januar 13
116. Ruby On Rails / Starterworkshop / Railslove / 2012 What I need to know? 4 HTTP most used Methods - PUT, POST, DELETE, GET CRUD - means: Create (POST/CREATE), Read (GET/SELECT), Update (PUT/ UPDATE), Delete (DELETE/DELETE) Try to do it RESTful - Use these HTTP methods and the CRUD-Pattern to keep your controllers clean Routing Mittwoch, 9. Januar 13
117. Ruby On Rails / Starterworkshop / Railslove / 2012 MyApp/config/routes.rb Basic Routing Gives us - GET, POST, PUT, DELETE methods for our Profile resource - and a ‘http://oktoberfest.com/’ URL - matches pages#landing_page - make sure you delete public/index.html !!! Routing Mittwoch, 9. Januar 13
118. Ruby On Rails / Starterworkshop / Railslove / 2012 MyApp/config/routes.rb Optional Parameters Routing Mittwoch, 9. Januar 13
119. Ruby On Rails / Starterworkshop / Railslove / 2012 MyApp/config/routes.rb Nested Routes Routing Mittwoch, 9. Januar 13
120. Hands On Mittwoch, 9. Januar 13
121. Ruby On Rails / Starterworkshop / Railslove / 2013 Hand On Create a location controller - rails g resource lending Clean up controller - remove unused actions from existing controllers - think about more actions you could need to have a better workflow Routes.rb - adapt routes.rb to your new action methods Mittwoch, 9. Januar 13
122. Da 's s edule Mittwoch, 9. Januar 13
123. Ruby On Rails / Starterworkshop / Railslove / 2012 Day's schedule Day 1 Ruby Basics Testing in Ruby Rails Basics Model Controller Day 2 Controller Views Frontend Testing Javascript Mittwoch, 9. Januar 13
124. Ruby On Rails / Starterworkshop / Railslove / 2012 Day's schedule Day 1 Ruby Basics Testing in Ruby Rails Basics Model Controller Day 2 Controller Views Frontend Testing Javascript Mittwoch, 9. Januar 13
125. Haml & Sa Mittwoch, 9. Januar 13
126. Ruby On Rails / Starterworkshop / Railslove / 2012 Haml What is Haml? - HTML Abstraction Markup Language Principles: - Markup should be beautiful - Markup should be DRY - Markup should be well-indented Mittwoch, 9. Januar 13
127. Ruby On Rails / Starterworkshop / Railslove / 2012 Showdown HTML Mittwoch, 9. Januar 13
128. Ruby On Rails / Starterworkshop / Railslove / 2012 Showdown HTML Haml Mittwoch, 9. Januar 13
129. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass What is Sass? - Syntactically Awesome Stylesheets - Standard language for css coding since rails 3.1 functionality: - Nesting - Variables - Selector Inheritance - Mixins Mittwoch, 9. Januar 13
130. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass: Nesting Mittwoch, 9. Januar 13
131. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass: Variables Mittwoch, 9. Januar 13
132. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass: Selector Inheritance Mittwoch, 9. Januar 13
133. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass: Mixins Mittwoch, 9. Januar 13
134. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass: Alternative Syntax What is Scss? - new, alternative syntax for Sass - per definition: valid CSS is valid SCSS functinality: - Closer to css - same functionality then Sass Mittwoch, 9. Januar 13
135. Ruby On Rails / Starterworkshop / Railslove / 2012 Sass: Alternative Syntax What is Scss? - new, alternative syntax for Sass - per definition: valid CSS is valid SCSS functinality: - Closer to css - same functionality then Sass Mittwoch, 9. Januar 13
136. Views Mittwoch, 9. Januar 13
137. Ruby On Rails / Starterworkshop / Railslove / 2012 Views What are views doing? - generate the user interface - present database values What are views located? - every controller has its own folder: app/views/controller_name - every action has a view template: app/views/controller_name/ action_name - layouts folder for static content like header, footer,... How does a view look? Mittwoch, 9. Januar 13
138. Ruby On Rails / Starterworkshop / Railslove / 2012 Views What are views doing? - generate the user interface - present database values What are views located? - every controller has its own folder: app/views/controller_name - every action has a view template: app/views/controller_name/ action_name - layouts folder for static content like header, footer,... How does a view look? Mittwoch, 9. Januar 13
139. Ruby On Rails / Starterworkshop / Railslove / 2012 Layouts What are layouts? - templates that render generall stuff (footer, header, sidebar,...) - can include a =yield Which layout is rendered? - default: app/views/layouts/controller_name - otherwise app/views/layouts/application - you can specify a layout in the render method: render ,action‘, :layout => „layout“ - you can define a layout per controller: layout ,special_layout‘ Mittwoch, 9. Januar 13
140. Ruby On Rails / Starterworkshop / Railslove / 2012 Layouts What are layouts? - templates that render generall stuff (footer, header, sidebar,...) - can include a =yield Which layout is rendered? - default: app/views/layouts/controller_name - otherwise app/views/layouts/application - you can specify a layout in the render method: render ,action‘, :layout => „layout“ - you can define a layout per controller: layout ,special_layout‘ Mittwoch, 9. Januar 13
141. Ruby On Rails / Starterworkshop / Railslove / 2012 Partials What are partials? - partials are templates, which render a reuable part of a page (lists,galleries, ...) - they keep your code dry - The name of a partial file always starts with a underscore Rendern of partials - render :partial => „folder/_partialname“ - instance variables are usable - you can paste custom variables - :object => variable (variable name = partial name) - :locals => {:variablenname => variable} Mittwoch, 9. Januar 13
142. Ruby On Rails / Starterworkshop / Railslove / 2012 Partials What are partials? - partials are templates, which render a reuable part of a page (lists,galleries, ...) - they keep your code dry - The name of a partial file always starts with a underscore Rendern of partials - render :partial => „folder/_partialname“ - instance variables are usable - you can paste custom variables - :object => variable (variable name = partial name) - :locals => {:variablenname => variable} Mittwoch, 9. Januar 13
143. Ruby On Rails / Starterworkshop / Railslove / 2012 Helpers What are helpers? - methods you can use in your views - reduces logic in your views - Every controller has a matching helper: app/helpers/ controller_name_helper.rb Standard-Helper? - e.g. for text - truncate - pluralize - e.g. to generate links - link_to - url_for Mittwoch, 9. Januar 13
144. Ruby On Rails / Starterworkshop / Railslove / 2012 Helpers What are helpers? - methods you can use in your views - reduces logic in your views - Every controller has a matching helper: app/helpers/ controller_name_helper.rb Standard-Helper? - e.g. for text - truncate - pluralize - e.g. to generate links - link_to - url_for Mittwoch, 9. Januar 13
145. A et Pipeline Mittwoch, 9. Januar 13
146. Ruby On Rails / Starterworkshop / Railslove / 2012 Asset Pipeline What is the asset pipeline? - The asset pipeline provides a framework to concatenate and minify or compress JavaScript and CSS assets. It also adds the ability to write these assets in other languages such as CoffeeScript, Sass and Haml. Whats the benefit? - don´t care about assets, just use them - best example: images - rake assets:precompile. Mittwoch, 9. Januar 13
147. Ruby On Rails / Starterworkshop / Railslove / 2012 Asset Pipeline What is the asset pipeline? - The asset pipeline provides a framework to concatenate and minify or compress JavaScript and CSS assets. It also adds the ability to write these assets in other languages such as CoffeeScript, Sass and Haml. Whats the benefit? - don´t care about assets, just use them - best example: images - rake assets:precompile. Mittwoch, 9. Januar 13
148. Hands On Mittwoch, 9. Januar 13
149. Ruby On Rails / Starterworkshop / Railslove / 2013 Hand On Convert your appliation.html.erb to Haml Add a header with navigation and a fancy logo - also done in the application.html.haml Create a view to create a new lending Mittwoch, 9. Januar 13
150. Coff script Mittwoch, 9. Januar 13
151. Ruby On Rails / Starterworkshop / Railslove / 2012 Coffeescript What is Coffeescript? - Language that compiles into javascript - ruby inspired syntax - Standard language for javascript coding since rails 3.1 What makes coffeescript better then pure javascript?: - Less LOC (~30%) - Better readable code - Ruby style funtionalities - “a text with a #{variable} in the middle“ - unless - ... Mittwoch, 9. Januar 13
152. Ruby On Rails / Starterworkshop / Railslove / 2012 Coffeescript Mittwoch, 9. Januar 13
153. Ruby On Rails / Starterworkshop / Railslove / 2012 Coffeescript variable Mittwoch, 9. Januar 13
154. Ruby On Rails / Starterworkshop / Railslove / 2012 Coffeescript variable function Mittwoch, 9. Januar 13
155. Ruby On Rails / Starterworkshop / Railslove / 2012 Coffeescript Mittwoch, 9. Januar 13
156. Intera in live with an a Mittwoch, 9. Januar 13
157. Ruby On Rails / Starterworkshop / Railslove / 2012 Acts like an api How do I get data to use it via a ajax on a view - render: create a full response to send back to the browser - redirect_to: send an HTTP redirect status code to the browser (e.g.: 301) - head: create a response consisting solely of HTTP headers to send back to the browser Mittwoch, 9. Januar 13
158. Hands On Mittwoch, 9. Januar 13
159. Ruby On Rails / Starterworkshop / Railslove / 2013 Hand On Enhance your dashboard with a live search - Be able to search for a item - new action - Return the item list as json - return of that action - filter items in the dashboard - only display items that match Mittwoch, 9. Januar 13
160. Heroku Mittwoch, 9. Januar 13
161. Ruby On Rails / Starterworkshop / Railslove / 2012 Heroku Heroku is a simple hoster for your app - cloud application plattform based on amazon - deploy ruby, node, cloujure, java, python and scala - just push your app to heroko - gemfile: gem ‘heroku’ && bundle install Mittwoch, 9. Januar 13
162. Ruby On Rails / Starterworkshop / Railslove / 2012 Heroku Heroku is a simple hoster for your app - cloud application plattform based on amazon - deploy ruby, node, cloujure, java, python and scala - just push your app to heroko - gemfile: gem ‘heroku’ && bundle install Mittwoch, 9. Januar 13
163. ank you! Mittwoch, 9. Januar 13
164. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Your lessions learned - Ruby is fun! - Rails helps you to get a running web app pretty fast - Modell, View, Controller to structure a app - Testing is important! - Haml, Sass, Coffeescript > Html, Css, Javascript Mittwoch, 9. Januar 13
165. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Our lessions learned - Your opinion? Mittwoch, 9. Januar 13
166. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Challenge Task - visit api.railslove.com - build an app (Rails, Sinatra, ...) that contains - a jobs/new view with needed attributes for a job application and display the job description - a jobs/create method that sends the job application via a POST request to api.railslove.com Mittwoch, 9. Januar 13
167. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Challange Show it to us - deploy it on heroku - send us a jobposting using your app and tell us where it is on github - first “coolest”, “smartest” and “sophisticated” solution wins a 50 euro amazon voucher and maybe more Mittwoch, 9. Januar 13
168. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Challange Minimum fields - Subject => Ruby on Rails from Scratch - resumee => What did you think of the workshop - heroku_url => For us to check your app out - github_user_name Mittwoch, 9. Januar 13
169. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Resources Links - http://ruby-doc.org/ - http://rubygems.org/ - http://www.ruby-toolbox.com/ - http://api.rubyonrails.org/ Railslove - Campfire - User Groups (ruby, js, devHouse Friday, ...) - Cowoco Mittwoch, 9. Januar 13
170. Ruby On Rails / Einsteigerworkshop / Railslove / 2012 Feedback? Mittwoch, 9. Januar 13