初探Rails投影片

01
Rails
02 Ruby
03
04 Git Repo
05
06 Migration
07 Rails
08 CRUD Scaffolding
09
10 Topic
11 Topics
12
13 Topic Topics
14 Topic
15 Topics
16 Deploy Heroku

01
02 Ruby
03
04 Git Repo
Rails
05
06 Migration
07 Rails
08 CRUD Scaffolding
09
10 Topic
11 Topics
12
13 Topic Topics
14 Topic
15 Topics
16 Deploy Heroku

(variables)
1+2 => 3
3*4 => 12
puts a+1 4
=> nil
(
)
a=3 => 3

(array)
” ”
a = [1,3,5] # a [1,3,5]
a = a + [6] #a [1,3,5,6]
a = a - [1] #a [3,5,6]
fruits = ["kiwi", "strawberry", "plum"]
# fruits ["kiwi", "strawberry", "plum"]
fruits = fruits + ["orange"]
#fruits ["kiwi", "strawberry", "plum", "orange"]
fruits = fruits - ["kiwi"]
#fruits ["strawberry", "plum", "orange"]

(class)
7.class => Fixnum
"kiwi".class => String
Ruby
fruits.class => Array

(loop)
1~10
i = 1
while i<=10
puts i
i = i + 1
end
1~10 1~100 1~1000

(loop)
a=[1,3,5]
a.each do |x|
puts x
end

(flow control)
if
else
end
if my_variable > 1
puts "YAY!"
end

(method)
( )
( )
def pluralize(word)
word + "s"
end
pluralize("kiwi")
def ( )
end

intro_rails/0416
rails new suggestotron rails
suggestotron

finder
app
config config configuration
route db

Git git init
suggestotron git init
suggestotron
Step 1: suggestotron
Step 2: git init
Git Repo

git
git add
git add . .
Step 1: git add .
Git Repo

Git Repo
git commit
git commit -m “ ”
Step 1: git commit -m “ ”

rails server
Step 1: rails server rails s

1 rails server
2 Ctrl + C
3 (tab)
4 > rails server -p 4000
localhost:4000

Migration
(topic)
Face
as title

Migration
1. (title) (description)
2.
Rails Scaffold( )

rails generate scaffold topic title:string
description:text 2 1. (topic)
(title) (description) 2.
scaffold (script)
db/migrate/XXXX_create_topics.rb
rake db:migrate
Step 1: rails generate scaffold topic title:string description:text 
< ....>
Step 2: rake db:migrate
Migration-Scaffold

Step 1: rails generate scaffold topic title:string
description:text
Migration-Scaffold

Migration-Scaffold

http://localhost:3000/topics
~

( )
Rails
(Create) (Read) (Update)
(Delete) CRUD
Migration

( )
rails scaffold( )
schema CRUD
rails generate scaffold topic title:string
description:text
CRUD
migration
rake db:migrate
Migration

MVC (model view controller)
controller
model
view
Rails
Controller
ViewModel

rails server
http://localhost:3000/topics
CRUD Scaffolding

localhost:3000
localhost:3000/topics
localhost:3000
route ( ) route

Step 1: localhost:3000/rails/info
< >/topics topics#index

/topics
Step 1: /config/routes.rb
• (#)
• root
• welcome#index welcome index

topics index
Step 2: # root ‘welcome#index’
root ‘topics#index’

Topic
table( ) vote
1 vote 1
vote ( schema)
id 1 vote
topic_id id

Topic
Step 1: rails generate model vote topic_id:integer

Topics
Topic model Vote
Step 1: app/models/topic.rb

Topics
topic have many Topic
model has_many :votes
dependent: :destroy Topic destroy
votes
class Topic < ActiveRecord::Base
has_many :votes, dependent: :destroy
end
Step 2: app/models/topic.rb

Topics
Vote model Topic
Step 1: app/models/vote.rb
class Vote < ActiveRecord::Base
belongs_to :topic
end
topic Vote model
belongs_to :topic

(+1)
(topic)
+1
Face 3
5
as title 7

3
A. (Controller)
B. (Route)
C. (View)

A.
Step 1: app/controllers/topics_controller.rb
controller private keyword
def upvote
@topic = Topic.find(params[:id])
@topic.votes.create
redirect_to(topics_path)
end

A.
1. def upvote
2. @topic = Topic.find(params[:id])
3. @topic.votes.create
4. redirect_to(topics_path)
5. end
1~5 upvote ( )
2 params[:id] topic id
@topic
3 @topic vote
4

B.
Router
router Controller
Step 1: http://localhost:3000/rails/info route

B.
Step 2: config/routes.rb
resources :topics
resources :topics do
member do
post 'upvote'
end
end

B.
Step 3: http://localhost:3000/rails/info route
Route

C.
Step 1: app/views/topics/index.html.erb
<% @topics.each do |topic| %>
<tr>
<td><%= topic.title %></td>
<td><%= topic.description %></td>
<td><%= link_to 'Show', topic %></td>
<td><%= link_to 'Edit', edit_topic_path(topic) %></td>
<td><%= link_to 'Destroy', topic, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
<% @topics.each do |topic| %>
<tr>
<td><%= topic.votes.count %></td>
<td><%= button_to ' ', upvote_topic_path(topic), method: :post %></td>
<td><%= link_to 'Destroy', topic, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
( 2 )

Topic Topics
( )
Q
A Controller create update

Topic Topics
Step 1: app/controllers/topics_controller.rb create

Topic Topics
save @topic
Step 2: @topic topics_path

Topic Topics
Step 3: create update

Topic
View
Step 1: app/views/topics/index.html.erb
<th>Description</th>

Topic
Step 2 app/views/topics/
index.html.erb
<td><%= link_to topic.title, topic %></td>

Topics
'show'
'edit'
'destroy' 'delete'

Topics
Step 1 : app/views/topics/index.html.erb
Step 2 : app/views/topics/index.html.erb
<td><%= link_to 'Destroy', topic, method: :delete,  
data: { confirm: 'Are you sure?' } %></td>
<td><%= link_to 'Delete', topic, method: :delete,  
data: { confirm: 'Are you sure?' } %></td>

Heroku
Heroku Heroku
2007 6 Ruby
Java Node.js Scala Clojure Python
PHP Perl

Deploy Heroku
1. Heroku Heroku toolbelt SSH key
heroku ( )
2. heroku

Step 1: Heroku http://heroku.com (
Heroku Git GitHub SSH Email )
Step 2: https://toolbelt.heroku.com/ heroku
toolbelt

Step 3: heroku version heroku-toolbelt
3.42.50( )

SSH key Heroku
Step 4 : heroku keys:add

Deploy Heroku
heroku heroku
Step 1: heroku create
heroku create Heroku
URL

Deploy Heroku
Step 2 : Gemfile
gem 'sqlite3'
group :development, :test do
gem 'sqlite3'
end
group :production do
gem 'pg'
gem 'rails_12factor'
end

Deploy Heroku
Step 3 bundle install --without production

Deploy Heroku
heroku git
commit
Step 4 :
git add .
git commit -m “deploy to heroku”

Deploy Heroku
heroku
Step 5 : git push heroku master
heroku migration
Step 6 heroku run rake db:migrate

Deploy Heroku
Step 7 heroku open

初探Rails投影片

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