Getting started with Rails (2), Season 2
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This document provides an overview of using scaffolding and basic CRUD functionality in Ruby on Rails. It demonstrates generating a Post resource using scaffolding, running migrations to create the database tables, using the generated controller actions and views to list, create, show, edit and delete posts. It also discusses using the console, adding validations, and connecting the application to a remote Git repository.
![Using the Console
$ rails console --sandbox
$ rails c --sandbox
Loading development environment in sandbox (Rails
3.2.6)
Any modifications you make will be rolled back on exit
1.9.3p194 :001 > Post.all
Post Load (0.1ms) SELECT "posts".* FROM "posts"
=> []
1.9.3p194 :002 > reload!
Reloading...
=> true
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-10-320.jpg)
![Listing All Posts
def index
@posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.json { render :json => @posts }
end
end
app/controllers/posts_controller.rb
1.9.3p194 :004 > posts = Post.all
Post Load (0.2ms) SELECT "posts".* FROM "posts"
=> []
1.9.3p194 :005 > posts.class
=> Array
1.9.3p194 :006 > post = Post.scoped
Post Load (0.2ms) SELECT "posts".* FROM "posts"
=> []
1.9.3p194 :007 > post.class
=> ActiveRecord::Relation
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-11-320.jpg)
![def create
@post = Post.new(params[:post])
respond_to do |format|
if @post.save
format.html { redirect_to(@post,
:notice => 'Post was successfully created.') }
format.json { render :json => @post,
:status => :created, :location => @post }
else
format.html { render :action => "new" }
format.json { render :json => @post.errors,
:status => :unprocessable_entity }
end
end
end
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-18-320.jpg)
![Show a Post
http://localhost:3000/posts/1
def show
@post = Post.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render :json => @post }
end
end
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-19-320.jpg)
![Editing Posts
def edit
@post = Post.find(params[:id])
<h1>Editing post</h1>
<%= render 'form' %> # using HTTP PUT verb
<%= link_to 'Show', @post %> |
<%= link_to 'Back', posts_path %>
app/views/posts/edit.html.erb
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-21-320.jpg)
![Editing Posts
def update
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
format.html { redirect_to(@post,
:notice => 'Post was successfully updated.') }
format.json { head :no_content }
else
format.html { render :action => "edit" }
format.json { render :json => @post.errors,
:status => :unprocessable_entity }
end
end
end
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-22-320.jpg)
![Destroying a Post
def destroy
@post = Post.find(params[:id])
@post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.json { head :no_content }
end
ROR Lab.](https://image.slidesharecdn.com/season2-02-shared-120707013421-phpapp02/85/Getting-started-with-Rails-2-Season-2-23-320.jpg)
Getting started with Rails (2), Season 2
- 1. ROR Lab. Season 2 - The 2nd Round - Getting Started with Rails (2) July 7, 2012 Hyoseong Choi ROR Lab.
- 2. A Blog Project Post ny on a m separate form nested form e to form_for to ne m an o y Comment Tag form_for fields_for ROR Lab.
- 3. Using Scaffolding $ rails generate scaffold Post name:string title:string content:text Scaffolding Generator • MVC • asset • helper • test unit • routing ROR Lab.
- 4. Creating a Resource w scaffolding $ rails g scaffold post name title content:text invoke active_record create db/migrate/20120705045702_create_posts.rb create app/models/post.rb invoke test_unit create test/unit/post_test.rb create test/fixtures/posts.yml invoke resource_route route resources :posts invoke scaffold_controller create app/controllers/posts_controller.rb invoke erb create app/views/posts create app/views/posts/index.html.erb create app/views/posts/edit.html.erb create app/views/posts/show.html.erb create app/views/posts/new.html.erb create app/views/posts/_form.html.erb invoke test_unit create test/functional/posts_controller_test.rb invoke helper create app/helpers/posts_helper.rb invoke test_unit create test/unit/helpers/posts_helper_test.rb invoke assets invoke coffee create app/assets/javascripts/posts.js.coffee invoke scss create app/assets/stylesheets/posts.css.scss invoke scss create app/assets/stylesheets/scaffolds.css.scss ROR Lab.
- 5. Running a Migration class CreatePosts < ActiveRecord::Migration def change create_table :posts do |t| t.string :name t.string :title t.text :content t.timestamps end end end db/migrate/20100207214725_create_posts.rb ROR Lab.
- 6. Running a Migration $ rake db:migrate == CreatePosts: migrating ========================================= =========== -- create_table(:posts) -> 0.0019s == CreatePosts: migrated (0.0020s) to Where? ROR Lab.
- 7. Adding a Link <h1>Hello, Rails!</h1> <%= link_to "My Blog", posts_path %> app/views/home/index.html.erb Hello, Rails! My Blog ROR Lab.
- 8. The Model class Post < ActiveRecord::Base attr_accessible :content, :name, :title end app/models/post.rb Rails Active Model Record database.yml ROR Lab.
- 9. Adding Validations class Post < ActiveRecord::Base attr_accessible :content, :name, :title validates :name, :presence => true validates :title, :presence => true, :length => { :minimum => 5 } end app/models/post.rb app/models/post.rb ROR Lab.
- 10. Using the Console $ rails console --sandbox $ rails c --sandbox Loading development environment in sandbox (Rails 3.2.6) Any modifications you make will be rolled back on exit 1.9.3p194 :001 > Post.all Post Load (0.1ms) SELECT "posts".* FROM "posts" => [] 1.9.3p194 :002 > reload! Reloading... => true ROR Lab.
- 11. Listing All Posts def index @posts = Post.all respond_to do |format| format.html # index.html.erb format.json { render :json => @posts } end end app/controllers/posts_controller.rb 1.9.3p194 :004 > posts = Post.all Post Load (0.2ms) SELECT "posts".* FROM "posts" => [] 1.9.3p194 :005 > posts.class => Array 1.9.3p194 :006 > post = Post.scoped Post Load (0.2ms) SELECT "posts".* FROM "posts" => [] 1.9.3p194 :007 > post.class => ActiveRecord::Relation ROR Lab.
- 12. <h1>Listing posts</h1> Rails makes all of the <table> instance variables from the <tr> action available to the view. <th>Name</th> <th>Title</th> <th>Content</th> <th></th> <th></th> <th></th> </tr> <% @posts.each do |post| %> <tr> <td><%= post.name %></td> <td><%= post.title %></td> <td><%= post.content %></td> <td><%= link_to 'Show', post %></td> <td><%= link_to 'Edit', edit_post_path(post) %></td> <td><%= link_to 'Destroy', post, :confirm => 'Are you sure?', :method => :delete %></td> </tr> <% end %> </table> <br /> <%= link_to 'New post', new_post_path %> app/views/posts/index.html.erb ROR Lab.
- 13. The Layout : Containers for views <!DOCTYPE html> <html> <head> <title>Blog</title> <%= stylesheet_link_tag "application" %> <%= javascript_include_tag "application" %> <%= csrf_meta_tags %> </head> <body style="background: #EEEEEE;"> <%= yield %> </body> app/views/layouts/application.html.erb ROR Lab.
- 14. Creating New Posts def new @post = Post.new respond_to do |format| format.html # new.html.erb format.json { render :json => @post } end end <h1>New post</h1> <%= render 'form' %> # using HTTP POST verb <%= link_to 'Back', posts_path %> app/views/posts/new.html.erb ROR Lab.
- 15. <%= form_for(@post) do |f| %> <% if @post.errors.any? %> <div id="errorExplanation"> <h2><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h2> <ul> <% @post.errors.full_messages.each do |msg| %> <li><%= msg %></li> <% end %> </ul> </div> <% end %> <div class="field"> <%= f.label :name %><br /> <%= f.text_field :name %> </div> <div class="field"> <%= f.label :title %><br /> <%= f.text_field :title %> </div> <div class="field"> <%= f.label :content %><br /> <%= f.text_area :content %> </div> <div class="actions"> <%= f.submit %> </div> <% end %> a “Partial” template app/views/posts/_form.html.erb ROR Lab. intelligent submit helper
- 16. ROR Lab.
- 17. “create” action ROR Lab.
- 18. def create @post = Post.new(params[:post]) respond_to do |format| if @post.save format.html { redirect_to(@post, :notice => 'Post was successfully created.') } format.json { render :json => @post, :status => :created, :location => @post } else format.html { render :action => "new" } format.json { render :json => @post.errors, :status => :unprocessable_entity } end end end ROR Lab.
- 19. Show a Post http://localhost:3000/posts/1 def show @post = Post.find(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render :json => @post } end end ROR Lab.
- 20. Show a Post app/views/posts/show.html.erb <p id="notice"><%= notice %></p> <p> <b>Name:</b> <%= @post.name %> </p> <p> <b>Title:</b> <%= @post.title %> </p> <p> <b>Content:</b> <%= @post.content %> </p> <%= link_to 'Edit', edit_post_path(@post) %> | <%= link_to 'Back', posts_path %> ROR Lab.
- 21. Editing Posts def edit @post = Post.find(params[:id]) <h1>Editing post</h1> <%= render 'form' %> # using HTTP PUT verb <%= link_to 'Show', @post %> | <%= link_to 'Back', posts_path %> app/views/posts/edit.html.erb ROR Lab.
- 22. Editing Posts def update @post = Post.find(params[:id]) respond_to do |format| if @post.update_attributes(params[:post]) format.html { redirect_to(@post, :notice => 'Post was successfully updated.') } format.json { head :no_content } else format.html { render :action => "edit" } format.json { render :json => @post.errors, :status => :unprocessable_entity } end end end ROR Lab.
- 23. Destroying a Post def destroy @post = Post.find(params[:id]) @post.destroy respond_to do |format| format.html { redirect_to posts_url } format.json { head :no_content } end ROR Lab.
- 24. Git • Linus Tobalds, 1991 • for source code version control • local repository ROR Lab.
- 25. Gitosis • Remote repository • git clone git://eagain.net/gitosis.git • git clone git://github.com/res0nat0r/ gitosis.git • Ubuntu 11.10 -> gitosis package • Ubuntu 12.04 -> not any more but gitolite ROR Lab.
- 26. Gitosis • Remote repository • git clone git://eagain.net/gitosis.git • git clone git://github.com/res0nat0r/ gitosis.git • Ubuntu 11.10 -> gitosis package • Ubuntu 12.04 -> not any more but gitolite ROR Lab.
- 27. Local Machine Git Repository Sever git@gitserver:project.git gitosis gitolite gitorious $ git add * $ git commit $ git push Origin ROR Lab.
- 28. 감사합니다.