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skalnik/demo.rb

Created February 21, 2012 14:35
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Rails Workshop
Raw
demo.rb
class Demo
def initialize(&block)
instance_eval &block
end
def wait_for_enter
puts "Press enter to continue"
gets
end
def keynote
puts "Keynote!"
wait_for_enter
end
def run(cmd)
puts "$ #{cmd}"
puts `#{cmd}`
wait_for_enter
end
def echo_run(to_print, to_run)
puts "$ #{to_print}"
puts `#{to_run}`
wait_for_enter
end
def open(file)
puts "Check out #{file}"
`open #{file}`
wait_for_enter
end
def update(file, args)
if content = args[:with]
puts "updating #{file} with:"
puts content
File.delete(file)
File.open(file, 'w') do |file|
file.write content
end
else
raise ArguementError, 'Expecting with argument'
end
wait_for_enter
end
def write(file, args)
if content = args[:with]
puts "writing #{file} with:"
puts content
File.open(file, 'w') do |file|
file.write content
end
else
raise ArguementError, 'Expecting with argument'
end
wait_for_enter
end
def self.finish_up
puts "All done!"
wait_for_ener
clean_up
end
def self.clean_up
puts "Cleaning up!"
`rm -rf blog`
end
at_exit { `cd ..`; finish_up }
end
Raw
script.rb
#!/usr/bin/env ruby
require_relative 'demo'
Demo.new do
puts "Install Rails"
puts "Latest version is 3.2.1"
run "gem install rails"
puts "Generate app named blog"
run "rails new blog"
puts "That made bunch of files"
puts "The Rails skeleton"
puts "It also installed dependencies"
Dir.chdir "blog"
puts "We actually have a running app"
echo_run('rails server', 'rails server -d')
open 'http://0.0.0.0:3000'
puts "Lets generate a model named post"
puts "Has a string as title and text as body"
run "rails generate model Post title:string body:text"
open 'app/models/post.rb'
puts "It's empty!? Dynamic from table!"
open 'db/migrate/*create_posts.rb'
puts "Title, check"
puts "Body, check"
puts "Timestamps? Automatic!"
puts "So what's a model do for us?"
keynote
puts "Lets setup our database and run migrations"
run "rake db:migrate"
puts "rails console"
puts <<-CONSOLE
>> # Persistence:
>> first_post = Post.new(:title => 'First post!', :body => \"Welcome to my new blog!\nI hope you enjoy your stay!\")
>> first_post.new_record?
>> first_post.save
>> Post.count
>> first_post.new_record?
>> first_post.body = 'New post body!'
>> first_post.save
>> # Database Access:
>> Post.find(1)
>> Post.first
>> Post.all
>> # Behavior:
>> class Post
>> def to_newspaper_format
>> \"\#{title}\n\#{created_at}\n\n\#{body}\"
>> end
>> end
>> puts first_post.to_newspaper_format
CONSOLE
wait_for_enter
# Generate controller with all our actions
run "rails generate controller Posts index show edit update new create destroy"
puts "What's a controller do for us?"
keynote
posts_controller = <<-CODE
class PostsController < ApplicationController
def index
@posts = Post.all
end
def new
@post = Post.new
end
def create
@post = Post.new(params[:post])
if @post.save
redirect_to @post
else
render :action => 'new'
end
end
def show
@post = Post.find(params[:id])
end
def edit
@post = Post.find(params[:id])
end
def update
@post = Post.find(params[:id])
if @post.update_attributes(params[:post])
redirect_to @post
else
render :action => 'edit'
end
end
def destroy
@post = Post.find(params[:id])
@post.destroy
redirect_to posts_url
end
end
CODE
update 'app/controllers/posts_controller.rb', with: posts_controller
puts "What about the views?"
keynote
posts_index = <<-CODE
<h1>Posts</h1>
<p>
<%= link_to 'New Post', new_post_path %>
</p>
<% @posts.each do |post| %>
<h3><%= post.title %></h3>
<p class="date"><%= post.created_at %></p>
<p><%= post.body %></p>
<p><%= link_to 'Edit', edit_post_path(post) %></p>
<% end %>
CODE
update 'app/views/posts/index.html.erb', with: posts_index
puts "We want RESTful routes"
routes = <<-CODE
Blog::Application.routes.draw do
resources :posts
root :to => "posts#index"
end
CODE
update 'config/routes.rb', with: routes
run "rm public/index.html"
posts_new = <<-CODE
<h1>Create Post</h1>
<%= form_for @post do |f| %>
<p>
<%= f.label :title %> <br/>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :body %><br/>
<%= f.text_area :body %>
</p>
<%= f.submit %>
<% end %>
CODE
update 'app/views/posts/new.html.erb', with: posts_new
posts_edit = <<-CODE
<h1>Editing Post</h1>
<%= render 'form', { post: @post } %>
CODE
update 'app/views/posts/edit.html.erb', with: posts_edit
posts_form_partial = <<-CODE
<%= form_for post do |f| %>
<p>
<%= f.label :title %> <br/>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :body %><br/>
<%= f.text_area :body %>
</p>
<%= f.submit %>
<% end %>
CODE
write 'app/views/posts/_form.html.erb', with: posts_form_partial
posts_new = <<-CODE
<h1>Create Post</h1>
<%= render 'form', { post: @post } %>
CODE
update 'app/views/posts/new.html.erb', with: posts_new
puts "Cool! We have some posts now. Lets add comments"
run "rails generate model Comment name:string body:text post:references"
run "rails generate controller Comments create destroy"
open 'app/models/comment.rb'
open 'db/migrate/*create_comments.rb'
puts "And run migrations"
run "rake db:migrate"
post_model = <<-CODE
class Post < ActiveRecord::Base
has_many :comments
end
CODE
update 'app/models/post.rb', with: post_model
routes = <<-CODE
Blog::Application.routes.draw do
resources :posts do
resources :comments
end
end
CODE
update 'config/routes.rb', with: routes
comments_controller = <<-CODE
class CommentsController < ApplicationController
def create
@post = Post.find(params[:post_id])
@comment = @post.comments.create(params[:comment])
redirect_to post_url(@post)
end
def destroy
@post = Post.find(params[:post_id])
@comment = @post.comments.find(params[:id])
@comment.destroy
redirect_to post_url(@post)
end
end
CODE
update 'app/controllers/comments_controller.rb', with: comments_controller
posts_show = <<-CODE
<h1><%= @post.title %></h1>
<p><%= @post.created_at %></p>
<p><%= @post.body %></p>
<br/>
<% @post.comments.each do |comment| %>
<p>
Commenter: <%= comment.name %>
</p>
<p>
<%= comment.body %>
</p>
<p>
<%= link_to 'Delete', [comment.post, comment], :confirm => 'Are you sure?',
:method => :delete %>
</p>
<% end %>
<br/>
<%= form_for [@post, @post.comments.build] do |f| %>
<p>
<%= f.label :name %> <br/>
<%= f.text_field :name %>
</p>
<p>
<%= f.label :comment %><br/>
<%= f.text_area :comment %>
</p>
<%= f.submit %>
<% end %>
<p>
<%= link_to 'Posts', posts_path %>,
<%= link_to 'New Post', new_post_path %>
</p>
CODE
update 'app/views/posts/show.html.erb', with: posts_show
end
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