Ruby Rails入门 #

gem install rails
rails new myapp
cd myapp
rails server

myapp/
├── app/
│   ├── controllers/
│   ├── models/
│   ├── views/
│   └── helpers/
├── config/
│   ├── routes.rb
│   └── database.yml
├── db/
├── lib/
├── public/
└── test/

rails generate scaffold Post title:string body:text
rails db:migrate

Rails.application.routes.draw do
  resources :posts
  root "posts#index"
end

class PostsController < ApplicationController
  def index
    @posts = Post.all
  end

  def show
    @post = Post.find(params[:id])
  end
end

class Post < ApplicationRecord
  validates :title, presence: true
  validates :body, presence: true
end

<h1>Posts</h1>

<% @posts.each do |post| %>
  <h2><%= post.title %></h2>
  <p><%= post.body %></p>
<% end %>