Ruby on Rails 的快速學習的體系框架；

參考案例體系：

https://ruby-china.github.io/rails-guides/getting_started.html

https://www.techotopia.com/index.php/Ruby_Essentials

https://rails.guide/

Ruby on Rails 程式設計體系的技能體系的學習的關鍵所在在於：

新手階段 10% ；

1、Ruby 的後端結構的體系的學習；

2、Rails 的前端框架的體系的學習；

3、Ruby on Rails 的案例體系的訓練 ；

高階新手階段 59% ；

4、針對於存在的案例給與專案的復現；

勝任者 20% ；精通者階段 10% ；

5、針對於不存在的案例使用皮膚完成專案分解，從而打造自己的專案；

專家階段 1% ；

6、針對於別人的專案的問題，快速的給與解決的方法和答疑

新建一個專欄

rails new blog
cd blog
git init
git add .
git commit -m "commit initial"

構建一個首頁

bin/rails generate controller Welcome index
atom .
rails s

touch app/views/welcome/index.html.erb

<h1>Hello, Rails!</h1>

config/routes.rb

Rails.application.routes.draw do
  root 'articles#index'
  resources :articles
end

構建文章列表

git checkout -b add_articles
bin/rails generate controller Articles
bin/rails generate model Article title:string text:text
bin/rails db:migrate
rails s
git add .
git commit -m "add articles"

app/controllers/articles_controller.rb

class ArticlesController < ApplicationController
  def index
    @articles = Article.all
  end

  def show
    @article = Article.find(params[:id])
  end

  def new
    @article = Article.new
  end

  def edit
    @article = Article.find(params[:id])
  end

  def create
    @article = Article.new(article_params)

    if @article.save
      redirect_to @article
    else
      render 'new'
    end
  end

  def update
    @article = Article.find(params[:id])

    if @article.update(article_params)
      redirect_to @article
    else
      render 'edit'
    end
  end

  def destroy
    @article = Article.find(params[:id])
    @article.destroy

    redirect_to articles_path
  end

  private
    def article_params
      params.require(:article).permit(:title, :text)
    end
end

touch app/views/articles/index.html.erb

<h1>Hello, Rails!</h1>
<%= link_to 'My Blog', controller: 'articles' %>

<h1>Listing Articles</h1>
<%= link_to 'New article', new_article_path %>
<table>
  <tr>
    <th>Title</th>
    <th>Text</th>
    <th colspan="3"></th>
  </tr>

  <% @articles.each do |article| %>
    <tr>
      <td><%= article.title %></td>
      <td><%= article.text %></td>
      <td><%= link_to 'Show', article_path(article) %></td>
      <td><%= link_to 'Edit', edit_article_path(article) %></td>
      <td><%= link_to 'Destroy', article_path(article),
              method: :delete,
              data: { confirm: 'Are you sure?' } %></td>
    </tr>
  <% end %>
</table>

app/views/articles/-form.html.erb

<%= form_for @article do |f| %>

  <% if @article.errors.any? %>
    <div id="error_explanation">
      <h2>
        <%= pluralize(@article.errors.count, "error") %> prohibited
        this article from being saved:
      </h2>
      <ul>
        <% @article.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
  </p>

  <p>
    <%= f.label :text %><br>
    <%= f.text_area :text %>
  </p>

  <p>
    <%= f.submit %>
  </p>

<% end %>

app/views/articles/show.html.erb

<p>
  <strong>Title:</strong>
  <%= @article.title %>
</p>

<p>
  <strong>Text:</strong>
  <%= @article.text %>
</p>

<h2>Comments</h2>
<%= render @article.comments %>

<h2>Add a comment:</h2>
<%= render 'comments/form' %>

<%= link_to 'Edit', edit_article_path(@article) %> |
<%= link_to 'Back', articles_path %>

app/views/articles/new.html.erb

<h1>New article</h1>

<%= render 'form' %>

<%= link_to 'Back', articles_path %>

app/views/articles/edit.html.erb

<h1>Edit article</h1>

<%= render 'form' %>

<%= link_to 'Back', articles_path %>

構建評論頁面

git checkout -b add_comments
bin/rails generate model Comment commenter:string body:text article:references
bin/rails db:migrate
bin/rails generate controller Comments
rails s

config/routes.rb

Rails.application.routes.draw do
  root 'articles#index'
  resources :articles do
  resources :comments
 end
end

app/models/article.rb

class Article < ApplicationRecord
  has_many :comments, dependent: :destroy
  validates :title, presence: true,
                      length: { minimum: 5 }

                    end

app/models/comment.rb

class Comment < ApplicationRecord
  belongs_to :article
end

app/controllers/comments_controller.rb

class CommentsController < ApplicationController
  def create
    @article = Article.find(params[:article_id])
    @comment = @article.comments.create(comment_params)
    redirect_to article_path(@article)
  end

  def destroy
     @article = Article.find(params[:article_id])
     @comment = @article.comments.find(params[:id])
     @comment.destroy
     redirect_to article_path(@article)
   end

  private
    def comment_params
      params.require(:comment).permit(:commenter, :body)
    end
end

app/views/comments/-comment.html.erb

<p>
  <strong>Commenter:</strong>
  <%= comment.commenter %>
</p>

<p>
  <strong>Comment:</strong>
  <%= comment.body %>
</p>

<p>
  <%= link_to 'Destroy Comment', [comment.article, comment],
               method: :delete,
               data: { confirm: 'Are you sure?' } %>
</p>

app/views/comments/-form.html.erb

<%= form_for([@article, @article.comments.build]) do |f| %>
  <p>
    <%= f.label :commenter %><br>
    <%= f.text_field :commenter %>
  </p>
  <p>
    <%= f.label :body %><br>
    <%= f.text_area :body %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

上傳程式碼倉庫和雲端專案部署

git remote add origin https://github.com/shenzhoudance/xiaoweiblog.git

git push --all origin