精品文档---下载后可任意编辑rails new blogcd blograils g scaffold post title:string text:textrails g model comment post_id:integer text:textrake db:migraterails s测试:http://localhost:3000/posts精品文档---下载后可任意编辑删除原有的内容，新的内容如下：1.

<%= @post.title %>

精品文档---下载后可任意编辑2. 3. <%= @post.text %> 4. 5.

6. <%= link_to "Back", posts_path %> 7. | 8. <%= link_to "Edit", edit_post_path(@post) %> 9. | 10. <%= link_to "Delete",@post,:method => :delete, :confirm => "Are you sure?" %> 11.

来源： 增加 Comments 项1.

<%= @post.title %>

2. 3. <%= @post.text %> 4. 5.

Comments

6. 7. <% @post.comments.each do |comment| %> 8.

<%= comment.text %>

9.

<%= time_ago_in_words comment.created_at %> ago

10. <% end %> 11. 12. <%= form_for [@post,@post.comments.build] do |f| %> 13.

<%= f.text_area :text, :size => '40x10' %>

14.

<%= f.submit "Post Comment" %>

15. <% end %> 16. 17.

18. <%= link_to "Back", posts_path %> 19. | 20. <%= link_to "Edit", edit_post_path(@post) %> 21. | 22. <%= link_to "Delete",@post,:method => :delete, :confirm => "Are you sure?" %> 23.

1.2. 增加 has_many :comments 增加 belongs_to :post 1. resources :posts do 2. resources :comments 3. end 这个时候 Comment 就出来了，但是假如提交 comment，还会报错，因为我们还没写 comment 的controller打开一个新的命令行D:\Ruby\projects>cd blogD:\Ruby\projects\blog>rails g controller comments create destroy精品文档---下载后可任意编辑1. class CommentsController < ApplicationController 2. def create 3. @post = Post.find(params[:post_id]) 4. @comment = @post.comments.build(comment_params) 5. @comment.save 6. 7. redirect_to @post 8. end 9. def comment_params params.require(:comment).permit(:id, :text)end10. def destroy 11. end 12....