我正在关注位于此处的 Rails 4.0.0 入门教程：http: //guides.rubyonrails.org/getting_started.html#updating-posts
当我尝试从主页 (localhost) 导航到 localhost/posts 时，我收到此错误：
ActionController::UrlGenerationError in Posts#index
Showing C:/RailsInstaller/blog/app/views/posts/index.html.erb where line #16 raised:
No route matches {:action=>"show", :controller=>"posts"} missing required keys: [:id]
Extracted source (around line #16):
13 <tr>
14 <td><%= post.title %></td>
15 <td><%= post.text %></td>
16 <td><%= link_to 'Show', post_path %></td>
17 <td><%= link_to 'Edit', edit_post_path(post) %></td>
18 </tr>
19 <% end %>
此外，当我尝试编辑帖子时，我在 edit.html.erb 文件中收到 SyntaxError：
C:/RailsInstaller/blog/app/views/posts/edit.html.erb:3: syntax error, unexpected '}', expecting keyword_end
';@output_buffer.append= form_for :post, url: post_path(@post.id) },
^
C:/RailsInstaller/blog/app/views/posts/edit.html.erb:32: syntax error, unexpected keyword_ensure, expecting $end
具体来说，使用这一行：
<%= form_for :post, url: post_path(@post.id) },
method: :patch do |f| %>
这是我第一次尝试学习 Rails，所以当我遇到这些错误时，我很难理解从哪里开始寻找。以下是一些相关文件：
post_controller.rb：
类 PostsController < ApplicationController
def index
@posts = Post.all
end
def new
@post = Post.new
end
def create
@post = Post.new(params[:post].permit(:title, :text))
if @post.save
redirect_to @post
else
render 'new'
end
end
def show
@post = Post.find(params[:id])
end
def update
@post = Post.find(params[:id])
if @post.update(params[:post].permit(:title, :text))
redirect_to @post
else
render 'edit'
end
end
def edit
@post = Post.find(params[:id])
end
private
def post_params
params.require(:post).permit(:title, :text)
end
end
编辑.html.rb：
<h1>Editing post</h1>
<%= form_for :post, url: post_path(@post.id) },
method: :patch 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 %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
</p>
<%= f.提交 %>
路线：RB：
Blog::Application.routes.draw do
resources :posts
root to: "welcome#index"
end