Rails 指南第 5.12 节中的 UrlGenerationError [英] UrlGenerationError on section 5.12 of Rails Guide
问题描述
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,出现此错误:
ActionController::UrlGenerationError in Posts#index显示 C:/RailsInstaller/blog/app/views/posts/index.html.erb 其中第 16 行提出:没有路由匹配 {:action=>"show", :controller=>"posts"} 缺少必需的键:[:id]提取的源代码(围绕第 16 行):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<%结束%>
此外,当我尝试编辑帖子时,在我的 edit.html.erb 文件中收到一个 SyntaxError:
C:/RailsInstaller/blog/app/views/posts/edit.html.erb:3: 语法错误,意外的'}',需要keyword_end';@output_buffer.append= form_for :post, url: post_path(@post.id) },^C:/RailsInstaller/blog/app/views/posts/edit.html.erb:32: 语法错误,意外的keyword_ensure,期待$end
具体来说,用这一行:
<%= form_for :post, url: post_path(@post.id) },方法: :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:
posts_controller.rb:
class PostsController
应用控制器
def 索引@posts = Post.all结尾定义新@post = Post.new结尾定义创建@post = Post.new(params[:post].permit(:title, :text))如果@post.save重定向到@post别的呈现新"结尾结尾高清秀@post = Post.find(params[:id])结尾定义更新@post = Post.find(params[:id])如果@post.update(params[:post].permit(:title, :text))重定向到@post别的渲染编辑"结尾结尾定义编辑@post = Post.find(params[:id])结尾私人的def post_paramsparams.require(:post).permit(:title, :text)结尾结尾
edit.html.rb:
编辑帖子
<%= form_for :post, url: post_path(@post.id) },方法: :patch do |f|%><% 如果@post.errors.any?%><div id="错误解释"><h2><%=pluralize(@post.errors.count, "error") %>禁止此帖子已被保存:</h2><ul><% @post.errors.full_messages.each 做 |msg|%><li><%=msg%></li><%结束%>
<%结束%><p><%= f.label :title %><br><%= f.text_field :title %></p><p><%= f.label :text %><br><%= f.text_area :text %></p>
<%= f.submit %>
路线:RB:
Blog::Application.routes.draw 做资源:帖子根到:欢迎#index"结尾
说错误是由这一行引起的
<%= link_to 'Show', post_path %></td>应该是
<%= link_to 'Show', post %>
或
<%= link_to 'Show', post_path(post) %></td>I'm following the Getting Started tutorial for Rails 4.0.0 located here: http://guides.rubyonrails.org/getting_started.html#updating-posts
When I try to navigate from the main page (localhost) to localhost/posts, I am getting this error:
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 %>
Additionally, when I try to edit a post, I receive a SyntaxError in my edit.html.erb file:
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
Specifically, with this line:
<%= form_for :post, url: post_path(@post.id) },
method: :patch do |f| %>
This my first attempt at learning Rails, so I'm having a difficult time understanding where to even begin to look when I'm getting these errors. Here are some relevant files:
posts_controller.rb:
class 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
edit.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.submit %>
routes:rb:
Blog::Application.routes.draw do
resources :posts
root to: "welcome#index"
end
解决方案 it says the error is caused by this line
<td><%= link_to 'Show', post_path %></td>
It should be
<td><%= link_to 'Show', post %></td>
or
<td><%= link_to 'Show', post_path(post) %></td>
这篇关于Rails 指南第 5.12 节中的 UrlGenerationError的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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