Ruby on Rails的 - Settting了评论功能 [英] Ruby on Rails - Settting up Reviews functionality
问题描述
我试图建立在我的Ruby on Rails应用程序功能，可让用户查看照片。
I am trying to set up a feature on my Ruby on Rails app that lets users to review pictures.
我已经按照本指南作为参考。
I've followed this guide as a reference.
http://ruby.about.com/od/rubyonrails/ss/ blogpart4_4.htm
从我的经验对其他Ruby工作on Rails的项目，我觉得文章/评论关系模型在这里可以用于图片/点评关系。
From my experiences working on other Ruby on Rails projects, I think a Posts/Comments relationship model can be used here for a Pictures/Reviews relationship.
我第一次产生了脚手架。
I first generated a scaffold.
rails g scaffold review name:string body:text picture:references
我想每个图片页面有其自己的意见一个单独的页面。
I would like each picture page to have a separate page for its own reviews.
因为我并不需要一个索引页对我的评论的控制器，我删除了这条线从我的routes.rb文件
Since I don't need an Index Page for my reviews controller, I removed this line from my routes.rb file
resources: reviews
我取代，通过创建路由
I replaced that by creating routes
match '/pictures/:id/reviews', to: 'reviews#show', via: 'get'
match '/pictures/:id/reviews/edit', to: 'reviews#edit', via: 'get'
match '/pictures/:id/reviews/new', to: 'reviews#new', via: 'get'
在这里，我的道路涉及的图片里面嵌套评论。
Here, my path involves nesting reviews inside pictures.
路线
favorite_picture_path PUT /pictures/:id/favorite(.:format) pictures#favorite
pictures_path GET /pictures(.:format) pictures#index
POST /pictures(.:format) pictures#create
new_picture_path GET /pictures/new(.:format) pictures#new
edit_picture_path GET /pictures/:id/edit(.:format) pictures#edit
picture_path GET /pictures/:id(.:format) pictures#show
PATCH /pictures/:id(.:format) pictures#update
PUT /pictures/:id(.:format) pictures#update
DELETE /pictures/:id(.:format) pictures#destroy
users_path GET /users(.:format) users#index
POST /users(.:format) users#create
new_user_path GET /users/new(.:format) users#new
edit_user_path GET /users/:id/edit(.:format) users#edit
user_path GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
sessions_path POST /sessions(.:format) sessions#create
new_session_path GET /sessions/new(.:format) sessions#new
session_path DELETE /sessions/:id(.:format) sessions#destroy
contacts_path POST /contacts(.:format) contacts#create
new_contact_path GET /contacts/new(.:format) contacts#new
root_path GET / pictures#welcome
users_new_path GET /users/new(.:format) users#new
about_path GET /about(.:format) pictures#about
GET /contacts(.:format) contacts#new
GET /users/:id/favorites(.:format) users#favorites
signup_path GET /signup(.:format) users#new
signin_path GET /signin(.:format) sessions#new
signout_path DELETE /signout(.:format) sessions#destroy
GET /pictures/:id/reviews(.:format) reviews#show
GET /pictures/:id/reviews/edit(.:format) reviews#edit
GET /pictures/:id/reviews/new(.:format) reviews#new
updated_path GET /updated(.:format) pictures#newest_updates
GET /top-rated(.:format) pictures#high_ratings
ReviewsController
class ReviewsController < ApplicationController
before_action :set_review, only: [:show, :edit, :update, :destroy]
def show
@picture = Picture.find(params[:id])
@review = Review.find(params[:id])
end
def new
@review = Review.new
end
def edit
@picture = Picture.find(params[:picture_id])
@review = Review.find(params[:id])
end
def create
@picture = Picture.find(params[:picture_id])
@review = @picture.reviews.build(params[:review])
if @review.save
;flash[:notice] = 'Review was successfully created.'
redirect_to @picture
else
flash[:notice] = "Error creating review: #{@review.errors}"
redirect_to @picture
end
end
def update
@picture = Picture.find(params[:picture_id])
@review = Review.find(params[:id])
if @review.update_attributes(params[:review])
flash[:notice] = "Review updated"
redirect_to @picture
else
flash[:error] = "There was an error updating your review"
redirect_to @picture
end
end
def destroy
@picture = Picture.find(params[:picture_id])
@review = Review.find(params[:id])
@review.destroy
redirect_to(@review.post)
end
private
def set_review
@review = Review.find(params[:id])
end
def review_params
params.require(:review).permit(:username, :body, :picture_id)
end
end
我从ReviewsController删除索引操作。
I deleted the index action from my ReviewsController.
模式
class Review < ActiveRecord::Base
belongs_to :picture
end
class Picture < ActiveRecord::Base
has_many :reviews
end
以上，我建立了图片和评论之间存在一个一对多的关系。
Above, I established a one-to-many relationship between pictures and reviews.
评论迁移
class CreateReviews < ActiveRecord::Migration
def change
create_table :reviews do |t|
t.string :username
t.text :body
t.references :picture, index: true
t.timestamps
end
end
end
根据我的on Rails的理解，这应该工作。
Based on my understanding on Rails, this should work.
图片＃显示页面
<% @title = "#{@picture.title}" %>
<h4 class = 'indent'>Picture Statistics</h4>
<ul id = 'view'>
<li><strong>Title:</strong> <%= @picture.title %></li>
<li><strong>Category:</strong> <%= @picture.category %></li>
<li><strong>Rating:</strong> <%= pluralize(@picture.rating, 'Star') %></li>
<li><strong>Favorited:</strong> By <%= pluralize(@picture.users.count, 'User') %></li></br>
</ul>
<% if @picture.rating > 4 %>
<button class = 'top-picture'>Top Rated</button>
<% end %>
<%= form_for @picture do |f| %>
<p>
<%= f.label :stars, 'Rating', class: 'indent' %>
<div class= "rating">
1 ☆<%= f.radio_button :stars, '1' %>
2 ☆<%= f.radio_button :stars, '2' %>
3 ☆<%= f.radio_button :stars, '3' %>
4 ☆<%= f.radio_button :stars, '4' %>
5 ☆<%= f.radio_button :stars, '5' %>
</div>
</p>
<p class = 'indent'>
<input class="btn btn-info" type="submit" value="Review">
</p>
<a href = "/pictures/:id/reviews">Reviews</a>
<% end %>
<p class = 'indent'>
<a class="btn btn-info" href="/pictures" role="button">Index</a>
</p>
然而，当我点击我的图片/链路上的：ID（显示页）
However, when I click on a link in my Pictures/:id(show page)
<a href = "/pictures/:id/reviews">Reviews</a>
RecordNotFound错误
Active Record::RecordNotFound in ReviewsController#show
Couldn't find Review with id=:id
Extracted source (around line #54):
53 def set_review
54 @review = Review.find(params[:id])
55 end
56
57 def review_params
因为我遇到了一个错误RecordNotFound，我怀疑问题出在ReviewsController，最有可能与PARAMS。
Since I encountered a RecordNotFound error, I suspect the problem lies in the ReviewsController, most likely with the params.
我相信我有正确的想法，但我什么地方弄错了。反馈和批评都大大AP preciated。很抱歉，如果这听起来像一个愚蠢的问题，我只是没有在Ruby中非常好。
I believe that I have the right idea, but I made a mistake somewhere. Feedback and criticism are greatly appreciated. Sorry if this sounds like a stupid question, I'm just not very good in Ruby.
推荐答案
路线
有关子孙后代着想，你最好设置你的路由，如下所示：
For the sake of posterity, you'll be best setting your routes up as follows:
#config/routes.rb
resources :pictures do
resources :reviews, only: [:show, :edit, :new]
end
每当您创建Rails的路线，你需要记住的整个框架一直围绕打造的对象/资源。这就是为什么路由被称为足智多谋路线（为什么他们有资源指令） - 它们允许你定义路由围绕的应用程序的不同的资源
Whenever you create routes in Rails, you need to remember the entire framework has been built around "objects" / "resources". That's why the routes are known as resourceful routes (and why they have the resources directive) - they allow you to define the routes around the different resources of your application
我已经推荐使用嵌套在 资源结构。
I've recommend using a nested resources structure.
-
助手
您的问题是使用由桑托斯之类的提供的code解决。 IE浏览器：
Your problem was resolved using the code provided by Santosh and the like. IE:
<%= link_to "Your Link", your_link_path(@object) %>
您需要的AP preciate的如何的工作原理。每次使用路线帮助在Rails中（在的link_to 助手）的时候，它会去翻你的路由和放大器;发现它所需要的信息。
You need to appreciate how this works. Each time you use a route helper in Rails (in the link_to helper), it will look through your routes & find the details it needs.
您被引用以下路径：图片/：ID /条 - 因为发现了，这是错误的，因为Rails没有对链接的网址之外任何影响构建它的渲染时间。
You were referencing the following path: pictures/:id/reviews - as discovered, this is wrong because Rails does not have any bearing on the URL of a link besides building it at render time.
考虑Rails是一个无国籍基于HTTP的框架，Rails有整理在每次的任何数据请求。这意味着如果你想建立联系，你必须让Rails的建设在渲染环节，通过一组静态数据通过你的控制器后端
Considering Rails is a stateless HTTP-based framework, Rails has to collate any data upon each request. This means if you want to build links, you have to let Rails build the link at render, passing a static set of data through to your controller in the back-end
希望这有助于？
这篇关于Ruby on Rails的 - Settting了评论功能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！
