使用Mongoid访问Rails 3上的子文档 [英] accessing sub documents on Rails 3 using Mongoid
问题描述
此处，您会发现Ryan的轨道广播 Mongoid(已修订) strong>.
Here you will find Ryan's railscast called Mongoid (revised).
我已经按照railscast创建了一个应用程序，并将其放在 https://github.com/tenzan /store.git
I've created an app following the railscast and put it on https://github.com/tenzan/store.git
在此示例中，产品集合已嵌入评论.
In this example, product collection has embedded reviews.
我能够在Rails控制台中添加评论，并希望在浏览器中显示我不知道的内容.
I was able to add reviews within from rails console and wanted to display on the browser, what I can't figure out.
我觉得我必须调整
app/controllers/reviews_controller.rb
和
app/views/reviews/index.html.erb
该应用是由Rails 3和ruby 1.9.3p429创建的.
The app was created Rails 3 and ruby 1.9.3p429.
我有2个模型. product.rb
I've 2 models. product.rb
class Product
include Mongoid::Document
include Mongoid::Timestamps
field :name, type: String
field :price, type: BigDecimal
field :released_on, type: Date
attr_accessible :name, :price, :released_on
validates_presence_of :name
embeds_many :reviews
accepts_nested_attributes_for :reviews
end
and review.rb
and review.rb
class Review
include Mongoid::Document
field :content, type: String
embedded_in :product
end
我在产品集中有一个文档:
I have one document in the products collection:
{
"_id" : ObjectId("51b1eac0311b6dd93a000001"),
"created_at" : ISODate("2013-06-07T14:14:24.714Z"),
"name" : "Apple",
"price" : "34.45",
"released_on" : ISODate("2013-06-06T00:00:00Z"),
"reviews" : [
{
"_id" : ObjectId("51b1ec2b311b6db065000001"),
"content" : "greate game!"
},
{
"_id" : ObjectId("51b1ec56311b6db065000002"),
"content" : "cool game!"
}
],
"updated_at" : ISODate("2013-06-07T14:14:24.714Z")
}
我想在单独的页面上访问产品的评论，因此我在 app/views/products/show.html.erb 上放置了一个链接:
I wanted to access the reviews for the products on the separate page, so I've put a link on the app/views/products/show.html.erb:
<p id="notice"><%= notice %></p>
<p>
<b>Name:</b>
<%= @product.name %>
</p>
<p>
<b>Price:</b>
<%= @product.price %>
</p>
<p>
<b>Released on:</b>
<%= @product.released_on %>
</p>
<table border = 1>
<tr>
<th>Reviews</th>
</tr>
<% @product.reviews.each do |review| %>
<tr>
<td><%= review.content %></td>
</tr>
<% end %>
</table>
<%= link_to "Reviews", product_reviews_path(@product) %>
<br />
<%= link_to 'Edit', edit_product_path(@product) %> |
<%= link_to 'Back', products_path %>
耙路:
product_reviews GET /products/:product_id/reviews(.:format) reviews#index
POST /products/:product_id/reviews(.:format) reviews#create
new_product_review GET /products/:product_id/reviews/new(.:format) reviews#new
edit_product_review GET /products/:product_id/reviews/:id/edit(.:format) reviews#edit
product_review GET /products/:product_id/reviews/:id(.:format) reviews#show
PUT /products/:product_id/reviews/:id(.:format) reviews#update
DELETE /products/:product_id/reviews/:id(.:format) reviews#destroy
products GET /products(.:format) products#index
POST /products(.:format) products#create
new_product GET /products/new(.:format) products#new
edit_product GET /products/:id/edit(.:format) products#edit
product GET /products/:id(.:format) products#show
PUT /products/:id(.:format) products#update
DELETE /products/:id(.:format) products#destroy
我认为，当我单击 app/views/products/show.html.erb 中的链接时:
I assumed, when I click on the link from the app/views/products/show.html.erb:
<%= link_to "Reviews", product_reviews_path(@product) %>
它将带我进入 app/views/reviews/index.html.erb :
<h1>Reviews</h1>
<% @product = Product.find(params[:product_id]) %>
<table>
<tr>
<th>Content</th>
</tr>
<% @product.reviews.each do |review| %>
<tr>
<td><%= review.content %></td>
</tr>
<% end %>
</table>
将我带到 app/views/reviews/index.html.erb 时，出现错误:
When it take me to app/views/reviews/index.html.erb, I got error:
NoMethodError in ReviewsController#index
undefined method `reviews' for nil:NilClass
Rails.root: /Users/askar/Dropbox/rails_studio/store
Application Trace | Framework Trace | Full Trace
app/controllers/reviews_controller.rb:4:in `index'
Request
Parameters:
{"product_id"=>"51b1eac0311b6dd93a000001"}
我的 app/controllers/reviews_controller.rb 如下:
class ReviewsController < ApplicationController
def index
@reviews = @products.reviews
end
end
我相信我犯了一个小错误.
I believe I'm doing a trivial mistake.
顺便说一句，我能够在 app/views/products/show.html.erb 上显示嵌入的评论文档，但我想在 app/views/上显示reviews/index.html.erb
By the way, I was able to display reviews embedded documents on the app/views/products/show.html.erb, but I wanted to display on the app/views/reviews/index.html.erb
推荐答案
已解决. Aash Dhariya协助Google杂种小组解决了这个问题.
Solved. Aash Dhariya helped to solve this in the mongoid google groups.
我确实更改了 reviews_controller.rb :
class ReviewsController < ApplicationController
def index
@product = Product.find(params[:product_id])
@reviews = @product.reviews
end
end
和 app/views/reviews/index.html.erb :
<h1>Reviews</h1>
<% @product = Product.find(params[:product_id]) %>
<table>
<tr>
<th>Content</th>
</tr>
<% @reviews.each do |review| %>
<tr>
<td><%= review.content %></td>
</tr>
<% end %>
</table>
<br />
现在，它在单独的页面上显示评论！ :)
Now it's showing the reviews on a separate page! :)
这篇关于使用Mongoid访问Rails 3上的子文档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！
