如果我有一个模型...
class Post
include Mongoid::Document
field :link
field :title
field :synopsis
field :added_on, :type => Date
validates_presence_of :link
embeds_many :replies
references_one :topic
end
和
class Topic
include Mongoid::Document
field :category
referenced_in :post
end
我需要在 index.html.erb 中编写什么代码才能访问主题中的数据或添加要发布的主题。
我尝试了 post.topic,但出现未定义方法错误。
非常感谢。
编辑:
这是index.html代码
<div id="post">
<% @posts.each do |post| %>
<div class="title_container">
<%= link_to post.title, post.link %> || <%= link_to 'Edit', edit_post_path(post) %> || <%= post.topic %>
</div>
<% end %>
<br />
<h2>Topics<h2>
<% for topic in @post.topics %>
<h3><%= topic.category %></h3>
<% end %>
</div>
这是 posts_controller
class PostsController < ApplicationController
# GET /posts
# GET /posts.xml
def index
@posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
end
end
# GET /posts/1
# GET /posts/1.xml
def show
@post = Post.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @post }
end
end
# GET /posts/new
# GET /posts/new.xml
def new
@post = Post.new
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => @post }
end
end
# GET /posts/1/edit
def edit
@post = Post.find(params[:id])
end
# POST /posts
# POST /posts.xml
def create
@post = Post.new(params[:post])
respond_to do |format|
if @post.save
format.html { redirect_to(@post, :notice => 'Post was successfully created.') }
format.xml { render :xml => @post, :status => :created, :location => @post }
else
format.html { render :action => "new" }
format.xml { render :xml => @post.errors, :status => :unprocessable_entity }
end
end
end
# PUT /posts/1
# PUT /posts/1.xml
def update
@post = Post.find(params[:id])
respond_to do |format|
if @post.update_attributes(params[:post])
format.html { redirect_to(@post, :notice => 'Post was successfully updated.') }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @post.errors, :status => :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.xml
def destroy
@post = Post.find(params[:id])
@post.destroy
respond_to do |format|
format.html { redirect_to(posts_url) }
format.xml { head :ok }
end
end
end
编辑:
我还添加了相关的 _form.html.erb 代码。
<div class="field">
<%= f.label :topic_id %>
<%= f.collection_select :topic, Post.topic, :id, :category, :prompt => "Select a Topic" %>
</div>
编辑:
更新到2.0.0.rc.7还是无法获取。
尝试了 railscast 视频 (http://railscasts.com/episodes/238-mongoid) 中的关键方法只是为了好玩。我收到“PostsController#update 中的 BSON::InvalidObjectId”错误。
最佳答案
我猜一个主题有很多帖子?如果您想要引用关联,则需要将其更改为此。
class Post
#...
referenced_in :topic
end
class Topic
#...
references_many :posts
end
然后尝试将您的 collection_select 行更改为:
<%= f.collection_select :topic_id, Topic.all, :id, :category, :prompt => "Select a Topic" %>
关于ruby-on-rails - 使用 mongoid/mongodb/rails 访问引用字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4836589/