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POAccessing a referenced field using mongoid/mongodb/rails
 

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    <p>If I have a model...</p> <pre><code>class Post include Mongoid::Document field :link field :title field :synopsis field :added_on, :type =&gt; Date validates_presence_of :link embeds_many :replies references_one :topic end </code></pre> <p>and</p> <pre><code>class Topic include Mongoid::Document field :category referenced_in :post end </code></pre> <p>What would I need to code in index.html.erb to access data in topic or to add a topic to post.</p> <p>I tried post.topic but I get an undefined method error.</p> <p>Thank you very much.</p> <p>Edit:</p> <p>Here is the index.html code</p> <pre><code>&lt;div id="post"&gt; &lt;% @posts.each do |post| %&gt; &lt;div class="title_container"&gt; &lt;%= link_to post.title, post.link %&gt; || &lt;%= link_to 'Edit', edit_post_path(post) %&gt; || &lt;%= post.topic %&gt; &lt;/div&gt; &lt;% end %&gt; &lt;br /&gt; &lt;h2&gt;Topics&lt;h2&gt; &lt;% for topic in @post.topics %&gt; &lt;h3&gt;&lt;%= topic.category %&gt;&lt;/h3&gt; &lt;% end %&gt; &lt;/div&gt; </code></pre> <p>here is the posts_controller</p> <pre><code>class PostsController &lt; ApplicationController # GET /posts # GET /posts.xml def index @posts = Post.all respond_to do |format| format.html # index.html.erb format.xml { render :xml =&gt; @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 =&gt; @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 =&gt; @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 =&gt; 'Post was successfully created.') } format.xml { render :xml =&gt; @post, :status =&gt; :created, :location =&gt; @post } else format.html { render :action =&gt; "new" } format.xml { render :xml =&gt; @post.errors, :status =&gt; :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 =&gt; 'Post was successfully updated.') } format.xml { head :ok } else format.html { render :action =&gt; "edit" } format.xml { render :xml =&gt; @post.errors, :status =&gt; :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 </code></pre> <p>Edit:</p> <p>I am also adding the relevant _form.html.erb code.</p> <pre><code>&lt;div class="field"&gt; &lt;%= f.label :topic_id %&gt; &lt;%= f.collection_select :topic, Post.topic, :id, :category, :prompt =&gt; "Select a Topic" %&gt; &lt;/div&gt; </code></pre> <p>Edit:</p> <p>Updated to 2.0.0.rc.7 still can't get it.</p> <p>Tried the key method in the railscast video (http://railscasts.com/episodes/238-mongoid) just for fun. I get a "BSON::InvalidObjectId in PostsController#update" error.</p>
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    1. CO@user593120, we can better help you if you post the relevant part of index.html.erb and contoller method.
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    2. CO@user593120 Could you also post the controller code?
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    3. CO@hade @Dogbert I have updated the original post. Is this helpful information?
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