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PORails 4: Unable to retrieve specific attributes of a model that `belongs_to` two other models?
 

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  1. PORails 4: Unable to retrieve specific attributes of a model that `belongs_to` two other models?
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    <p>So I have an <code>Active</code> model (think of it as a User) that uses Devise for authentication. I also have a <code>Rushee</code> model (you can think of them as products), and on each Rushee's profile page, I give Actives the option to leave a <code>Rusheepost</code> (think of them as product reviews).</p> <p>I'll post some of my code first, then will describe the problem.</p> <p>Here are my models:</p> <pre><code>class Rushee &lt; ActiveRecord::Base has_many :rusheeposts, dependent: :destroy class Active &lt; ActiveRecord::Base has_many :rusheeposts, dependent: :destroy class Rusheepost &lt; ActiveRecord::Base belongs_to :active belongs_to :rushee </code></pre> <p>routes.rb</p> <pre><code>devise_for :actives, :path_prefix =&gt; 'my' resources :actives, only: [:index, :show] resources :rushees, only: [:index, :show] do resources :rusheeposts, only: [:create, :destroy] end </code></pre> <p>RusheepostsController</p> <pre><code>before_action :authenticate_active! def create @rushee = Rushee.find(params[:rushee_id]) @rusheepost = @rushee.rusheeposts.build(rusheepost_params) @rusheepost.active = current_active if @rusheepost.save flash[:success] = "Comment created!" redirect_to @rushee else flash[:error] = "There was an error with your comment; please try again." redirect_to @rushee end end private def rusheepost_params params.require(:rusheepost).permit(:content) end </code></pre> <p>RusheesController (I only want signed in actives to be able to view rushees)</p> <pre><code>class RusheesController &lt; ApplicationController before_action :authenticate_active! def show @rushee = Rushee.find(params[:id]) @rusheeposts = @rushee.rusheeposts @rusheepost = @rushee.rusheeposts.build if active_signed_in? end def index @rushees = Rushee.all end end </code></pre> <p><code>show</code> view for Rushees</p> <pre><code>&lt;% provide(:title, @rushee.name) %&gt; &lt;div class="row"&gt; &lt;aside class="span4"&gt; &lt;section&gt; &lt;h1&gt; &lt;%= @rushee.name %&gt; &lt;%= @rushee.email %&gt; &lt;%= @rushee.grade %&gt; &lt;%= @rushee.major %&gt; &lt;/h1&gt; &lt;section&gt; &lt;%= render 'shared/rusheepost_form' %&gt; &lt;/section&gt; &lt;/section&gt; &lt;/aside&gt; &lt;!-- Displays the rusheeposts that are associated with the current rushee --&gt; &lt;div class="span8"&gt; &lt;% if @rushee.rusheeposts.any? %&gt; &lt;h3&gt;Comments (&lt;%= @rusheeposts.count %&gt;)&lt;/h3&gt; &lt;ol class="rusheeposts"&gt; &lt;%= render @rusheeposts %&gt; &lt;/ol&gt; &lt;% end %&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>_rusheepost_form.html.erb</p> <pre><code>&lt;%= form_for([@rushee, @rusheepost]) do |f| %&gt; &lt;%= render 'shared/error_messages', object: f.object %&gt; &lt;div class="field"&gt; &lt;%= f.text_area :content, placeholder: "Compose new comment..." %&gt; &lt;/div&gt; &lt;%= f.submit "Post", class: "btn btn-large btn-primary" %&gt; &lt;% end %&gt; </code></pre> <p>_rusheepost.html.erb</p> <pre><code>&lt;li&gt; &lt;span class="content"&gt;&lt;%= rusheepost.content %&gt;&lt;/span&gt; &lt;span class="timestamp"&gt; Posted &lt;%= time_ago_in_words(rusheepost.created_at) %&gt; ago by: &lt;%= rusheepost.active.name %&gt; &lt;/span&gt; &lt;/li&gt; </code></pre> <p><strong>The Problem</strong></p> <p>The <code>_rusheepost.html.erb</code> partial does not render. The <code>content</code> renders correctly every time. However, if I put <code>Posted &lt;%= rusheepost.created_at %&gt;</code>, it renders to: <code>Posted 2013-12-25 21:08:19 UTC</code>. However, <code>Posted &lt;%= time_ago_in_words(rusheepost.created_at) %&gt;</code> gets me a <code>undefined method '&gt;' for nil:NilClass</code> error.</p> <p>Furthermore, just putting <code>Posted by: &lt;%= rusheepost.active.name %&gt;</code> gets me the same nilclass error. Putting <code>Posted by: &lt;%= rusheepost.active %&gt;</code>, however, gets me: <code>Posted by: #&lt;Active:0x007ff3466108a0&gt;</code>.</p> <p>Strangely enough, everything works if I try to retrieve a rusheepost's rushee attribute. For instance, <code>Posted by: &lt;%= rusheepost.rushee %&gt;</code> yields <code>Posted by: #&lt;Rushee:0x007fa6681a56d8&gt;</code>. Similarly, <code>Posted by: &lt;%= rusheepost.rushee.name %&gt;</code> yields <code>Posted by: Theodora Willms III</code>, the name of the rushee who the post is associated with (and whose page I am on.) Obviously though, this isn't the functionality I want -- I want each post to display who <em>posted</em> it, not who the post is about.</p> <p>Does anyone have any ideas as to why this might be happening? Maybe I didn't initialize something correctly? I am failing to see why I cannot retrieve attributes of a rusheepost's active, but I can retrieve attributes of a rusheepost's rushee. I also must note that before I added the form to create new rusheeposts, I had the resources in my <code>routes.rb</code> listed on top of each other (not nested), and <strong>everything</strong> rendered correctly, including this: <code>Posted &lt;%= time_ago_in_words(rusheepost.created_at) %&gt; by: &lt;%= rusheepost.active.name %&gt;</code>. After I nested the resources and changed my controllers to reflect the nesting, the problems I describe appeared.</p> <p>Thanks, and sorry about the (very) long post. Let me know if there's any more information/code I can post that would help.</p> <p><strong>EDIT</strong>: I also must note that if I reset the database with no rusheeposts, then log in to my site, post on a rushee's page, and then go into <code>rails console</code> and type <code>Rusheepost.first.active.name</code>, I <em>do</em> in fact get the name of the Active that I was signed in as, which makes this all the more puzzling...</p>
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