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PORails 3, Polymorphic Associations, and No Route Matches
 

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  1. PORails 3, Polymorphic Associations, and No Route Matches
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    <p>I've been learning Rails for about 6 weeks now, so still a noob!</p> <p>I'm following Ryan Bates screencast on Polymorphic Associations, but I'm getting a "No Route Matches" error when navigating to /model/xx/comments.</p> <p>After two days going round in circles with this I'm totally stumped—everything appears to be in place.</p> <p>Comments model:</p> <pre><code>create_table "comments", :force =&gt; true do |t| t.text "content" t.integer "user_id" t.integer "commentable_id" t.string "commentable_type" t.datetime "created_at" t.datetime "updated_at" end </code></pre> <p>Comments class:</p> <pre><code>class Comment &lt; ActiveRecord::Base belongs_to :commentable, :polymorphic =&gt; true end </code></pre> <p>Other models class:</p> <pre><code>class ModelName &lt; ActiveRecord::Base has_many :comments, :as =&gt; :commentable end </code></pre> <p>Routes.rb</p> <pre><code>resources :modelname, :has_many =&gt; :comments </code></pre> <p>comments_controller.rb</p> <pre><code>def index @commentable = find_commentable @comments = @commentable.comments end private def find_commentable params.each do |name, value| if name =~ /(.+)_id$/ return $1.classify.constantize.find(value) end end nil end </code></pre> <p>This all according to the tutorial, but nonetheless is returning "no route matches".</p> <p>I have tried alternative formatting of the routes as nested resources.</p> <pre><code>resources :modelname do |modelname| modelname.resources :comments end </code></pre> <p>Explicitly defining comments in routes.rb</p> <pre><code>resources :comments </code></pre> <p>And various combinations of terms in routes.rb</p> <pre><code>resources :modelname, :has_many =&gt; :commentables </code></pre> <p>or</p> <pre><code>resources :modelname, :has_many =&gt; :comments </code></pre> <p>or</p> <pre><code>resources :modelname, :has_many =&gt; :comments, :through =&gt; :commentable </code></pre> <p>all without success.</p> <p>Has anyone else encountered this? I'm lost as to where to begin looking.</p> <p>Many thanks </p>
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