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    <p>The problem is your find_commentable method.</p> <p>Here are the params passed to your CommentsController#create: </p> <pre><code>Started POST "/comments" for 127.0.0.1 at 2012-05-20 13:17:38 -0700 Processing by CommentsController#create as HTML Parameters: {"utf8"=&gt;"✓", "authenticity_token"=&gt;"SOLcF71+WpfNLtpBFpz2qOZVaqcVCHL2AVZWwM2w0C4=", "comment"=&gt;{"text"=&gt;"Test this comment"}, "commit"=&gt;"Create Comment"} </code></pre> <p>Here is your CommentsController#create: </p> <pre><code>def create @commentable = find_commentable @comment = @commentable.comments.build(params[:comment]) #&lt;&lt;&lt;&lt;LINE 13 def find_commentable params.each do |name, value| if name =~ /(.+)_id$/ return $1.classify.constantize.find(value) end end nil end </code></pre> <p>As you can see, find_commentable expects a param like xx_id (for example, comments_id) which it uses to search for an appropriate class (in case of comments_id, it will be Comment), otherwise it returns nil. Refer <a href="http://api.rubyonrails.org/classes/ActiveSupport/Inflector.html#method-i-classify" rel="nofollow">classify and constantize</a> here.</p> <p>Your params do not contain any such param. So, you always get a nil object. </p> <p>Your find_commentable needs some rework. I think in case of nested_fields, it should be an expression like </p> <pre><code>/(.+)_attributes$/ </code></pre> <p>instead of </p> <pre><code>/(.+)_id$/. </code></pre> <p>And you need to have </p> <pre><code>:accepts_nested_attributes_for :commentable </code></pre> <p>in your Comment model class.</p>
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    1. PONo Method Error for "comments", can't find and correct the nil value to make the comment post
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    1. USSalil
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      1. VTUpMod
    1. COHey Salil, I continued to have problems on my side while trying to make the original code work and a friend suggested rewriting the code from scratch (below), but wanted to say thank you for your post.
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      1. USBrian McDonough
 

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