gistfile1.txt

ActionView::Template::Error (You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.to_key):
    1: $("#<%= dom_id(@comment.comment_title) %>").parent().append('<%= escape_javascript(render(@comment)) %>');
    2: $(".comment_form")[0].reset();
  app/views/comments/create.js.erb:1:in `_app_views_comments_create_js_erb___503385093_2173588800_0'
  app/controllers/comments_controller.rb:8:in `create'