Rails 4 postgres full text search error (scoped)

Ive been following the railscast on full text search with postgres but I keep getting the following error undefined local variable or method `scoped' for # Ive followed the railscast exactly. I have all the correct gems installed. (pg_search, pg). Here is my code article controller (I'm also using acts_as_taggable here) ``` def index @articles = Article.text_search(params[:query]).page(params[:page]).per_page(3) if params[:tag] @articles = Article.tagged_with(params[:tag]) else @articles = Article.all end end ``` article model ``` def self.text_search(query) if query.present? where("name @@ :q or content @@ :q", q: query) else scoped end end ``` And the form on Article/index ``` <%= form_tag articles_path, method: :get do %> <p> <%= text_field_tag :query, params[:query] %> <%= submit_tag "Search", name: nil %> </p> <% end %> ``` The only difference I noted between the railscast code and mine is that hes using will_paginate but when I change the controller to ``` @articles = Article.text_search(params[:query]) ``` it makes no difference. Ive searched pretty much everywhere but to no avail.