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    <p>What I did recently to add a simple rating mechanism to an existing project was the following: </p> <p>I added two fields to an existing table (which contained the items to be rated). Those were:</p> <pre><code>rating_score =&gt; The current score ratings =&gt; The number of ratings which led to the score </code></pre> <p>For example, if five users would've voted "5" for the current item, <code>rating_score</code> would be 25, and ratings would be 5. The current rating would be computed as <code>rating_score / ratings</code>.</p> <p>Then I added a new method to the controller of the items to be rated, called "rate", which looked something like:</p> <pre><code>def rate @item = Item.find(params[:id]) @container = "item"+@item.id.to_s @item.rating_score += params[:rating].to_i @item.ratings += 1 @item.save respond_to do |format| format.js end end </code></pre> <p>My view for that method, called <code>rate.js.erb</code>, would look something like</p> <pre><code>$('#&lt;%= @container %&gt;').html('&lt;%= escape_javascript(render(partial: 'rating', locals: { item: @item })) %&gt;'); </code></pre> <p>This code works only if you've got jQuery installed, but it should be easily translatable to Prototype or whatever JS framework you may be using.</p> <p>And the <a href="http://guides.rubyonrails.org/layouts_and_rendering.html#using-partials" rel="nofollow">partial</a> for the rating, called <code>_rating.html.erb</code>, was something like:</p> <pre><code>&lt;%= form_tag url_for(controller: 'items', action: 'rate', id: item.id), remote: true %&gt; &lt;%= rating_stars(item.rating_score, item.ratings) %&gt; &lt;%= item.ratings %&gt; Votes &lt;/form&gt; </code></pre> <p>In this partial, the <code>rating_stars()</code> helper method generated some kind of star-like representation for the rating, but you can do that however you like.</p> <p>By setting "remote: true" in the form_tag helper, your Rails installation should automatically transmit the request via the installed Javascript framework. This magic is part of the whole <a href="http://www.simonecarletti.com/blog/2010/06/unobtrusive-javascript-in-rails-3/" rel="nofollow">unobtrusive javascript</a> thing going on in Rails lately, which is actually pretty cool.</p> <p>Hope this gives you an idea of how to realize a very simple rating system <strong>with no IP lock feature whatsoever</strong> in Rails.</p>
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