rimary Keys</h1>
    <div id="version" class="clickable" onclick='document.location = "http://rubygems.org/gems/composite_primary_keys"; return false'>
      Get Version
      <a href="http://rubygems.org/gems/composite_primary_keys" class="numbers">7.0.0</a>
    </div>
    <h1>&#8594; Ruby on Rails</h1>
<h1>&#8594; ActiveRecords</h1>
<h2>What</h2>
<p>Ruby on Rails does not support composite primary keys. This free software is an extension <br />
to the database layer of Rails &#8211; <a href="http