title: Return the Record with the highest count of reference ids Active Record
body: <p>Find the country with the highest number of engineers</p>
  
  <p>Engineers have a country_id referencing the table Countries, i found the answer through guess and check but i would love to know how to <strong>return a single country with the highest count of engineers</strong>, i've been looking for almost 24 hours now... HELP please</p>
  
  <pre><code>country = Country.find(34);
    country.engineers.count;
    =&gt; 9.
  </code></pre>
  
  <p>so far thats what i got</p>