title: Using an if statement with Rails ActiveRecord find method
body: <p>I want to check that a user is included in a group.  In an attempt to do this, I have the following statement:</p>
  
  <pre><code>user_id = current_user.id
  unless (group.user.find(user_id))
    redirect_to different_path
  end
  </code></pre>
  
  <p>Looking at the docs, "A failure to find the requested object raises a ResourceNotFound
  exception if the find was called with an id."  How do I write the unless statement so that it operates properly?</p>