title: What does a symbol (key) means in the simple_navigation gem configuration?
body: <p>Please tell me, what's the purpose of the first argument in the <a href="https://github.com/andi/simple-navigation/wiki/Configuration" rel="nofollow">simple_navigation configuration</a> gem?</p>
  
  <p>For example, look at this code:</p>
  
  <pre><code>SimpleNavigation::Configuration.run do |navigation|
    navigation.auto_highlight = false
    navigation.items do |primary|
      primary.item :report_errors, "Errors Log", report_errors_path
      primary.dom_class = 'nav pull-right'
    end
  end
  </code></pre>
  
  <p>According to wiki:</p>
  
  <blockquote>
    <p>a key (used for identifying the active navigation item in the controllers)</p>
  </blockquote>
  
  <p>but as I noticed, <code>:report_errors</code> argument is only influences on the name of corresponding <code>id</code> attribute in HTML tag.</p>
  
  <p>Thanks for reply.</p>