title: Rails simple form checkbox default to true
body: <p>How do I make a simple for boolean checkbox default to true?</p>
  
  <p><code>assign_client</code> is a boolean field.</p>
  
  <p>I tried these:</p>
  
  <pre><code>&lt;%= f.input :assign_client, :label =&gt; 'Charge Client?', :true %&gt;
  &lt;%= f.input :assign_client, :label =&gt; 'Charge Client?', :value =&gt; :true %&gt;
  &lt;%= f.input :assign_client, :label =&gt; 'Charge Client?', :value =&gt; 1 %&gt;
  </code></pre>
  
  <p>Thanks for the help!</p>