title: How add hash-key in form field
body: <p>I have a model attribute 'options', and I want record to it a hash with a few parameters.For example:</p>
  
  <pre><code>options:
      name: 'username'
      address: 'useraddress'
      age: 'userage'
  </code></pre>
  
  <p>To do this, I use <em>serialize</em></p>
  
  <pre><code>  serialize :options, Hash
  </code></pre>
  
  <p>how to make the right form for this to work</p>
  
  <p>how make it?</p>
  
  <p>sorry for my bad English</p>