title: sequelize.js - set column value on create
body: <p>What I'm trying to do here is automatically set a column value when the entry gets created.</p>
  
  <p>So let's say that if I were to have a <code>Posts</code> table which has the columns:
  <code>
  :id     :integer     :primary
  :title  :string
  :post   :text
  :slug   :string      :unique
  </code></p>
  
  <p>and I create a new entry of this with sequelize by calling <code>Model.Posts.create</code> then I want the slug column to be automatically set to a value (the title slugified) when it gets created without having to do anything.</p>
  
  <p>How would I have this be done?</p>