title: Updating Polymorphic Associations in Rails on change in model name
body: <p>I have three classes Picture, Employee and Product defined this way</p>
  
  <pre><code>Class Picture &lt; ActiveRecord::Base
    belongs_to :imageable, :polymorphic =&gt; true
  end
  
  class Employee &lt; ActiveRecord::Base
    has_many :pictures, :as =&gt; :imageable
  end
  
  class Product &lt; ActiveRecord::Base
    has_many :pictures, :as =&gt; :imageable
  end
  </code></pre>
  
  <p>I want to change the Model name of Picture to Image. What all do I need to update regarding the polymorphic associations?</p>