title: Mongoid embedded_in many documents
body: <p>I wanna have an Image_Model which defines x, y, width, height, name,...
  This model should be embedded_in many other Models.</p>
  
  <p>Example:</p>
  
  <pre><code>User embeds_many images
  Product embeds_many images
  </code></pre>
  
  <p>is this possible or do I have it like this:</p>
  
  <pre><code>User embeds_many user_images
  Product embeds_many product_images
  </code></pre>
  
  <p>What is the best way to go?</p>
  
  <p>many thanks in advance</p>