title: Correct user model setup for spree
body: <p>I'm trying to setup spree together with devise (not 'spree_auth_devise' gem but standalone devise). I've followed <a href="http://guides.spreecommerce.com/developer/authentication.html" rel="nofollow">http://guides.spreecommerce.com/developer/authentication.html</a> guide and everything is working well until in a shop I click "Add To Cart" which brings following error:</p>
  
  <pre><code>NoMethodError in Spree::OrdersController#edit
  undefined method `orders' for #&lt;User:0x007f6bb8782730&gt;
  </code></pre>
  
  <p>I can fix that error by adding to User model:</p>
  
  <pre><code>def orders
     spree_orders
  end
  </code></pre>
  
  <p>but I assume that's not the way it should be fixed. </p>
  
  <p>Can anyone tell me the right way of setting it up so that I don't get that error? </p>