ruby on rails - Mongoid sorting on custom method -

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I have an object called 'Choice' in my model, which will give the total number of choices for the object. Now I want to sort this model on the basis of overall choice. How can we achieve it in Mongoed?

Now this is a problem. You can not do that which mongoid using silent order objects based on their fields Now if you save 'likes' for every object in the field, well, this is straightforward: 

  Model.desc (: like)   
 If not, you have to use it, which is more complicated like this for a simple matter (of my limited perspective), but of course I Your app does not know, so maybe it compensates.

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