title: in mongoose, how to select the fields in a array property
body: <p>in Mongoose, I have such a schema </p>
  
  <pre><code>var schema= mongoose.Schema({
           name:String,
           age:String
           likes: [{ type:String, price:String}]                       
  });
  </code></pre>
  
  <p>As in the mongoose, the <strong>option</strong> in the <strong>Model.find(conditions, [fields], [options], [callback])</strong> gives us a choice to select the fields we need. However in my schema, there is a array property 'likes', and in the query, I only want to select only one property type rather than all of them, how can I make this query ?</p>