title: Mongoose.js: force always populate
body: <p>Is there a way to instruct model to populate ALWAYS a certain field?</p>
  
  <p>Something like, to have "field" populated in any find query:</p>
  
  <pre><code>{field: Schema.ObjectId, ref: 'Ref', populate: true}
  </code></pre>
  
  <p>?</p>