title: mongoose add more key:value inside ref field
body: <pre><code>   organs: [
      {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Organ',
        healthValue: { // i want to add this field but it is becoming invalid, not generating auto with default val
          type: Number,
          default: 0,
        }
      },
    ],
  </code></pre>
  <p>I have a user schema and also there is <strong>organs</strong> key in this schema. I'm keeping organs with ref way to get belongs to user organs. I also should keep organ health value but I can not keep it in ref field together as above. How can i do this? Can not I add more key:value to populate (type &amp; ref) fields?</p>