title: How to make a unique number in the _id
body: <p>Unfortunately, I can't figure out how to turn the _id ObjectID, into a _id with a unique number generated by a number.</p>
  <p>For example:
  Right now the generation is like this</p>
  <pre><code>[
  {
   _id: 'adioj2ouro21jr9o3',
   // ...
  }
  ]
  </code></pre>
  <p>And we need to</p>
  <pre><code>[
  {
   id: 1,
   // ...
  }
  ]
  </code></pre>