```js
modelSchema.virtual('hashid').get(function () {
  var oidhex = this._id.toHexString()
  return 
hashids.encrypt(parseInt(oidhex.slice(0,12),16),parseInt(oidhex.slice(12),16);
});

modelSchema.virtual('hashid').set(function (hashid) {
  var halves = hashids.decrypt(hashid);
  var zeroes = '000000000000';
  this._id = new 
ObjectID((zeroes+halves[0]).slice(-12)+(zeroes+halves[1]).slice(-12));
}
```

Note that this is untested code written in the Google Groups editor. I have 
no Mongoose or hashids experience - this is going exclusively from the 
documentation. Where the `hashids` object comes from is left as an exercise 
for the reader.

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