1250.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var assert = require('assert')

console.log('\n===========');
console.log('    mongoose version: %s', mongoose.version);
console.log('========\n\n');

var venueSchema = new Schema({
  foursquare: {
    stats: {
      checkinsCount: Number,
      tipsCount:Number
    }
  }
});
venueSchema.virtual('mentions').get(function () {
  if (this.foursquare.stats.checkinsCount) {
    console.log('works');
    return this.foursquare.stats.checkinsCount;
  } else {
    console.log('nothing');
    return 0;
  }
})

var A = mongoose.model('A', venueSchema);

var a = new A({ foursquare: { stats: { checkinsCount: 3 }}});
var b = new A;
console.log(a.mentions); // works 3
console.log(b.mentions); // nothing 0