gistfile1.js

var mongoose = require('mongoose')
  , Futures  = require('futures')
  , Schema   = mongoose.Schema
  , db = mongoose.connect('mongodb://localhost/mongoose-db');
  
var UserSchema = new Schema({
    "name":       {type: String},
    "location": {
      "latitude":  {type: Number, required: true, min: -90, max: 90},
      "longitude": {type: Number, required: true, min: -180, max: 180}
    }
});
mongoose.model('User', UserSchema);


var User = mongoose.model('User')
  , sequence = Futures.sequence();
  
var saveUser = function(o, cb) {
  var user = new User(o);
  user.save(function(err, u) {
    if (err) {
      console.log(err);
    } else {
      console.log(u);
    }
    cb();
  });
};

sequence
  .then(function(next) {
    /**
     * normal insert
     * -------------
     * { location: { longitude: 2.352, latitude: 48.867 },
     *   _id: 4def70666a9e10e842000001,
     *   name: 'hugues dubois' }
     **/
    saveUser({
      "name": "hugues dubois",
      "location": {
        "latitude":  48.867,
        "longitude": 2.352
      }
    }, next);
  })
  .then(function(next) {
    /**
     * normal insert
     * -------------
     * { location: { longitude: 2.352, latitude: 48.867 },
     *   _id: 4def70666a9e10e842000001,
     *   name: 'hugues dubois' }
     **/
    saveUser({
      "name": "hugues dubois",
      "location": {
        "latitude":  "48.867",
        "longitude": "2.352"
      }
    }, next);
  })
  .then(function(next) {
    /**
     * normal error
     * -------------
     * { stack: [Getter/Setter],
     *   message: 'Validation failed',
     *   name: 'ValidationError',
     *   errors: { 'location.latitude': 'Validator "min" failed for path location.latitude' } }
     **/
    saveUser({
      "name": "hugues dubois",
      "location": {
        "latitude":  -91,
        "longitude": -180
      }
    }, next);
  })
  .then(function(next) {
    /**
     * normal error
     * -------------
     * { stack: [Getter/Setter],
     *   message: 'Validation failed',
     *   name: 'ValidationError',
     *   errors:
     *     { 'location.longitude': 'Validator "required" failed for path location.longitude',
     *       'location.latitude': 'Validator "required" failed for path location.latitude' } }
     **/
    saveUser({
      "name": "hugues dubois",
      "location": {
        "latitude":  "",
        "longitude": ""
      }
    }, next);
  })
  .then(function(next) {
    /**
     * ERROR IN MONGOOSE THE NUMBER IS CASTED TO 0
     * -------------
     * { location: { longitude: 0, latitude: 0 },
     *   _id: 4def749a3ff4c38543000004,
     *   name: 'hugues dubois' }
     **/
    saveUser({
      "name": "hugues dubois",
      "location": {
        "latitude":  " ", /*ERROR IN MONGOOSE THIS IS CASTED TO 0*/
        "longitude": " "  /*ERROR IN MONGOOSE THIS IS CASTED TO 0*/
      }
    }, next);
  })
  .then(function() {
    db.disconnect();
  });