Array stored in Mongo fails deep assert comparison to native javascript array with same length and values

I have a field in m开发者_运维技巧ongo defined with the mongoose ORM like so:

state: {type: [Number], required: true }

If I take a peek at a sample document with the mongo console, state looks like

state: [ 1, 1, 1 ]

So far, so good. But strange enough for that same document the following assert fails:

assert.deepEqual state, [ 1, 1, 1 ]

Can't figure out if this is something I'm missing with object comparisons in JS or something to do with the way mongo is returning the state array.

MongoDB has a bug where properties that should be non-enumerable are enumerated:

Eg, an array whose values are:

[ '0', '1']

has the following keys, according to Object.keys():

[ '0', '1', '_atomics', 'validators', '_path', '_parent', '_schema' ]

Note Mongo now uses V8, which supports ES5, which has had the ability to create non-enumerable properties via Object.defineProperty() for many, many years.

As the other poster mentions:

var fixMongoArray = function(array) {
  return Array.prototype.slice.call(array)
}