Scrolling Mongoose Objects

I have a Mongoose result object that I would like to skip, but it seems to behave differently than the classic object.

Generally, you cannot loop through uncountable properties with for…in loop

, but that seems to work here. Hence, this does not work with Object.keys

, although it is assumed to fulfill the same properties as for…in

...

Also Object.getOwnPropertyNames(obj)

, which must intersect all properties (enumerable or not) returns none of the selected values. I really don't understand what's going on here.

Here's some sample code and output to illustrate this:

MediaModel.findById('558d0b3a5fa02e7e218b470c', function (err, media) {
    if (err) {
        return console.error(err);
    }

    console.log(media);
    console.log("\n --- \n");
    console.log(Object.getOwnPropertyNames(media));
    console.log("\n---\n");

    for (var prop in media) {
        console.log(prop + ' -- Enumerable : ' +   media.propertyIsEnumerable(prop) + ' -- hasOwnProperty : ' + media.hasOwnProperty(prop) + "\n");
    }
});

      

        
        
        
      

    

It outputs this to the console:

{ _id: 558d0b3a5fa02e7e218b470c,
  name: '54ae5d587860b4.61272171',
  cover: true,
  size: 144,
  audio: 
   { es: '54ae5ec1e31c68.83020900',
     en: '54ae5ec240dd98.65329366',
     fr: '54ae5ec2950737.15028179',
     pt: '54ae5ec2e3bcf5.08479198',
     ar: '54ae5ec33ab8f5.67860635',
     ru: '54ae5ec393d300.66214842' },
  comments: [] }

 --- 

[ '$__',
  'isNew',
  'errors',
  '_doc',
  '$__original_save',
  'save',
  '_pres',
  '_posts' ]

---

$__ -- Enumerable : true -- hasOwnProperty : true

isNew -- Enumerable : true -- hasOwnProperty : true

errors -- Enumerable : true -- hasOwnProperty : true

_doc -- Enumerable : true -- hasOwnProperty : true

$__original_save -- Enumerable : true -- hasOwnProperty : true

save -- Enumerable : true -- hasOwnProperty : true

_pres -- Enumerable : true -- hasOwnProperty : true

_posts -- Enumerable : true -- hasOwnProperty : true

db -- Enumerable : false -- hasOwnProperty : false

discriminators -- Enumerable : false -- hasOwnProperty : false

__v -- Enumerable : false -- hasOwnProperty : false

id -- Enumerable : false -- hasOwnProperty : false

_id -- Enumerable : false -- hasOwnProperty : false

comments -- Enumerable : false -- hasOwnProperty : false

size -- Enumerable : false -- hasOwnProperty : false

length -- Enumerable : false -- hasOwnProperty : false

cover -- Enumerable : false -- hasOwnProperty : false

imdbId -- Enumerable : false -- hasOwnProperty : false

imdbRating -- Enumerable : false -- hasOwnProperty : false

year -- Enumerable : false -- hasOwnProperty : false

actors -- Enumerable : false -- hasOwnProperty : false

writers -- Enumerable : false -- hasOwnProperty : false

director -- Enumerable : false -- hasOwnProperty : false

genre -- Enumerable : false -- hasOwnProperty : false

name -- Enumerable : false -- hasOwnProperty : false

schema -- Enumerable : false -- hasOwnProperty : false

collection -- Enumerable : false -- hasOwnProperty : false

$__handleSave -- Enumerable : false -- hasOwnProperty : false

$__delta -- Enumerable : false -- hasOwnProperty : false

$__version -- Enumerable : false -- hasOwnProperty : false

increment -- Enumerable : false -- hasOwnProperty : false

$__where -- Enumerable : false -- hasOwnProperty : false

remove -- Enumerable : false -- hasOwnProperty : false

model -- Enumerable : false -- hasOwnProperty : false

on -- Enumerable : false -- hasOwnProperty : false

once -- Enumerable : false -- hasOwnProperty : false

emit -- Enumerable : false -- hasOwnProperty : false

listeners -- Enumerable : false -- hasOwnProperty : false

removeListener -- Enumerable : false -- hasOwnProperty : false

setMaxListeners -- Enumerable : false -- hasOwnProperty : false

removeAllListeners -- Enumerable : false -- hasOwnProperty : false

addListener -- Enumerable : false -- hasOwnProperty : false

$__buildDoc -- Enumerable : false -- hasOwnProperty : false

init -- Enumerable : false -- hasOwnProperty : false

$__storeShard -- Enumerable : false -- hasOwnProperty : false

hook -- Enumerable : false -- hasOwnProperty : false

pre -- Enumerable : false -- hasOwnProperty : false

post -- Enumerable : false -- hasOwnProperty : false

removePre -- Enumerable : false -- hasOwnProperty : false

_lazySetupHooks -- Enumerable : false -- hasOwnProperty : false

update -- Enumerable : false -- hasOwnProperty : false

set -- Enumerable : false -- hasOwnProperty : false

$__shouldModify -- Enumerable : false -- hasOwnProperty : false

$__set -- Enumerable : false -- hasOwnProperty : false

getValue -- Enumerable : false -- hasOwnProperty : false

setValue -- Enumerable : false -- hasOwnProperty : false

get -- Enumerable : false -- hasOwnProperty : false

$__path -- Enumerable : false -- hasOwnProperty : false

markModified -- Enumerable : false -- hasOwnProperty : false

modifiedPaths -- Enumerable : false -- hasOwnProperty : false

isModified -- Enumerable : false -- hasOwnProperty : false

isDirectModified -- Enumerable : false -- hasOwnProperty : false

isInit -- Enumerable : false -- hasOwnProperty : false

isSelected -- Enumerable : false -- hasOwnProperty : false

validate -- Enumerable : false -- hasOwnProperty : false

validateSync -- Enumerable : false -- hasOwnProperty : false

invalidate -- Enumerable : false -- hasOwnProperty : false

$markValid -- Enumerable : false -- hasOwnProperty : false

$isValid -- Enumerable : false -- hasOwnProperty : false

$__reset -- Enumerable : false -- hasOwnProperty : false

$__dirty -- Enumerable : false -- hasOwnProperty : false

$__setSchema -- Enumerable : false -- hasOwnProperty : false

$__getArrayPathsToValidate -- Enumerable : false -- hasOwnProperty : false

$__getAllSubdocs -- Enumerable : false -- hasOwnProperty : false

$__registerHooksFromSchema -- Enumerable : false -- hasOwnProperty : false

$__handleReject -- Enumerable : false -- hasOwnProperty : false

$toObject -- Enumerable : false -- hasOwnProperty : false

toObject -- Enumerable : false -- hasOwnProperty : false

toJSON -- Enumerable : false -- hasOwnProperty : false

inspect -- Enumerable : false -- hasOwnProperty : false

toString -- Enumerable : false -- hasOwnProperty : false

equals -- Enumerable : false -- hasOwnProperty : false

populate -- Enumerable : false -- hasOwnProperty : false

execPopulate -- Enumerable : false -- hasOwnProperty : false

populated -- Enumerable : false -- hasOwnProperty : false

$__fullPath -- Enumerable : false -- hasOwnProperty : false

      

        
        
        
      

    

In the end, I would like to go through media.audio

, but cannot figure out how.

It works by executing var audio = (JSON.parse(JSON.stringify(media.audio)));

and then iterating over it with for…in

, but I don't believe this is the correct way to do it!