CODEWITHSUNDEEP
javascriptnode.jsmongodb
tune2fs
tune2fs

Reputation: 7705

console.log not showing expected object properties

I have the following code in javascript in my node.js application. However certain objects are not stored in my variable appointment. Even if I set them, when I directly access them it works: console.log(appointment.test);

What have I done wrong in this code?

var appointment = {
    subscribed: false,
    enoughAssis: false,
    studentSlotsOpen: false
};
console.log(appointment);
for (var key in appointmentsDB[i]) {
    appointment[key] = appointmentsDB[i][key];    
}

appointment.test= "res";

console.log(appointment.test);
console.log(appointment);

And here is the produced output:

{ subscribed: false,
  enoughAssis: false,
  studentSlotsOpen: false }
res
{ comment: 'fsadsf',
  room: 'dqfa',
  reqAssi: 3,
  maxStud: 20,
  timeSlot: 8,
  week: 31,
  year: 2013,
  day: 3,
  _id: 51f957e1200cb0803f000001,
  students: [],
  assis: [] }

The variable console.log(appointmentsDB[i]) looks as:

{ comment: 'fsadsf',
  room: 'dqfa',
  reqAssi: 3,
  maxStud: 20,
  timeSlot: 8,
  week: 31,
  year: 2013,
  day: 3,
  _id: 51f957e1200cb0803f000001,
  students: [],
  assis: [] }

The following command:

console.log(Object.getOwnPropertyNames(appointmentsDB[i]), Object.getOwnPropertyNames(Object.getPrototypeOf(appointmentsDB[i])));

Shows:

[ '_activePaths',
  '_events',
  'errors',
  '_maxListeners',
  '_selected',
  '_saveError',
  '_posts',
  'save',
  '_pres',
  '_validationError',
  '_strictMode',
  'isNew',
  '_doc',
  '_shardval' ] [ 'assis',
  'timeSlot',
  'db',
  '_schema',
  'id',
  'base',
  'day',
  'collection',
  'reqAssi',
  'constructor',
  'comment',
  'year',
  'room',
  'students',
  'week',
  '_id',
  'maxStud' ]

However I would expect that my last output also provides the entries test, subscribed, enoughAssis and studentSlotsOpen. What is wrong in this code?

The solution I found was to manually copy the elements I wanted to.

Upvotes: 4

Views: 2867

Answers (1)

Bergi
Bergi

Reputation: 664484

You probably have a Document object instead of a plain object. Those have a custom toJSON method which only yields the properties of your schema and the _id, but nothing else. If you are copying that method with your for-in-loop onto the appointment object, it will get serialized differently as well when logged.

Try

for (var key in appointmentsDB[i].toObject()) {
    appointment[key] = appointmentsDB[i][key];    
}

appointment.test= "res";

console.log(appointment);

Upvotes: 5

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