Mongo ObjectIDs not equal to eachother

Question

new Mongo.ObjectID('18986769bd5eaaa42cb565b1') == new Mongo.ObjectID('18986769bd5eaaa42cb565b1')

returns false

new Mongo.ObjectID('18986769bd5eaaa42cb565b1').toString() == new Mongo.ObjectID('18986769bd5eaaa42cb565b1').toString()

returns true

Is this a bug, a feature or do I need to only work with these using valueOf() and convert it back from string when I need to work with the database?

Mangosteen

Two separate JavaScript objects are never == to each other. – Boustrophedon

You should take a look at this question, it might solve yours #11637853 Basically they say that you need to use the equals method provided by the mongo library you are using – Philadelphia

@Roger, please add your comment as an answer so I can accept it. – Mangosteen

@TylerClendenin Done! – Philadelphia

Answer 1

You should take a look at this question, it might solve yours. Basically, they say that you need to use the equals method provided by the mongo library you are using

Philadelphia

Answer 2

This is completely normal as two objects are not equal to each other even if they contain the same information. You need to loop through all the properties and compare them individually.

console.log({} === {});

example

const obj1 = {id: 12345}
const obj2 = {id: 12345}

console.log(obj1 === obj2);

let same = true;
for(const prop in obj1){
  if(obj2.hasOwnProperty(prop) && obj1[prop] !== obj2[prop]){
      same = false;
      break;
  }
}

console.log(same);

Philan

Answer 3

It's because MongoDB is entirely based around JSON, so even if a particular piece of information is itself a string, Mongo still delivers it as a JSON object. Therefore, you need to parse it back into string form so that you can use it somewhere else.

Cursory

Answer 4

ObjectId("507c7f79bcf86cd7994f6c0e").valueOf() === "507c7f79bcf86cd7994f6c0e" //true

ObjectId("507c7f79bcf86cd7994f6c0e") === "507c7f79bcf86cd7994f6c0e" //false

ObjectId("507c7f79bcf86cd7994f6c0e").valueOf() === ObjectId("507c7f79bcf86cd7994f6c0e").valueOf() //true

Ashanti