为什么在Mongoose文档上看不到所有JS对象属性？

Question

I'm writing a route in Express (Node.js) in which i pull some data from mongoose. Let's say that at some some point I need to compare if employee._id is in array of bad employees id::

let employees = await EmployeeModel.find().exec();
employees.forEach(function (employee) {
    if (arrayOfBadEmployees.indexOf(employee._id) !== -1) {
        employee.isBad = true;
    }
});
console.log(employees);
console.log(employees[0].isBad);

and here's my output:

[ { __v: 0, name: 'Employee X', _id: 1 },
  { __v: 0, name: 'Employee Y', _id: 3 },
  { __v: 0, name: 'Employee Z', _id: 5 } ]
true

So when I can't see 'isBad' property when I console.log the whole array/object, but this property is still there? When i check with propertyIsEnumerable('isBad') it says true.

Answer 1

Mongoose, by default, returns an instance of MongooseDocument , which doesn't expose your data directly and adds convenience methods like populate or save

You can use the lean option to get raw objects instead.

MongooseDocument also exposes a toObject function if you need to get editable documents.