Just trying to figure out some questions.
context: randomFunction is a function that takes 2 arguments(id & metaData). It is a called inside a controller . The code is given below:
await randomFunction(id, doc);
doc contains a object (basically a document in mongodb). suppose doc contains the following:
{
_id: "123456789012345678901234",
age: 30,
name: 'Lorem Ipsum',
gender: 'male'
}
Now , in the operations file where the randomFunction is initialized.
const randomFunction = async (id, metaData) => {
console.log(metaData) // prints metaData
delete metaData._id
console.log(metaData) // still prints metaData without deleting _id property
//code below
}
context: I wanted to delete the _id property of MetaData to pass it to the findOneAndUpdate() function in mongooose. But I was not able to succeed in deleting _id property. So I created the data object and passed it.
const randomFunction = async (id, metaData) => {
const data = {
name: metaData.name,
age: metaData.age,
gender: metaData.gender
}
//code below
}
It worked.
I then tested and console logged a few things.
const randomFunction = async (id, metaData) => {
console.log(metaData) // prints metaData
delete metaData._id
console.log(metaData) // still prints metaData without deleting _id property
const data = {
_id: metaData._id,
name: metaData.name,
age: metaData.age,
gender: metaData.gender
}
console.log(data) // prints data object
delete data._id
console.log(data) // prints data with deleting _id property
//code below
}
So , What is the reason I was not able to delete _id in MetaData but able to able _id in Data.
When I was trying to reproduce the same thing in javascript console(chrome), I was not able to reproduce. (it is deleting the properties from arguments also.).
