How to return id with Mongoose Aggregate Lookup with Apollo GraphQL - reactjs

Question

I have an aggregate function that returns people in a collection:
const getById = ({ id }) => {
return Project.aggregate([
{ $match: { _id: Types.ObjectId(id) } },
{
$lookup: {
from: "members",
localField: "_id",
foreignField: "project_id",
as: "members"
}
},
])
.then(data => {
const [project] = data;
console.log(project) // see below
return {
id: project._id,
...project
};
})
.catch(err => console.log(err));
}
If I return the data from this I get the following:
// Server response
{ _id: 5e2f57b577a8ce59c79e74af,
title: 'ok',
user_id: 5e2dc7961e6b840c315b5a03,
__v: 0,
members:
[ { _id: 5e447683b4f732cc9c4a9531,
name: 'Karl Taylor',
email: 'karl#queuey.dev',
project_id: 5e2f57b577a8ce59c79e74af,
position: 1,
__v: 0 },
{ _id: 5e45be128ed96a5eaef5d13e,
name: 'John Smith',
email: 'john#queuey.dev',
project_id: 5e2f57b577a8ce59c79e74af,
position: 2,
__v: 0 } ] }
However, when I query from the frontend using Apollo GraphQL, the id is null. (But it works on other items, as id is a getter for id but this does not happen on aggregate functions).
What is the best practice to map the id to the correct value? I would normally just use array.map but I feel like that might be overkill if I have too many members (at which point I would probably break this out to do pagination, but that's a different story.)
This is the response from frontend
// Client response
"project": {
"id": "5e2f57b577a8ce59c79e74af",
"title": "ok",
"members": [
{
"id": null, // <-- Notice here is null
"name": "Karl Taylor",
"email": "karl#queuey.dev",
"__typename": "Member"
},
{
"id": null, // <-- Notice here is null
"name": "John Smith",
"email": "john#queuey.dev",
"__typename": "Member"
}
],
"__typename": "Project"
}
This question here is similar, however, I do not believe it is a duplicate because we are querying different data. (the answer does not solve my question.)
I need to be able to return id otherwise cached redirects will not work.

Answer 1

I ran into this problem as well when I try to use aggregations.
simply you can you both ID's(id and _id) but it's not good thing.
what I use is to iterate the data
if the returning data of the query is not array use this
return {
...res._doc,
id: res._id,
}
but the returning data is an array you can add id to the response variable like below using forEach
res.forEach(element => {
element.id = element._id
});
return res;