db.users.find();
Will return me an array of users:
[{
_id: 123
name: bob
},{
_id: 456
name: tom
}]
I need to map users to another collection by the id, so I would like to get an object back from mongo where the keys are _id and values are the user doc.
i.e.
users = {
123: {_id: 123, name: bob},
456: {_id, 456, name:tom}
}
Then I can access users directly from that object without having to iterate an array to find specific users.
id = 123;
user = users[id];
You can't get an object like this one from mongodb, but it's quite easy to build it yourself:
db.users.find(function (err, docs) {
var users = {};
docs.forEach(function (doc) {
users[doc._id] = doc;
});
do_whatever_you_want_next(users);
});
Posting my solution in a more modern syntax:
const pushSubscriptions = await PushSubscription.find({ token: { $in: tokens } }).exec();
const userTokens = pushSubscriptions.reduce(
(result, ps) => {
result[ps.token] = ps;
return result;
},
{});
