Mongoose update or create many values in one query - node.js

Question

I have a document like this:
{
"_id" : ObjectId("565e906bc2209d91c4357b59"),
"userEmail" : "abc#example.com",
"subscription" : {
"project1" : {
"subscribed" : false
},
"project2" : {
"subscribed" : true
},
"project3" : {
"subscribed" : false
},
"project4" : {
"subscribed" : false
}
}
}
I'm using express to for my post web service call like this:
router.post('/subscribe', function(req, res, next) {
MyModel.findOneAndUpdate(
{
userEmail: req.body.userEmail
},
{
// stuck here on update query
},
{
upsert: true
}, function(err, raw) {
if (err) return handleError(err);
res.json({result: raw});
}
)
});
My req contains data like this:
{
userEmail: "abc#example.com",
subscription: ["project1", "project4"]
}
So these are the steps I would like to perform on this call:
Check user exists, otherwise create the user. For instance, if abc#example.com doesn't exist, create a new document with userEmail as abc#example.com.
If user exists, check project1 and project4 exists in subscription object. If not create those.
If project1 and project4 exists in subscription, then update the subscribed to true.
I'm not sure whether I can achieve all the above 3 steps with a single query. Kindly advise.

Answer 1

Vimalraj,
You can accomplish this using $set. The $set operator replaces the value of a field with the specified value. According to the docs:
If the field does not exist, $set will add a new field with the specified value, provided that the new field does not violate a type constraint. If you specify a dotted path for a non-existent field, $set will create the embedded documents as needed to fulfill the dotted path to the field.
Since your req.subscription will be an array you'll have to build your query. to look like this:
{
$set: {
"subscription.project1":{"subscribed" : true},
"subscription.project4":{"subscribed" : true}
}
You can use reduce to create an object from req.subscription = ["project1","project4"] array
var subscription= req.subscription.reduce(function(o,v){
o["subscription." + v] = {subscription:true};
return o;
},{});
Then your code becomes:
router.post('/subscribe', function(req, res, next) {
var subscription= req.subscription.reduce(function(o,v){
o["subscription." + v] = {subscription:true};
return o;
},{});
MyModel.findOneAndUpdate(
{
userEmail: req.body.userEmail
},
{
$set: subscription
},
{
upsert: true
}, function(err, raw) {
if (err) return handleError(err);
res.json({result: raw});
}
)
});