Why Mongoose cant create an index in MongoDB Atlas? - mongodb

Question

I have a Mongoose Schema which contains a field with a certain index:
const reportSchema = new mongoose.Schema({
coords: {
type: [Number],
required: true,
index: '2dsphere'
},
…
}
It works well on my local machine, so when I connect to MongoDB through the shell I get this output for db.reports.getIndexes():
[
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "weatherApp.reports"
},
{
"v" : 2,
"key" : {
"coords" : "2dsphere"
},
"name" : "coords_2dsphere",
"ns" : "weatherApp.reports",
"background" : true,
"2dsphereIndexVersion" : 3
}
]
Then I deploy this app to Heroku and connect to MongoDB Atlas instead of my local database. It works well for saving and retrieving data, but did not create indexes (only default one):
[
{
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "weatherApp.reports"
}
]
What may cause this problem? Atlas allow to create indexes through Web GUI and it works good as well as creating indexes form the shell. But Mongoose fails this operation for some reason.

Answer 1

I had the same issue when I was on mongoose version v5.0.16. However, since I updated to v5.3.6 it is now creating the (compound) indexes for me on Mongo Atlas. (I just wrote a sample app with both versions to verify this is the case).
I'm not sure which version fixed this issue, but it's somewhere between v5.0.16 and v5.3.6, where v5.3.6 is working.