Mongoose Indexing
The _id field is created automatically for every document created. You can not change its name or remove it.
employeesSchema will has 2 primary keys:
- employee._id
- employee.employeeId
that is why you see two index in your mongoose
Edit:
After create model, we must wait for index event before create document
User = mongoose.model('users', UserSchema);User.on('index', function () { new User({}).save(); new User({}).save(); new User({}).save(); new User({}).save();})If you do not wait for index event, the index may not be created (and you will not see any warning from mongoose about it)
I have report this to mongoose and get reply on this issue:https://github.com/LearnBoost/mongoose/issues/1745