Partial indexes in mongodb / mongoose

Question

In the sparse index documentation I found note about mongodb 3.2 partial indexes

Changed in version 3.2: Starting in MongoDB 3.2, MongoDB provides the option to create partial indexes. Partial indexes offer a superset of the functionality of sparse indexes. If you are using MongoDB 3.2 or later, partial indexes should be preferred over sparse indexes.

Partial indexes are very helpfull and I want to use them in my project. Is it possible use them with mongoose?

Answer 1

In the current Mongoose version 4.3.7 you cannot define partial indexes in the scheme, but you can still use Partial Indexes of MongoDB 3.2.

You just have to create the indexes using the native driver.

// ScheduleModel is a Mongoose Model
ScheduleModel.collection.createIndex({"type" : 1 } , {background:true , partialFilterExpression : { type :"g" }} , function(err , result){
     console.log(err , result);
});

After that, every query that matches the partialFilterExpression will be indexed.

Answer 2

Now it's possible natively with Mongoose +4.6.1

Book.index({user: 1, author: 1, complete: 1}, {unique: true, partialFilterExpression: {complete: true}});

Answer 3

For Mongoid users:

index(
  { user_id: 1, author_id: 1, complete: 1 },
  background: true,
  partial_filter_expression:
    {
      complete: { :$eq => true }
    }
)

Couldn't find any docs, but this PR.