Sorting and Mongoose.js findOneAndRemove

Question

According to the Mongoose.js docs, it should be possible to add a sort directive to methods passed directly to the database like findOneAndUpdate or findOneAndRemove .

I'm trying to grab a single document that matches a criterion and remove it from the database. So far, I have tried:

Model.findOneAndRemove({foo: 'bar'})
    .sort({created_at: 'asc'})
    .exec(callback);

and

Model.findOneAndRemove({foo: 'bar'}, {sort: {created_at: 'asc'}}).exec(callback);

Both of which seem to ignore the sort instruction and simply find and remove the most recently added matching document, not the document with the earliest created_at date.

Issuing the query as a findOne and then removing the document in the callback function works as expected, eg,

Model.findOne({foo: 'bar'}).sort({created_at: 'asc'})
    .exec(function (err, doc) { 
        doc.remove(); 
    });

returns and removes the document with the earliest created_at date, so I believe that sorting in findOneAndRemove queries (which, unlike regular queries, are handed directly to MongoDB) must use a different syntax.

Using findOne instead of findOneAndRemove is a viable option, but I would prefer that the operation be atomic if at all possible.

Is it possible to use sort directives with Mongoose.js queries like findOneAndUpdate or findOneAndRemove , and, if so, what syntax is used?

Answer 1

Maybe it will help to change the condition of the sort to:

    {created_at: 1}

'or'

    {created_at: -1}

(for ascending or descending respectively). Im currently struggling with the findOneAndRemove wrapper as well. It does not seem to work flawlessly.

Answer 2

Based on the API Documentation here this appears to be fixed in v3.8.18 of mongoose.js .

It very likely was fixed earlier, but that's the version I'm using.

Answer 3

Model.findOneAndRemove({foo: 'bar'}, {sort: {created_at: -1}}, (err, doc) => {

})