In Mongo, Increment and return value -- possible in 1 call?

Question

In Mongo, is it possible to increase and get the result of the increment?

collection.update({id: doc_id}, {$inc: {view_count: 1}});

I tried to output the result of that statement (in node) and I got the following:

 { _id: 1,
  _state: undefined,
  _result: undefined,
  _subscribers: [] }

Answer 1

You can use findAndModify. Add the new:true option.

According to the docs:

The findAndModify command modifies and returns a single document. By default, the returned document does not include the modifications made on the update. To return the document with the modifications made on the update, use the new option.

You could do the following:

db.collection.findAndModify(
    query:  {_id: doc_id},
    update: { $inc: { view_count :1 } },
    new: true,
)