How to see the converted query by MongoDB shell

> db.foo.remove()
> db.foo.insert( { foo : "bar" } )
> var cursor = db.foo.find( {开发者_运维问答 foo : "bar" } ).sort({x : 1})
> cursor.hasNext()
true
> cursor.next()
{ "_id" : ObjectId("4e8ddace03998dbf81966015"), "foo" : "bar" }
> db.foo.find({ $query : {foo : "bar"}, $orderby : { x : 1}})
{ "_id" : ObjectId("4e8ddace03998dbf81966015"), "foo" : "bar" }
> 

The following query:

var cursor = db.foo.find( { foo : "bar" } ).sort({x : 1})

has been converted to the following statement by the shell:

db.foo.find({ $query : {foo : "bar"}, $orderby : { x : 1}})

Question: Is there a way that I could see the converted query by the shell? In other words, given a query, can I see the converted form of query by the shell?

You can't see the exact query from the shell, but you can see exactly what the helper functions (sort, size, etc) do. Leaving off the parens will output what the JS query will execute:

> db.foo.find
function (query, fields, limit, skip) {
    return new DBQuery(this._mongo, this._db, this, this._fullName, this._massageObject(query), fields, limit, skip);
}
> db.foo.find().sort
function (sortBy) {
    return this._addSpecial("orderby", sortBy);
}

As you can see, all that sort does is add the orderby operator.