[SERVER-10416] Using a dbref in a query nested in an "$in" gives "cannot next $ under $in" error - MongoDB Jira

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Operating System:
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Steps To Reproduce:

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Drop some dbrefs into a document and query against it using $in.

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Drop some dbrefs into a document and query against it using $in.

This query works in all 2.5.1 (unstable) and all stable builds:

db.roles.find({ "owner": {

	"$ref": "users",

	"$id": ObjectId("51fac2e08c0c23f6c3000046")

}});

This query does not work in 2.5.1 (unstable) but does work in all stable builds:

db.roles.find({ "owner": {

"$in": [

                "$ref": "roles",

                "$id": {

                    "$id": "51fac2de8c0c23f6c3000030"

},

                "$ref": "roles",

                "$id": {

                    "$id": "51fac2de8c0c23f6c3000031"

}});

Here is a sample document:

  "dateInserted": 1375388467,

  "dateUpdated": 1375388545,

  "owner": [

      "$ref": "users",

      "$id": ObjectId("51fac2e08c0c23f6c3000046")

],

  "name": "Search Manager",

  "key": "search-manager"

is duplicated by

SERVER-11552 $in queries with dbrefs are broken on 2.5.4