Problem Statement/Rationale

Enterprise [direct: mongos] testDB> db.testColl.insert({_id:Symbol("abc")})
{ acknowledged: true, insertedIds: { '0': Symbol(abc) } }

Enterprise [direct: mongos] testDB> db.testColl.find()
[ { _id: ObjectId("65734ad410242d79575e87ba") } ]

The above should have either used the ID that I gave, failed the insertion if that ID is unusable, or at least warned that it’s substituting an empty ID. It shouldn’t just quietly do something radically different from what I asked.

Seen in mongosh 1.10.3.

Steps to Reproduce

Retry the above.

Expected Results

The above should have either used the _id that I gave, or failed the insertion if (as seems to be the case) that ID can’t be represented in BSON.

Actual Results

The document inserted has the ID shown above.

Additional Notes

Enterprise [direct: mongos] test> EJSON.serialize({_id:Symbol("abc")})
{}

^^ This may relate to the problem.

AC

• Add an else case to catch any type we do not explicitly support in the BSON serializer