[SERVER-7150] update() able to create fields which begin with '$' - MongoDB Jira

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> db.test.insert({"_id" : 123456, "$push" : "foo"})

Tue Sep 25 08:53:46 uncaught exception: field names cannot start with $ [$push]

> db.test.insert({"_id" : 123456})

> db.test.find()

{ "_id" : 123456 }

> db.test.update({"_id" : 123456}, {"$set" : { "$push" : "foo" }})

> db.test.find()

{ "$push" : "foo", "_id" : 123456 }

> db.test.update({}, {"$rename" : {"$push" : "$"}})

> db.test.find()

{ "$" : "foo", "_id" : 123456 }

> db.test.update({}, {"$rename" : "$" : "$$$"}})

> db.test.find()

{ "$$$" : "foo", "_id" : 123456 }

It seems like the same field name validation rules should be enforced on updates for any modifiers.

is depended on by

SERVER-6833 Secondary crashes when replicating a document that the primary accepted (with a field name containing a "$")

is related to

SERVER-6399 Refactor update() code

related to

SERVER-14244 Additional tests for setting fields with $ names