mongodb - How to use dot in field name?

Question

How to use dot in field name ?

I see error in example:

db.test2.insert({ "a.a" : "b" })

can't have . in field names [a.a]

Answer 1

You can replace dot symbols of your field name to Unicode equivalent of uff0E

db.test.insert({"fielduff0ename": "test"})
db.test.find({"fielduff0ename": "test"}).forEach(printjson)
{ "_id" : ObjectId("5193c053e1cc0fd8a5ea413d"), "field．name" : "test" }

See more:

1. http://docs.mongodb.org/manual/faq/developers/#faq-dollar-sign-escaping
2. http://docs.mongodb.org/manual/core/document/#dot-notation