How to query nested objects?

Question

I have a problem when querying mongoDB with nested objects notation:

db.messages.find( { headers : { From: \"reservations@marriott.com\" } } ).count()
0
db.m         


        

Answer 1

db.messages.find( { headers : { From: "reservations@marriott.com" } } )

This queries for documents where headers equals { From: ... }, i.e. contains no other fields.

---

db.messages.find( { 'headers.From': "reservations@marriott.com" } )

This only looks at the headers.From field, not affected by other fields contained in, or missing from, headers.

---

Dot-notation docs