Znalezienie według właściwości podrzędnej obiektu w Mongo
db.messages.find( { headers : { From: "[email protected]" } } )
This queries for documents where headers equals { From: ... }, i.e. contains no other fields.
db.messages.find( { 'headers.From': "[email protected]" } )
This only looks at the headers.From field, not affected by other fields contained in, or missing from, headers.
Itchy Ibis