[FIXED] How to query nested objects?

Issue

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

db.messages.find( { headers : { From: "reservations@marriott.com" } } ).count()
0
db.messages.find( { 'headers.From': "reservations@marriott.com" }  ).count()
5

I can't see what I am doing wrong. I am expecting nested object notation to return the same result as the dot notation query. Where am I wrong?

Solution

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

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

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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.

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Dot-notation docs

Answered By - shx2

Answer Checked By - David Marino (PHPFixing Volunteer)