[mongodb-user] Why is denormalized data nested in mongodb?

[Samuel Chow]

So I've been doing some research on creating the correct data model for my
application.

Something I noticed in examples has been that when data is denormalized it
is usually nested in the data record.

Example:

{ // Build Info
_id : ObjectID("M"),
date : "2018-12-07",
buildVersion : "0.1.0.0"
}

{ // Test Data
_id : ObjectID("A"),
buildRef : {
_id : ObjectID("M"),
buildVersion : "0.1.0.0"
},
data1 : 1.0
data2 : 2.0
}

buildRef key is used contains another key/pair.

I was thinking if I was to search Test Data using a Build Info
ObjectID("M") wouldn't querying be inefficient since mongodb needs to go
one layer deeper into the nested record?

Could this be a bit more efficient?

{
_id : ObjectID("A"),
buildRef_id : ObjectID("M"),
buildRefBuildVersion : "0.1.0.0",
data1 : 1.0
data2 : 2.0
}

I'm sure there is a reason the examples are written this way. Maybe mongodb
doesn't care and its just as efficient. Any enlightenment would be great.
Thanks!
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