mongodb unwind
{
$unwind:
{
path: <field path>,
includeArrayIndex: <string>,
// to include documents whose sizes field is null, missing, or an empty array.
preserveNullAndEmptyArrays: <boolean>
}
}mongodb unwind
{
$unwind:
{
path: <field path>,
includeArrayIndex: <string>,
// to include documents whose sizes field is null, missing, or an empty array.
preserveNullAndEmptyArrays: <boolean>
}
}Unwind Mongodb
db.vehicledetails.aggregate([{$unwind : {path: "$model_year", preserveNullAndEmptyArrays: true}}]).pretty()Copyright © 2021 Codeinu
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