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CRUD-operations $set operator syntax
CRUD-operations $set operator https://github.com/leojavier/MongoDb-cheat-sheet/blob/master/1.0%20CRUD-operations.md#set-operator
it seems that the syntax is diff from manual from mongodb.com https://docs.mongodb.com/manual/tutorial/update-documents/#update-documents-in-a-collection
{
<update operator>: { <field1>: <value1>, ... },
<update operator>: { <field2>: <value2>, ... },
...
}
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