Why do clustered_index has an option at all?

[midnight-wonderer]

Hey,
I am interested in clustered collections for key-value use cases; BTW, I came from Mongoid.

In Mongoid's document (+ some info on this repo), I can specify

store_in collection_options: {
  clustered_index: {
    key: { _id: 1 },
    unique: true,
  }
}

in my model; I supposed.

Which is weird because

{
  key: { _id: 1 },
  unique: true,
}

is the only possible value; they can't be anything else.

Why do we have options for key and unique at all?

[alexbevi]

Hey @midnight-wonderer,

Why do we have options for key and unique at all?

Just to clarify, the clustered_index document is an option passed to the create command to indicate to the MongoDB Server a Clustered Collection is being created.

Though no other values for key and unique are presently supported, the Driver's API is being designed to support future changes to the Server's command options.