Mongo.BulkOps.get_replace_one

You're seeing just the function get_replace_one, go back to Mongo.BulkOps module for more information.
Link to this function

get_replace_one(filter, replacement, opts \\ [])

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Specs

get_replace_one(BSON.document(), BSON.document(), Keyword.t()) :: bulk_op()

Returns an replace_one operation for appending to a bulk. Used to perform stream bulk writes.

Example

Mongo.BulkOps.get_replace_one(%{name: "Waldo"}, %{name: "Greta", kind: "dog"})

{:update, {%{name: "Waldo"}, %{kind: "dog", name: "Greta"}, [multi: false]}}