best way to do bulk insert/replace?

[Arek Czechowski]

I want to insert multiple documents into mongo, as fast as possible, and each document will have unique _id given by me

If _id is already used I want this document to be replaced with new version - no updates. 

if there isnt a doc with same _id - I want just plain insert

Is there any trick/option to make bulk insert work this way?

[Tyler Brock]

You are going to want to do an upsert with replacement like this:

Bulk.find(<query>).upsert().replaceOne(<replacement>);

You can read more about that here:

http://docs.mongodb.org/manual/reference/method/Bulk.find.upsert/#Bulk.find.upsert

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