How to properly do a Bulk upsert/update in MongoDB

Question

I\'m trying to:

• Find a document according to a search criteria,
• If found, update some attributes
• If not insert a document with some attribut

Answer 1

I recommend use bulkWrite exemplary code with bulk upsert of many documents:

In this case you will create documents with unique md5. If document exists then will be updated but no new document is created like in classical insertMany.

const collection = context.services.get("mongodb-atlas").db("master").collection("fb_posts");

return collection.bulkWrite(
  posts.map(p => { 
    return { updateOne:
      {
        filter: { md5: p.md5 },
        update: {$set: p},
        upsert : true
      }
    }
  }
  ),
  { ordered : false }
);

https://docs.mongodb.com/manual/reference/method/db.collection.bulkWrite/