Eventing on same bucket document

Eventing
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#1

how to remove any field from document using eventing on same source bucket.

My task is to remove specific field form all documents in a bucket. (Note: direct N1QL query is not useful as it is taking a lot of time. So thought of eventing but unable to get any solution)

#2

Hi Nitesh,

You will need Couchbase 6.5 or later to do this. Let’s say you want to remove field “remove_this” from documents in bucket named “my_bucket”. Here’s how you’d configure the eventing handler:

Source Bucket:
Set source bucket to the bucket of interest, my_bucket

Bindings:
Define this alias in function settings to allow the function to write to the bucket:
AliasName = bkt, Bucket = my_bucket, Access = Read+Write

Function:

function OnUpdate(doc, meta) {
  if (doc.removethis) {
    delete doc.removethis; // remove the field
    bkt[meta.id] = doc; // write it back to the bucket
  }
}

If you wish to speed it up, you can add more eventing nodes to the cluster.

Best Regards,
Siri

#3

Thanks for letting me know that source bucket mutation does not work in CB <6.5 eventings.