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Function: Advanced Sub-Document MUTATEIN Operation

    March 23, 2025
    + 12

    Perform the Advanced Sub-Document MUTATEIN operation on a field where Eventing interacts with the Data Service.

    The advancedMutateInField function:

    • Demonstrates the CAS-free Sub-Document MUTATEIN operation on a document field

    • Requires Eventing Storage (or a metadata collection) and a source collection

    • Requires a binding of type bucket alias

    • Operates on any mutation where the meta.id or KEY starts with mutateinfield:

    For more information about the Advanced Sub-Document MUTATEIN operation , see Sub-Document MUTATEIN Operation.

    javascript
    Copy
    // Configure the settings for the advancedMutateInField function as follows:
//
// Version 7.6+
//   "Function Scope"
//     *.* (or try bulk.data if non-privileged)
//   "Listen to Location"
//     bulk.data.source
//   "Eventing Storage"
//     rr100.eventing.metadata
//   Binding(s)
//    1. "binding type", "alias name...", "bucket.scope.collection", "Access"
//       "bucket alias", "src_col",       "bulk.data.source",        "read and write"

function OnUpdate(doc, meta) {
  if (meta.id.startsWith("mutateinfield:") === false) return;

  var meta = { "id": meta.id };
  var res;
  var opcnt = 1;

  res =
    couchbase.mutateIn(src_col, meta, [
      couchbase.MutateInSpec.insert("testField", "insert")
    ]);
  log(opcnt++,res);

  res =
    couchbase.mutateIn(src_col, meta, [
      couchbase.MutateInSpec.replace("testField", "replace")
    ]);
  log(opcnt++,res);

  res =
    couchbase.mutateIn(src_col, meta, [
      couchbase.MutateInSpec.remove("testField")
    ]);
  log(opcnt++,res);
}