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Function: Advanced Sub-Document LOOKUPIN Operation

    March 9, 2025
    + 12

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

    The advancedLookupInField function:

    • Demonstrates the CAS-free Sub-Document LOOKUPIN 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 lookupinfield:

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

    javascript
    Copy
    // Configure the settings for the advancedLookupInField 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, xattrs) {
  if (meta.id.startsWith("lookupinfield:") === false) return;

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

  res =
    couchbase.lookupIn(src_col, meta, [
      couchbase.LookupInSpec.get("<doc_path_0>", {"xattrs": false}),
      couchbase.LookupInSpec.get("<doc_path_1>")
    ]);
  log(opcnt++,res);
}