toUpper(lsr.isrc) WITH toUpper(lsr.isrc) AS isrc, lsr.vendorId as vendorId, lsr.subaccountId as subaccountId, collect(lsr) as lsrs // Find or create a normalized ISRC node, and add it to the list MERGE (lsr:LabelSoundRecording { isrc: isrc, vendorId: vendorId, subaccountId: subaccountId }) WITH isrc, vendorId, subaccountId, lsrs + [lsr] as lsrs // Lock all the nodes so that new participations cannot be attached before this TX finishes. CALL apoc.lock.nodes(lsrs) // Filter out any cases where we have multiple nodes with participations as they cannot be directly merged. WITH isrc, vendorId, subaccountId, lsrs WHERE reduce(participations = 0, lsr IN lsrs | CASE WHEN exists((lsr)-[:ON_LABEL_SOUND_RECORDING]-(:LabelSoundRecordingParticipation)) THEN 1 ELSE 0 END + participations) <= 1 // Merge together LSRs CALL apoc.refactor.mergeNodes( lsrs, { properties: "discard", mergeRels: true } ) YIELD node // Finally, make sure that we end up with the normalized ISRC on the node SET node.isrc = isrc; ]]>