Fix: Clear sheet info when updating existing Preview

amphibian-server/src/main/java/org/genesys/amphibian/service/impl/MetadataServiceImpl.java

@@ -85,8 +85,10 @@ public class MetadataServiceImpl implements MetadataService {
 		Preview preview = previewService.getPreview(referenceUuid);
 		if (preview == null) {
 			preview = new Preview();
+		} else {
+			LOG.warn("Preview with UUID={} already exists. Content will be updated.", referenceUuid);
+			preview.getSheets().clear(); // remove existing sheets
 		}
-		LOG.warn("Preview with UUID={} already exists. Content will be updated.", referenceUuid);
 		preview.setName(csvFile.getOriginalFilename());
 		preview.setReferenceUuid(referenceUuid);
 
@@ -173,6 +175,9 @@ public class MetadataServiceImpl implements MetadataService {
 		Preview preview = previewService.getPreview(referenceUuid);
 		if (preview == null) {
 			preview = new Preview();
+		} else {
+			LOG.warn("Preview with UUID={} already exists. Content will be updated.", referenceUuid);
+			preview.getSheets().clear(); // remove existing sheets
 		}
 		preview.setName(excelFile.getOriginalFilename());
 		preview.setReferenceUuid(referenceUuid);

[Matija Obreza]

@mborodenko @vpavlov Sheets were appended with every update of the file. This fix is now in main amphibian branch (for the Dataset validation).