public WOActionResults uploadSucceededAction() {
EOEditingContext workingEC = masterObject().editingContext();
ERAttachment existing = (ERAttachment)masterObject().valueForKey(relationshipKey());
if (existing != null) {
workingEC.deleteObject(existing.localInstanceIn(workingEC));
}
masterObject().addObjectToBothSidesOfRelationshipWithKey(newAttachment(), relationshipKey());
_showUpload = false;
return (WOActionResults)valueForBinding(Keys.uploadSucceededAction);