/**
  * Find the identifying string to effectively represent a record in the activity log.
  * @param  array $schemaArray
  * @param  array|AclAwareRowGateway $fulRecordData
  * @return string
  */
 public function findRecordIdentifier($schemaArray, $fullRecordData)
 {
     // Decide on the correct column name
     $identifierColumnName = null;
     $column = TableSchema::getFirstNonSystemColumn($schemaArray);
     if ($column) {
         $identifierColumnName = $column['column_name'];
     }
     // Yield the column contents
     $identifier = null;
     if (isset($fullRecordData[$identifierColumnName])) {
         $identifier = $fullRecordData[$identifierColumnName];
     }
     return $identifier;
 }