public function getFieldForColumn($columnName)
    {
        if (isset($this->fieldNames[$columnName])) {
            return $this->fieldNames[$columnName];
        } else {
            foreach ($this->associationMappings as $assocName => $mapping) {
                if ($this->isAssociationWithSingleJoinColumn($assocName) &&
                    $this->associationMappings[$assocName]['joinColumns'][0]['name'] == $columnName) {

                    return $assocName;
                }
            }

            throw MappingException::noFieldNameFoundForColumn($this->name, $columnName);
        }
    }