private Stream<Column> columnsFromPks() {
        return primaryKeyColumns().map(pk -> {
            try {
                return pk.findColumnOrThrow();
            } catch (final NoSuchElementException ex) {
                throw new SpeedmentTranslatorException(
                    "Could not find any column belonging to primary key '" + pk.getId() + "'.", ex
                );
            }
        });
    }
@author pemi
@param <T> type of model to translate into
generator-parent/generator-translator/src/main/java/com/speedment/generator/translator/AbstractEntityAndManagerTranslator.java