@Override
public ColumnSnapshot findByNameAndBoardId(String name, long boardId) {
Column column = columnRepository.findByBoardIdAndName(boardId, name);
return column == null ? null : column.toSnapshot();
}
@Override
public ColumnSnapshot findById(long columnId) {
Column column = columnRepository.findOne(columnId);
return column == null ? null : column.toSnapshot();
}