'Mapping from view column --> _view_of object. Must be complement to
_obj_to_column().'

@classmethod
def _column_to_obj(cls, columns):

    (columns, is_single) = tup(columns, ret_is_single=True)
    ids = [column.keys()[0] for column in columns]
    if (len(ids) == 1):
        ids = ids[0]
    return cls._view_of._byID(ids, return_dict=False)
