db.py 文件源码

def value_set(self, colname, key, filter=None,
                  sort=True, flat=False, **kwargs):
        """Return a set of all values in a key"""
        if filter is not None:
            data = self.get_collection(colname).find(filter, **kwargs)
        else:
            data = self.get_collection(colname).find(**kwargs)

        values = [item.get(key) for item in data if item.get(key) is not None]

        if flat is True:
            values = list(itertools.chain(*values))

        with suppress(TypeError):
            values = list(set(values))

        return sorted(values) if sort is True else values