def get(self, id, pk='id', deleted=False):
        try:
            if pk == 'id':
                id = int(id)
            if deleted:
                spec = {pk: id}
            else:
                spec = {pk: id, 'data': {'$exists': 1}}
            fields = {'_id': 0}
            row = self.db.docs.find_one(spec, fields)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return Document(**row)
        raise NotFoundError('%s %s not found' % (pk, id))
def _globpatsplit(pat):
    """Split a glob pattern. Return a list.

    A naive version is "path.split("/")". This function handles more cases, like
    "{*,{a,b}*/*}".

    >>> _globpatsplit("*/**/x/{a,b/c}")
    ['*', '**', 'x', '{a,b/c}']
    """
    result = []
    buf = ""
    parentheses = 0
    for ch in pat:
        if ch == "{":
            parentheses += 1
        elif ch == "}":
            parentheses -= 1
        if parentheses == 0 and ch == "/":
            if buf:
                result.append(buf)
                buf = ""
        else:
            buf += ch
    if buf:
        result.append(buf)
    return result