Use sha1 to generate index IDs.

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This commit is contained in:
Friedrich Lindenberg 2015-06-11 11:54:04 +02:00
parent 1df4b281f9
commit 61b33d9d4f
1 changed files with 13 additions and 2 deletions
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15
dataset/persistence/table.py
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@ -1,5 +1,6 @@
import logging import logging
from itertools import count from itertools import count
from hashlib import sha1
from sqlalchemy.sql import and_, expression from sqlalchemy.sql import and_, expression
from sqlalchemy.schema import Column, Index from sqlalchemy.schema import Column, Index
@ -272,8 +273,18 @@ class Table(object):
""" """
self._check_dropped() self._check_dropped()
if not name: if not name:
sig = abs(hash('||'.join(columns))) sig = '||'.join(columns)
name = 'ix_%s_%s' % (self.table.name, sig)
# This is a work-around for a bug in <=0.6.1 which would create
# indexes based on hash() rather than a proper hash.
key = abs(hash(sig))
name = 'ix_%s_%s' % (self.table.name, key)
if name in self.indexes:
return self.indexes[name]
key = sha1(sig.encode('utf-8')).hexdigest()[:16]
name = 'ix_%s_%s' % (self.table.name, key)
if name in self.indexes: if name in self.indexes:
return self.indexes[name] return self.indexes[name]
try: try: