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| author | Mike Bayer <mike_mp@zzzcomputing.com> | 2014-01-31 19:57:38 -0500 |
|---|---|---|
| committer | Mike Bayer <mike_mp@zzzcomputing.com> | 2014-01-31 19:57:38 -0500 |
| commit | 33c7cfff6eb1b8d93dee3b4a76f4cac38c772d77 (patch) | |
| tree | 9db95f480f5d7f1db1322c855f907bef6bf73e0e /lib/sqlalchemy/orm/base.py | |
| parent | 6b3ecd14eae1a557cffd19da6c82d967586a6d74 (diff) | |
| download | sqlalchemy-33c7cfff6eb1b8d93dee3b4a76f4cac38c772d77.tar.gz | |
- Added a new directive used within the scope of an attribute "set" operation
to disable autoflush, in the case that the attribute needs to lazy-load
the "old" value, as in when replacing one-to-one values or some
kinds of many-to-one. A flush at this point otherwise occurs
at the point that the attribute is None and can cause NULL violations.
[ticket:2921]
Diffstat (limited to 'lib/sqlalchemy/orm/base.py')
| -rw-r--r-- | lib/sqlalchemy/orm/base.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/base.py b/lib/sqlalchemy/orm/base.py index 577f9ff76..e973de897 100644 --- a/lib/sqlalchemy/orm/base.py +++ b/lib/sqlalchemy/orm/base.py @@ -80,6 +80,10 @@ LOAD_AGAINST_COMMITTED = util.symbol("LOAD_AGAINST_COMMITTED", """, canonical=32 ) +NO_AUTOFLUSH = util.symbol("NO_AUTOFLUSH", +"""loader callables should disable autoflush. +""", canonical=64) + # pre-packaged sets of flags used as inputs PASSIVE_OFF = util.symbol("PASSIVE_OFF", "Callables can be emitted in all cases.", |