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| author | Mike Bayer <mike_mp@zzzcomputing.com> | 2020-08-01 15:05:53 -0400 |
|---|---|---|
| committer | Mike Bayer <mike_mp@zzzcomputing.com> | 2020-08-01 19:41:04 -0400 |
| commit | 14fdd6260a578488bdad95b738ea6af5c2fcd13c (patch) | |
| tree | 4801e916ea7e2008857dae0be86898d8adadfd1c /lib/sqlalchemy/orm/query.py | |
| parent | 3d5a64ac09b55514da6fd30f0f085348c2d10496 (diff) | |
| download | sqlalchemy-14fdd6260a578488bdad95b738ea6af5c2fcd13c.tar.gz | |
Establish future behavior for Session cascade backrefs, bind
The behavior of the :paramref:`_orm.relationship.cascade_backrefs` flag
will be reversed in 2.0 and set to ``False`` unconditionally, such that
backrefs don't cascade save-update operations from a forwards-assignment to
a backwards assignment. A 2.0 deprecation warning is emitted when the
parameter is left at its default of ``True`` at the point at which such a
cascade operation actually takes place. The new behavior can be
established as always by setting the flag to ``False`` on a specific
:func:`_orm.relationship`, or more generally can be set up across the board
by setting the the :paramref:`_orm.Session.future` flag to True.
Additionally in the interests of expediency, this commit will also
move Session away from making use of bound metadata if the future=True
flag is set. An application that sets future=True should ideally
have to change as little else as possible for full 2.0 behavior.
Fixes: #5150
Change-Id: I490d1d61f09c62ffc2de983208aeed25dfe48aec
Diffstat (limited to 'lib/sqlalchemy/orm/query.py')
| -rw-r--r-- | lib/sqlalchemy/orm/query.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py index d991f6229..b8226dfc0 100644 --- a/lib/sqlalchemy/orm/query.py +++ b/lib/sqlalchemy/orm/query.py @@ -1291,7 +1291,9 @@ class Query( those being selected. """ + return self._from_self(*entities) + def _from_self(self, *entities): fromclause = ( self.with_labels() .enable_eagerloads(False) @@ -2935,7 +2937,7 @@ class Query( """ col = sql.func.count(sql.literal_column("*")) - return self.from_self(col).scalar() + return self._from_self(col).scalar() def delete(self, synchronize_session="evaluate"): r"""Perform a bulk delete query. |