Fix with_entities usage in db queries
In order to retrieve shares with filters
pertaining to separate tables (shares, instances, metadata,
etc), we need to perform joined loads of those
respective database tables as necessary. After the
join, the query cannot select entities due to
Github issue #6253 - The following is an error when
the pattern is used:
sqlalchemy.exc.ArgumentError: Query has only expression-based entities - can't find property named "share_metadata".
sqlalchemy 1.4 has a performance improvement that
delays query processing [2] and disallows this
pattern of usage; we can use a query.count() instead.
In another instance, we can perform joins selectively
only if asked for.
[1] https://github.com/sqlalchemy/sqlalchemy/issues/625
[2] https://docs.sqlalchemy.org/en/14/changelog/migration_14.html#many-core-and-orm-statement-objects-now-perform-much-of-their-construction-and-validation-in-the-compile-phase
Change-Id: I8aa196c171bbc224cec06f517ea22c4e91cbc06a
Closes-Bug: #1926399
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
(cherry picked from commit 6ace54c260
)
This commit is contained in:
parent
3532f5d654
commit
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@ -46,7 +46,6 @@ from sqlalchemy import MetaData
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from sqlalchemy import or_
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from sqlalchemy.orm import joinedload
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from sqlalchemy.orm import subqueryload
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from sqlalchemy.sql import distinct
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from sqlalchemy.sql.expression import literal
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from sqlalchemy.sql.expression import true
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from sqlalchemy.sql import func
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@ -2163,8 +2162,7 @@ def _share_get_all_with_filters(context, project_id=None, share_server_id=None,
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# NOTE(carloss): Count must be calculated before limit and offset are
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# applied into the query.
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if show_count:
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count = query.with_entities(
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func.count(distinct(models.Share.id))).scalar()
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count = query.count()
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if 'limit' in filters:
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offset = filters.get('offset', 0)
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@ -5266,11 +5264,7 @@ def _share_group_snapshot_get_all(
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sort_dir = 'desc'
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query = model_query(
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context, models.ShareGroupSnapshot, session=session, read_deleted='no',
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).options(
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joinedload('share_group'),
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joinedload('share_group_snapshot_members'),
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)
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context, models.ShareGroupSnapshot, session=session, read_deleted='no')
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# Apply filters
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if not filters:
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@ -5295,7 +5289,10 @@ def _share_group_snapshot_get_all(
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raise exception.InvalidInput(reason=msg)
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if detailed:
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return query.all()
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return query.options(
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joinedload('share_group'),
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joinedload('share_group_snapshot_members')
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).all()
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else:
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query = query.with_entities(models.ShareGroupSnapshot.id,
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models.ShareGroupSnapshot.name)
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