# AN-2026-0787: SQLAlchemy 2.0 (Jan 26, 2023): legacy ORM API warnings: "Query.get() method is considered legacy", "declarative_base() function is now available as sqlalchemy.orm.declarative_base()"

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- id: AN-2026-0787 (version 1; cite https://breakwire.org/claim/AN-2026-0787/v/1)
- kind: deprecation · status: active · review: editor
- source: <https://docs.sqlalchemy.org/en/20/errors.html#:~:text=The%20RemovedIn20Warning%20deprecation>
- more sources: <https://docs.sqlalchemy.org/en/20/changelog/migration_20.html#:~:text=ORM%20Query%20-%20get()%20method%20moves%20to%20Session> <https://github.com/sqlalchemy/sqlalchemy/blob/rel_2_1_8/lib/sqlalchemy/util/deprecations.py#L172> <https://github.com/sqlalchemy/sqlalchemy/blob/rel_2_1_8/lib/sqlalchemy/ext/declarative/__init__.py#L23>
- event date: 2023-01-26
- services: sqlalchemy, python
- affected: pypi:sqlalchemy >=2.0.0
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. SQLAlchemy's error reference (code b8d9, opened 2026-11-04) explains that SQLAlchemy 2.0 changes core usage patterns and that warnings with "Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9" point to the 2.0 migration guide. The migration guide moves Query.get() to Session.get() and makes Declarative a first-class sqlalchemy.orm API.  [✓0 ✗0]
1. Reproduced 2026-11-04 with SQLAlchemy 2.0.57 and 2.1.8 (warnings, not errors): session.query(A).get(1) emits LegacyAPIWarning "The Query.get() method is considered legacy as of the 1.x series of SQLAlchemy and becomes a legacy construct in 2.0. The method is now available as Session.get() (deprecated since: 2.0)"; sqlalchemy.ext.declarative.declarative_base() emits MovedIn20Warning "The ``declarative_base()`` function is now available as sqlalchemy.orm.declarative_base(). (deprecated since: 2.0)  [✓0 ✗0]

## Fix
```text
Use `session.get(Model, pk)` instead of `session.query(Model).get(pk)`; import `from sqlalchemy.orm import declarative_base` (or subclass `sqlalchemy.orm.DeclarativeBase`). These are warnings; code keeps working, but run with `-W error::sqlalchemy.exc.SADeprecationWarning` in tests to find the rest.
```

## Error signatures
- substring: `is considered legacy as of the` (lib/sqlalchemy/util/deprecations.py (rel_2_1_8 L172); reproduced with Query.get())
- substring: `The ''declarative_base()'' function is now available as` (lib/sqlalchemy/ext/declarative/__init__.py (rel_2_1_8 L23); reproduced)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0787/reports_

## History
- v1 2026-11-04 by wire-editor: created