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[Brian Haley <2051171@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Running 'tox -e pep8' in neutron-lib or neutron repo generates this new
warning:

/home/bhaley/git/neutron-lib/neutron_lib/db/model_base.py:113: MovedIn20Warning: Deprecated API features detected! These feature(s) are not compatible with SQLAlchemy 2.0. To prevent incompatible upgrades prior to updating applications, ensure requirements files are pinned to "sqlalchemy<2.0". Set environment variable SQLALCHEMY_WARN_20=1 to show all deprecation warnings.  Set environment variable SQLALCHEMY_SILENCE_UBER_WARNING=1 to silence this message. (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)
  BASEV2 = declarative.declarative_base(cls=NeutronBaseV2)

Google eventually points in this direction:

https://docs.sqlalchemy.org/en/20/changelog/whatsnew_20.html#step-one-
orm-declarative-base-is-superseded-by-orm-declarativebase

So moving to use sqlalchemy.orm.DeclarativeBase class is the future.

Might be a little tricky to implement as sqlalchemy is currently pinned
in UC:

sqlalchemy===1.4.50

** Affects: neutron
     Importance: High
         Status: Confirmed

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https://bugs.launchpad.net/bugs/2051171

Title:
  SQLalchemy 2.0 warning in neutron-lib

Status in neutron:
  Confirmed

Bug description:
  Running 'tox -e pep8' in neutron-lib or neutron repo generates this
  new warning:

  /home/bhaley/git/neutron-lib/neutron_lib/db/model_base.py:113: MovedIn20Warning: Deprecated API features detected! These feature(s) are not compatible with SQLAlchemy 2.0. To prevent incompatible upgrades prior to updating applications, ensure requirements files are pinned to "sqlalchemy<2.0". Set environment variable SQLALCHEMY_WARN_20=1 to show all deprecation warnings.  Set environment variable SQLALCHEMY_SILENCE_UBER_WARNING=1 to silence this message. (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)
    BASEV2 = declarative.declarative_base(cls=NeutronBaseV2)

  Google eventually points in this direction:

  https://docs.sqlalchemy.org/en/20/changelog/whatsnew_20.html#step-one-
  orm-declarative-base-is-superseded-by-orm-declarativebase

  So moving to use sqlalchemy.orm.DeclarativeBase class is the future.

  Might be a little tricky to implement as sqlalchemy is currently
  pinned in UC:

  sqlalchemy===1.4.50

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