fix(2.x): session get bind signature

[dpgaspar]

Revisiting this issue, patch for 2.x

The SignallingSession get_bind is being called without any parameters, this is probably due to the new SQLAlchemy proxied mechanism for registering scoped sessions

(None, None, None, None, False) {}

This is a simple fix that just uses the exact method signature from SQLAlchemy for get_bind of the current session

fixes: Possible issue on session get_bind #953

Note: Because of the CI drift between main and 2.x I'm posting my output from tox here:

=============================================== test session starts ===============================================
platform darwin -- Python 3.7.6, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
cachedir: .tox/py37/.pytest_cache
rootdir: /Users/daniel/workarea/preset/flask-sqlalchemy, configfile: setup.cfg, testpaths: tests
collected 74 items

tests/test_basic_app.py ....                                                                                [  5%]
tests/test_binds.py ....                                                                                    [ 10%]
tests/test_commit_on_teardown.py ..                                                                         [ 13%]
tests/test_config.py ...................                                                                    [ 39%]
tests/test_meta_data.py ..                                                                                  [ 41%]
tests/test_model_class.py ....                                                                              [ 47%]
tests/test_pagination.py .....                                                                              [ 54%]
tests/test_query_class.py ...                                                                               [ 58%]
tests/test_query_property.py ....                                                                           [ 63%]
tests/test_regressions.py ....                                                                              [ 68%]
tests/test_sessions.py .....                                                                                [ 75%]
tests/test_signals.py ..                                                                                    [ 78%]
tests/test_sqlalchemy_includes.py .                                                                         [ 79%]
tests/test_table_name.py .............                                                                      [ 97%]
tests/test_utils.py ..                                                                                      [100%]

================================================ warnings summary =================================================
tests/test_commit_on_teardown.py::test_commit_on_success
tests/test_commit_on_teardown.py::test_roll_back_on_failure
  /Users/daniel/workarea/preset/flask-sqlalchemy/flask_sqlalchemy/__init__.py:903: DeprecationWarning: 'COMMIT_ON_TEARDOWN' is deprecated and will be removed in version 3.1. Call 'db.session.commit()'` directly instead.
    DeprecationWarning,

-- Docs: https://docs.pytest.org/en/stable/warnings.html
========================================= 74 passed, 2 warnings in 0.95s ==========================================
_____________________________________________________ summary _____________________________________________________
  py37: commands succeeded
  congratulations :)
 ~/w/p/flask-sqlalchemy  fix/get-session-bind-2x-v2 *2 ?2  tox -e py38               ok  14s  flask-sqlalchemy py
GLOB sdist-make: /Users/daniel/workarea/preset/flask-sqlalchemy/setup.py
py38 create: /Users/daniel/workarea/preset/flask-sqlalchemy/.tox/py38
py38 installdeps: pytest, coverage, blinker, mock
py38 inst: /Users/daniel/workarea/preset/flask-sqlalchemy/.tox/.tmp/package/1/Flask-SQLAlchemy-2.5.1.zip
py38 installed: attrs==21.2.0,blinker==1.4,click==8.0.1,coverage==5.5,Flask==2.0.1,Flask-SQLAlchemy @ file:///Users/daniel/workarea/preset/flask-sqlalchemy/.tox/.tmp/package/1/Flask-SQLAlchemy-2.5.1.zip,greenlet==1.1.1,iniconfig==1.1.1,itsdangerous==2.0.1,Jinja2==3.0.1,MarkupSafe==2.0.1,mock==4.0.3,packaging==21.0,pluggy==1.0.0,py==1.10.0,pyparsing==2.4.7,pytest==6.2.5,SQLAlchemy==1.4.23,toml==0.10.2,Werkzeug==2.0.1
py38 run-test-pre: PYTHONHASHSEED='1751660045'
py38 runtests: commands[0] | coverage run -p -m pytest --tb=short --basetemp=/Users/daniel/workarea/preset/flask-sqlalchemy/.tox/py38/tmp
=============================================== test session starts ===============================================
platform darwin -- Python 3.8.9, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
cachedir: .tox/py38/.pytest_cache
rootdir: /Users/daniel/workarea/preset/flask-sqlalchemy, configfile: setup.cfg, testpaths: tests
collected 74 items

tests/test_basic_app.py ....                                                                                [  5%]
tests/test_binds.py ....                                                                                    [ 10%]
tests/test_commit_on_teardown.py ..                                                                         [ 13%]
tests/test_config.py ...................                                                                    [ 39%]
tests/test_meta_data.py ..                                                                                  [ 41%]
tests/test_model_class.py ....                                                                              [ 47%]
tests/test_pagination.py .....                                                                              [ 54%]
tests/test_query_class.py ...                                                                               [ 58%]
tests/test_query_property.py ....                                                                           [ 63%]
tests/test_regressions.py ....                                                                              [ 68%]
tests/test_sessions.py .....                                                                                [ 75%]
tests/test_signals.py ..                                                                                    [ 78%]
tests/test_sqlalchemy_includes.py .                                                                         [ 79%]
tests/test_table_name.py .............                                                                      [ 97%]
tests/test_utils.py ..                                                                                      [100%]

================================================ warnings summary =================================================
tests/test_commit_on_teardown.py::test_commit_on_success
tests/test_commit_on_teardown.py::test_roll_back_on_failure
  /Users/daniel/workarea/preset/flask-sqlalchemy/flask_sqlalchemy/__init__.py:899: DeprecationWarning: 'COMMIT_ON_TEARDOWN' is deprecated and will be removed in version 3.1. Call 'db.session.commit()'` directly instead.
    warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/warnings.html
========================================= 74 passed, 2 warnings in 1.08s ==========================================
_____________________________________________________ summary _____________________________________________________
  py38: commands succeeded
  congratulations :)

Checklist:

• Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
• Add or update relevant docs, in the docs folder and in code.
• Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• Add .. versionchanged:: entries in any relevant code docs.
• Run pre-commit hooks and fix any issues.
• Run pytest and tox, no tests failed.

[dpgaspar]

@davidism gentle ping

[davidism]

I'm sorry, I will not have time to review this in the near future

[kanetkarster]

Any word on this or anything I can do (either on the technical or donation side) to help get this through/in a new release?

We have airflow in a virtual environment with some of our code and we'd need this get_bind change to update our sqlalchemy version.

[davidism]

Fixed in #1087