Released 2023-09-11

• Deprecate the __version__ attribute. Use feature detection, or importlib.metadata.version("flask-sqlalchemy"), instead. :issue:`5230`

Released 2023-09-11

• Drop support for Python 3.7. :pr:`1251`
• Add support for the SQLAlchemy 2.x API via model_class parameter. :issue:`1140`
• Bump minimum version of SQLAlchemy to 2.0.16.
• Remove previously deprecated code.
• Pass extra keyword arguments from get_or_404 to session.get. :issue:`1149`
• Fix bug with finding right bind key for clause statements. :issue:`1211`

Released 2023-06-21

• Pagination.next() enforces max_per_page. :issue:`1201`
• Improve type hint for get_or_404 return value to be non-optional. :pr:`1226`

Released 2023-06-19

• Fix type hint for get_or_404 return value. :pr:`1208`
• Fix type hints for pyright (used by VS Code Pylance extension). :issue:`1205`

Released 2023-01-31

• Show helpful errors when mistakenly using multiple SQLAlchemy instances for the same app, or without calling init_app. :pr:`1151`
• Fix issue with getting the engine associated with a model that uses polymorphic table inheritance. :issue:`1155`

Released 2022-10-14

• Update compatibility with SQLAlchemy 2. :issue:`1122`

Released 2022-10-11

• Export typing information instead of using external typeshed definitions. :issue:`1112`
• If default engine options are set, but SQLALCHEMY_DATABASE_URI is not set, an invalid default bind will not be configured. :issue:`1117`

Released 2022-10-04

• Drop support for Python 2, 3.4, 3.5, and 3.6.
• Bump minimum version of Flask to 2.2.
• Bump minimum version of SQLAlchemy to 1.4.18.
• Remove previously deprecated code.
• The session is scoped to the current app context instead of the thread. This requires that an app context is active. This ensures that the session is cleaned up after every request.
• An active Flask application context is always required to access session and engine, regardless of if an application was passed to the constructor. :issue:`508, 944`
• Different bind keys use different SQLAlchemy MetaData registries, allowing tables in different databases to have the same name. Bind keys are stored and looked up on the resulting metadata rather than the model or table.
• SQLALCHEMY_DATABASE_URI does not default to sqlite:///:memory:. An error is raised if neither it nor SQLALCHEMY_BINDS define any engines. :pr:`731`
• Configuring SQLite with a relative path is relative to app.instance_path instead of app.root_path. The instance folder is created if necessary. :issue:`462`
• Added get_or_404, first_or_404, one_or_404, and paginate methods to the extension object. These use SQLAlchemy's preferred session.execute(select()) pattern instead of the legacy query interface. :issue:`1088`
• Setup methods that create the engines and session are renamed with a leading underscore. They are considered internal interfaces which may change at any time.
• All parameters to SQLAlchemy except app are keyword-only.
• Renamed the bind parameter to bind_key and removed the app parameter from various SQLAlchemy methods.
• The extension object uses __getattr__ to alias names from the SQLAlchemy package, rather than copying them as attributes.
• The extension object is stored directly as app.extensions["sqlalchemy"]. :issue:`698`
• The session class can be customized by passing the class_ key in the session_options parameter. :issue:`327`
• SignallingSession is renamed to Session.
• Session.get_bind more closely matches the base implementation.
• Model classes and the db instance are available without imports in flask shell. :issue:`1089`
• The CamelCase to snake_case table name converter handles more patterns correctly. If model that was already created in the database changed, either use Alembic to rename the table, or set __tablename__ to keep the old name. :issue:`406`
• Model repr distinguishes between transient and pending instances. :issue:`967`
• A custom model class can implement __init_subclass__ with class parameters. :issue:`1002`
• db.Table is a subclass instead of a function.
• The engine_options parameter is applied as defaults before per-engine configuration.
• SQLALCHEMY_BINDS values can either be an engine URL, or a dict of engine options including URL, for each bind. SQLALCHEMY_DATABASE_URI and SQLALCHEMY_ENGINE_OPTIONS correspond to the None key and take precedence. :issue:`783`
• Engines are created when calling init_app rather than the first time they are accessed. :issue:`698`
• db.engines exposes the map of bind keys to engines for the current app.
• get_engine, get_tables_for_bind, and get_binds are deprecated.
• SQLite driver-level URIs that look like sqlite:///file:name.db?uri=true are supported. :issue:`998, 1045`
• SQLite engines do not use NullPool if pool_size is 0.
• MySQL engines use the "utf8mb4" charset by default. :issue:`875`
• MySQL engines do not set pool_size to 10.
• MySQL engines don't set a default for pool_recycle if not using a queue pool. :issue:`803`
• Query is renamed from BaseQuery.
• Added Query.one_or_404.
• The query class is applied to backref in relationship. :issue:`417`
• Creating Pagination objects manually is no longer a public API. They should be created with db.paginate or query.paginate. :issue:`1088`
• Pagination.iter_pages and Query.paginate parameters are keyword-only.
• Pagination is iterable, iterating over its items. :issue:`70`
• Pagination count query is more efficient.
• Pagination.iter_pages is more efficient. :issue:`622`
• Pagination.iter_pages right_current parameter is inclusive.
• Pagination per_page cannot be 0. :issue:`1091`
• Pagination max_per_page defaults to 100. :issue:`1091`
• Added Pagination.first and last properties, which give the number of the first and last item on the page. :issue:`567`
• SQLALCHEMY_RECORD_QUERIES is disabled by default, and is not enabled automatically with app.debug or app.testing. :issue:`1092`
• get_debug_queries is renamed to get_recorded_queries to better match the config and functionality.
• Recorded query info is a dataclass instead of a tuple. The context attribute is renamed to location. Finding the location uses a more inclusive check.
• SQLALCHEMY_TRACK_MODIFICATIONS is disabled by default. :pr:`727`
• SQLALCHEMY_COMMIT_ON_TEARDOWN is deprecated. It can cause various design issues that are difficult to debug. Call db.session.commit() directly instead. :issue:`216`

Released 2021-03-18

• Fix compatibility with Python 2.7.

Released 2021-03-18

• Update to support SQLAlchemy 1.4.
• SQLAlchemy URL objects are immutable. Some internal methods have changed to return a new URL instead of None. :issue:`885`

Released 2020-07-14

• Change base class of meta mixins to type. This fixes an issue caused by a regression in CPython 3.8.4. :issue:`852`

Released 2020-05-26

• Deprecate SQLALCHEMY_COMMIT_ON_TEARDOWN as it can cause various design issues that are difficult to debug. Call db.session.commit() directly instead. :issue:`216`

Released 2020-05-25

• Fix bad pagination when records are de-duped. :pr:`812`

Released 2019-09-24

• Fix AttributeError when using multiple binds with polymorphic models. :pr:`651`

Released 2019-04-24

• Drop support for Python 2.6 and 3.3. :pr:`687`
• Address SQLAlchemy 1.3 deprecations. :pr:`684`
• Make engine configuration more flexible. Added the engine_options parameter and SQLALCHEMY_ENGINE_OPTIONS config. Deprecated the individual engine option config keys SQLALCHEMY_NATIVE_UNICODE, SQLALCHEMY_POOL_SIZE, SQLALCHEMY_POOL_TIMEOUT, SQLALCHEMY_POOL_RECYCLE, and SQLALCHEMY_MAX_OVERFLOW. :pr:`684`
• get_or_404() and first_or_404() now accept a description parameter to control the 404 message. :issue:`636`
• Use time.perf_counter for Python 3 on Windows. :issue:`638`
• Add an example of Flask's tutorial project, Flaskr, adapted for Flask-SQLAlchemy. :pr:`720`

Released 2017-10-11

• Don't mask the parent table for single-table inheritance models. :pr:`561`

Released 2017-10-05

• If a model has a table name that matches an existing table in the metadata, use that table. Fixes a regression where reflected tables were not picked up by models. :issue:`551`
• Raise the correct error when a model has a table name but no primary key. :pr:`556`
• Fix repr on models that don't have an identity because they have not been flushed yet. :issue:`555`
• Allow specifying a max_per_page limit for pagination, to avoid users specifying high values in the request args. :pr:`542`
• For paginate with error_out=False, the minimum value for page is 1 and per_page is 0. :issue:`558`

Released 2017-09-28

• Multiple bugs with __tablename__ generation are fixed. Names will be generated for models that define a primary key, but not for single-table inheritance subclasses. Names will not override a declared_attr. PrimaryKeyConstraint is detected. :pr:`541`
• Passing an existing declarative_base() as model_class to SQLAlchemy.__init__ will use this as the base class instead of creating one. This allows customizing the metaclass used to construct the base. :issue:`546`
• The undocumented DeclarativeMeta internals that the extension uses for binds and table name generation have been refactored to work as mixins. Documentation is added about how to create a custom metaclass that does not do table name generation. :issue:`546`
• Model and metaclass code has been moved to a new models module. _BoundDeclarativeMeta is renamed to DefaultMeta; the old name will be removed in 3.0. :issue:`546`
• Models have a default repr that shows the model name and primary key. :pr:`530`
• Fixed a bug where using init_app would cause connectors to always use the current_app rather than the app they were created for. This caused issues when multiple apps were registered with the extension. :pr:`547`

Released 2017-02-27, codename Dubnium

• Minimum SQLAlchemy version is 0.8 due to use of sqlalchemy.inspect.
• Added support for custom query_class and model_class as args to the SQLAlchemy constructor. :pr:`328`
• Allow listening to SQLAlchemy events on db.session. :pr:`364`
• Allow __bind_key__ on abstract models. :pr:`373`
• Allow SQLALCHEMY_ECHO to be a string. :issue:`409`
• Warn when SQLALCHEMY_DATABASE_URI is not set. :pr:`443`
• Don't let pagination generate invalid page numbers. :issue:`460`
• Drop support of Flask < 0.10. This means the db session is always tied to the app context and its teardown event. :issue:`461`
• Tablename generation logic no longer accesses class properties unless they are declared_attr. :issue:`467`

Released 2015-10-23, codename Caesium

• Table names are automatically generated in more cases, including subclassing mixins and abstract models.
• Allow using a custom MetaData object.
• Add support for binds parameter to session.

Released 2014-08-29, codename Bohrium

• Changed how the builtin signals are subscribed to skip non-Flask-SQLAlchemy sessions. This will also fix the attribute error about model changes not existing.
• Added a way to control how signals for model modifications are tracked.
• Made the SignallingSession a public interface and added a hook for customizing session creation.
• If the bind parameter is given to the signalling session it will no longer cause an error that a parameter is given twice.
• Added working table reflection support.
• Enabled autoflush by default.
• Consider SQLALCHEMY_COMMIT_ON_TEARDOWN harmful and remove from docs.

Released 2013-07-20, codename Aurum

• Added Python 3.3 support.
• Dropped Python 2.5 compatibility.
• Various bugfixes.
• Changed versioning format to do major releases for each update now.

• New distribution format (flask_sqlalchemy).
• Added support for Flask 0.9 specifics.

• Added session support for multiple databases.

• Make relative sqlite paths relative to the application root.

• Fixed an issue with Flask-SQLAlchemy not selecting the correct binds.

• Added support for multiple databases.
• Expose BaseQuery as db.Query.
• Set default query_class for db.relation, db.relationship, and db.dynamic_loader to BaseQuery.
• Improved compatibility with Flask 0.7.

• Fixed a bug introduced in 0.10 with alternative table constructors.

• Added support for signals.
• Table names are now automatically set from the class name unless overridden.
• Model.query now always works for applications directly passed to the SQLAlchemy constructor. Furthermore the property now raises a RuntimeError instead of being None.
• Added session options to constructor.
• Fixed a broken __repr__.
• db.Table is now a factory function that creates table objects. This makes it possible to omit the metadata.

• Applied changes to pass the Flask extension approval process.

• Added a few configuration keys for creating connections.
• Automatically activate connection recycling for MySQL connections.
• Added support for the Flask testing mode.

• Initial public release