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Utility collection for development with SQLalchemy ORM.

Project description

Read The Docs build Release MIT License Python version support PyPI downloads count GitHub continuous integration codecov.io status for master branch

Utility collection for development with SQLAlchemy 2.0 ORM.

Documentation

https://sqlalchemy-things.readthedocs.io

Installation

Installing sqlalchemy-things with pip:

pip install sqlalchemy-things

Examples

Single table inheritance

from sqlalchemy import orm
from sqlalchemy_things.declarative import (
    IntegerPrimaryKeyMixin,
    PolymorphicMixin,
)

class Base(orm.DeclarativeBase): ...


class ParentA(Base, IntegerPrimaryKeyMixin, PolymorphicMixin):
    __tablename__ = "single_table"


class ChildA1(ParentA):
    __mapper_args__ = {"polymorphic_identity": "child_a1"}
    some_field = sa.Column(sa.String(255))


class ChildA2(ParentA):
    __mapper_args__ = {"polymorphic_identity": "child_a2"}
    other_filed = sa.Column(sa.String(127))

Joined table inheritance with cascade primary key mixins

from sqlalchemy import orm
from sqlalchemy_things.declarative import (
    CascadeIntegerPrimaryKeyMixin,
    PolymorphicMixin,
)

class Base(orm.DeclarativeBase): ...


class ParentB(Base, CascadeIntegerPrimaryKeyMixin, PolymorphicMixin):
    __tablename__ = "parent_b"


class ChildB1(ParentB):
    __tablename__ = "child_b1"
    __mapper_args__ = {"polymorphic_identity": "child_b1"}
    some_field = sa.Column(sa.String(255))


class ChildB2(ParentB):
    __tablename__ = "child_b2"
    __mapper_args__ = {"polymorphic_identity": "child_b2"}
    some_field = sa.Column(sa.String(127))

Joined table inheritance with simple primary key mixins

from sqlalchemy import orm
from sqlalchemy_things.declarative import (
    IntegerPrimaryKeyMixin,
    ParentPrimaryKeyMixin,
    PolymorphicMixin,
)

class Base(orm.DeclarativeBase): ...


class ParentC(Base, IntegerPrimaryKeyMixin, PolymorphicMixin):
    __tablename__ = "parent_c"


class ChildC1(ParentPrimaryKeyMixin, ParentC):
    __tablename__ = "child_c1"
    __mapper_args__ = {"polymorphic_identity": "child_c1"}
    some_field = sa.Column(sa.String(255))


class ChildC2(ParentPrimaryKeyMixin, ParentC):
    __tablename__ = "child_c2"
    __mapper_args__ = {"polymorphic_identity": "child_c2"}
    some_field = sa.Column(sa.String(127))

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