sqlalchemy.ext.mypy.infer

Undocumented

Infer the type of mapping from a Column.

E.g.:

@reg.mapped
class MyClass:
    # ...

    a = Column(Integer)

    b = Column("b", String)

    c: Mapped[int] = Column(Integer)

    d: bool = Column(Boolean)

Will resolve in MyPy as:

@reg.mapped
class MyClass:
    # ...

    a : Mapped[int]

    b : Mapped[str]

    c: Mapped[int]

    d: Mapped[bool]

Infer the type of mapping from a ColumnProperty.

This includes mappings against column_property() as well as the deferred() function.

Validate type when a left hand annotation is present and we also could infer the right hand side:

attrname: SomeType = Column(SomeDBType)

Infer the type of mapping from a relationship.

E.g.:

@reg.mapped
class MyClass:
    # ...

    addresses = relationship(Address, uselist=True)

    order: Mapped["Order"] = relationship("Order")

Will resolve in mypy as:

@reg.mapped
class MyClass:
    # ...

    addresses: Mapped[List[Address]]

    order: Mapped["Order"]

Undocumented

Determine the type based on explicit annotation only.

if no annotation were present, note that we need one there to know the type.

Undocumented