from typing import Any from typing import Tuple from sqlalchemy import select from sqlalchemy.orm import composite from sqlalchemy.orm import DeclarativeBase from sqlalchemy.orm import Mapped from sqlalchemy.orm import mapped_column class Base(DeclarativeBase): pass class Point: def __init__(self, x: int, y: int): self.x = x self.y = y def __composite_values__(self) -> Tuple[int, int]: return self.x, self.y def __repr__(self) -> str: return "Point(x=%r, y=%r)" % (self.x, self.y) def __eq__(self, other: Any) -> bool: return ( isinstance(other, Point) and other.x == self.x and other.y == self.y ) def __ne__(self, other: Any) -> bool: return not self.__eq__(other) @classmethod def _generate(cls, x1: int, y1: int) -> "Point": return Point(x1, y1) class Vertex(Base): __tablename__ = "vertices" id: Mapped[int] = mapped_column(primary_key=True) x1: Mapped[int] y1: Mapped[int] x2: Mapped[int] y2: Mapped[int] # inferred from right hand side start = composite(Point, "x1", "y1") # taken from left hand side end: Mapped[Point] = composite(Point._generate, "x2", "y2") v1 = Vertex(start=Point(3, 4), end=Point(5, 6)) stmt = select(Vertex).where(Vertex.start.in_([Point(3, 4)])) # EXPECTED_TYPE: Select[Tuple[Vertex]] reveal_type(stmt) # EXPECTED_TYPE: composite.Point reveal_type(v1.start) # EXPECTED_TYPE: composite.Point reveal_type(v1.end) # EXPECTED_TYPE: int reveal_type(v1.end.y)