Method __init__

lib/sqlalchemy/orm/util.py:1580–1612

r"""Construct a new :class:`.Bundle`. e.g.:: bn = Bundle("mybundle", MyClass.x, MyClass.y) for row in session.query(bn).filter(bn.c.x == 5).filter(bn.c.y == 4): print(row.mybundle.x, row.mybundle.y) :param name: name of the bundle.

(
        self, name: str, *exprs: _ColumnExpressionArgument[Any], **kw: Any
    )

    exprs: List[_ColumnsClauseElement]

    def __init__(
        self, name: str, *exprs: _ColumnExpressionArgument[Any], **kw: Any
    ):
        r"""Construct a new :class:`.Bundle`.

        e.g.::

            bn = Bundle("mybundle", MyClass.x, MyClass.y)

            for row in session.query(bn).filter(bn.c.x == 5).filter(bn.c.y == 4):
                print(row.mybundle.x, row.mybundle.y)

        :param name: name of the bundle.
        :param \*exprs: columns or SQL expressions comprising the bundle.
        :param single_entity=False: if True, rows for this :class:`.Bundle`
         can be returned as a "single entity" outside of any enclosing tuple
         in the same manner as a mapped entity.

        """  # noqa: E501
        self.name = self._label = name
        coerced_exprs = [
            coercions.expect(
                roles.ColumnsClauseRole, expr, apply_propagate_attrs=self
            )
            for expr in exprs
        ]
        self.exprs = coerced_exprs

        self.c = self.columns = ColumnCollection(
            (getattr(col, "key", col._label), col)
            for col in [e._annotations.get("bundle", e) for e in coerced_exprs]
        ).as_readonly()
        self.single_entity = kw.pop("single_entity", self.single_entity)

    def _gen_cache_key(
        self, anon_map: anon_map, bindparams: List[BindParameter[Any]]