Method _copy

lib/sqlalchemy/sql/schema.py:4859–4893

(
        self,
        *,
        schema: Optional[str] = None,
        target_table: Optional[Table] = None,
        **kw: Any,
    )

        return self._copy(schema=schema, target_table=target_table, **kw)

    def _copy(
        self,
        *,
        schema: Optional[str] = None,
        target_table: Optional[Table] = None,
        **kw: Any,
    ) -> ForeignKeyConstraint:
        fkc = ForeignKeyConstraint(
            [x.parent.key for x in self.elements],
            [
                x._get_colspec(
                    schema=schema,
                    table_name=(
                        target_table.name
                        if target_table is not None
                        and x._table_key() == x.parent.table.key
                        else None
                    ),
                    _is_copy=True,
                )
                for x in self.elements
            ],
            name=self.name,
            onupdate=self.onupdate,
            ondelete=self.ondelete,
            use_alter=self.use_alter,
            deferrable=self.deferrable,
            initially=self.initially,
            link_to_name=self.link_to_name,
            match=self.match,
            comment=self.comment,
        )
        for self_fk, other_fk in zip(self.elements, fkc.elements):
            self_fk._schema_item_copy(other_fk)
        return self._schema_item_copy(fkc)


class PrimaryKeyConstraint(ColumnCollectionConstraint):