qb: assert_single (and similar) fail in typing_dispatch #897
Description
from models.orm import default, std
# Combine update and select of the updated object
res = self.client.get(
default.Post.filter(body="Hello")
.update(
author=std.assert_single(default.User.filter(name="Billie"))
)
.select("*", author=lambda p: p.author.select("**"))
)
self.assertEqual(res.body, "Hello")
self.assertEqual(res.author.name, "Zoe")
self.assertEqual({g.name for g in res.author.groups}, {"redgreen"})
produces
File "/home/sully/src/e/edgedb-python/tests/test_qb.py", line 647, in test_qb_update_03
author=std.assert_single(default.User.filter(name="Billie"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sully/src/e/edgedb-python/gel/_internal/_typing_dispatch.py", line 230, in __call__
return self._call(None, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sully/src/e/edgedb-python/gel/_internal/_typing_dispatch.py", line 273, in _call
if not _isinstance(arg, pt):
^^^^^^^^^^^^^^^^^^^^
File "/home/sully/src/e/edgedb-python/gel/_internal/_typing_dispatch.py", line 69, in _isinstance
return any(issubclass(c, args[0]) for c in genalias_mro)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/sully/src/e/edgedb-python/gel/_internal/_typing_dispatch.py", line 69, in <genexpr>
return any(issubclass(c, args[0]) for c in genalias_mro)
^^^^^^^^^^^^^^^^^^^^^^
TypeError: issubclass() arg 2 must be a class, a tuple of classes, or a union
the RHS of the failing issubclass call is ~_T_anytype.