Forward references in saving

[JacobHast]

If I have a component with an attribute using forward referencing,

e.g.

@quam_dataclass
class ComponentA(QuamComponent):
    x: int

@quam_dataclass
class ComponentB(QuamComponent):
     component_a = "ComponentA"

I get a ComponentA is not defined NameError when calling .save()

At the moment this is an issue for us, as we are using qubits and resonators which have resonator and qubit attributes respectively, and so to avoid circular imports we use forward referencing, which seems to work well, except that we can save our state.

[nulinspiratie]

Forward referencing is indeed an issue, partly because determining the correct class from the string is problematic.
Can I suggest to first try adding if TYPE_CHECKING: and see if that resolves the issue. So for example:

resonator.py

from typing import TYPE_CHECKING
from quam.core import QuamComponent, quam_dataclass

if TYPE_CHECKING:
    from quam.examples.superconducting_qubits.qubit import Qubit


@quam_dataclass
class Resonator(QuamComponent):
    qubit: Qubit

qubit.py

from typing import TYPE_CHECKING
from quam.core import QuamComponent, quam_dataclass

if TYPE_CHECKING:
    from quam.examples.superconducting_qubits.resonator import Resonator


@quam_dataclass
class Qubit(QuamComponent):
    resonator: Resonator

Let me know if this resolves your issue

[JacobHast]

This doesn't seem to work unfortunately, I get an error name 'Resonator' is not defined from the line resonator: Resonator when importing from qubit.py in your example.