Nested configurable resources not initialised if all the fields have default values

[tonyyzy]

What's the issue?

• ConfigurableResource A is used to configure ConfigurableResource B
• Run time config is set on A
• If all A's fields have default values, B does not see the run time configs

What did you expect to happen?

B would get the runtime config via A

How to reproduce?

from dagster import (
    ConfigurableResource,
    asset,
    materialize,
)


class ResourceA(ConfigurableResource):
    date: str = "2025-01-20"


class ResourceB(ConfigurableResource):
    resource_a: ResourceA


@asset
def test_asset(resource_A: ResourceA, resource_B: ResourceB) -> None:
    print("resource A's date: ", resource_A.date)
    print("resource B's resource A's date: ", resource_B.resource_a.date)


resource_A = ResourceA.configure_at_launch()
materialize(
    [test_asset],
    resources={
        "resource_A": resource_A,
        "resource_B": ResourceB.configure_at_launch(resource_a=resource_A),
    },
    run_config={
        "loggers": {"console": {"config": {"log_level": "ERROR"}}},
        "resources": {"resource_A": {"config": {"date": "2025-01-21"}}},
    },
)

This gives

resource A's date:  2025-01-21
resource B's resource A's date:  2025-01-20

while I'd expect

resource A's date:  2025-01-21
resource B's resource A's date:  2025-01-21

If some fields of A do not have default values

from dagster import (
    ConfigurableResource,
    asset,
    materialize,
)


class ResourceA(ConfigurableResource):
    date: str


class ResourceB(ConfigurableResource):
    resource_a: ResourceA


@asset
def test_asset(resource_A: ResourceA, resource_B: ResourceB) -> None:
    print("resource A's date: ", resource_A.date)
    print("resource B's resource A's date: ", resource_B.resource_a.date)


resource_A = ResourceA.configure_at_launch()
materialize(
    [test_asset],
    resources={
        "resource_A": resource_A,
        "resource_B": ResourceB.configure_at_launch(resource_a=resource_A),
    },
    run_config={
        "loggers": {"console": {"config": {"log_level": "ERROR"}}},
        "resources": {"resource_A": {"config": {"date": "2025-01-21"}}},
    },
)

This gives the expected output

resource A's date:  2025-01-21
resource B's resource A's date:  2025-01-21

Dagster version

dagster, version 1.7.16

Deployment type

None

Deployment details

No response

Additional information

No response

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