How to get a resource by name

[dagsir[bot]]

Getting a resource's dependent resource by name

I'm using a factory function to create a resource, something like

def storage_bucket(dependent_resource_name):
    @resource(
        required_resource_keys={dependent_resource_name},
    )
    def _storage_bucket(init_context):
        credentials = init_context.resources[dependent_resource_name]
        return StorageBucket(credentials)
    return _storage_bucket

The problem is in the line credentials = init_context.resources[dependent_resource_name] which is giving me the error TypeError: tuple indices must be integers or slices, not str. I'm aware that init_context.resources is a _ScopeResources. I also see that _ScopedResource implements __getitem__, which is why I assumed this would work.
I know that I could call _ScopedResources._asdict() and the get the resource by name.
Can anyone suggest the :dagster: way to do this?

---

The question was originally asked in Dagster Slack.

[yuhan]

You can use getattr, for example:

from dagster import op, job, ResourceDefinition


@op(required_resource_keys={"a", "b", "c"})
def my_op(context):
    print(getattr(context.resources, "a"))  # 1
    print(getattr(context.resources, "b"))  # 2
    print(getattr(context.resources, "c"))  # 3


@job(
    resource_defs={
        "a": ResourceDefinition.hardcoded_resource(1),
        "b": ResourceDefinition.hardcoded_resource(2),
        "c": ResourceDefinition.hardcoded_resource(3),
    }
)
def my_job():
    my_op()