In the docs, it says I have to use

FieldSet

in the

infer_from

which I do:

@dataclass(frozen=True)
class InferDependencyGlobsRequestFieldSet(FieldSet):
    required_fields = (MyDependencies, DependencyGlobsField)
    dependencies: MyDependencies
    globs: DependencyGlobsField

class InferDependencyGlobsRequest(InferDependenciesRequest):
    infer_from = InferDependencyGlobsRequestFieldSet

...

@rule
async def find_dependencies_by_glob(
    request: InferDependencyGlobsRequest,
) -> InferredDependencies:
    <http://logger.info|logger.info>(request.infer_from.dependencies)
    ...

I get

AttributeError: type object 'InferDependencyGlobsRequestFieldSet' has no attribute 'dependencies'

. But clearly

dependencies

is in the dataclass definition? 😕 Doing

<http://logger.info|logger.info>

gives me

'applicable_target_types', 'create', 'debug_hint', 'is_applicable', 'metadata', 'opt_out', 'required_fields'

for public attributes.

never mind, looks like that pattern is used for other similar field sets

what does

MyDependencies

look like?

oh

you want

request.field_set

infer_from

is a

ClassVar

the actual

FieldSet

instance is an instance attribute called

field_set

for example, https://github.com/pantsbuild/pants/blob/abcf57c306375c8ccc0af802e4b60706ee636aa3/src/python/pants/backend/java/dependency_inference/rules.py#L65