evaluate_filter crashes on EvalCase — missing dict normalization before filtering

[willfrey]

Bug

braintrust eval --filter metadata.name='...' crashes when data contains EvalCase objects:

AttributeError: 'EvalCase' object has no attribute 'get'

Cause

run_evaluator_task normalizes both dicts and EvalCase objects:

if isinstance(datum, dict):
    datum = EvalCase.from_dict(datum)

But evaluate_filter runs before this normalization and assumes dict-only input:

def evaluate_filter(object, filter: Filter):
    key = object
    for p in filter.path:
        key = key.get(p)  # fails — EvalCase has no .get()

The filtered_iterator sits between the raw data and run_evaluator_task, so EvalCase objects hit .get() before they can be normalized.

Reproduction

from braintrust import Eval, EvalCase

Eval(
    "test",
    data=[EvalCase(input="hello", metadata={"name": "foo"})],
    task=lambda x: x,
    scores=[],
)

braintrust eval --filter metadata.name='foo' path/to/above.py

Affected versions

0.11.0 through 0.12.1 (latest).

Suggested fix

Normalize to a Mapping before filtering (matching run_evaluator_task's approach), or use __getitem__ which SerializableDataClass already provides. Using Mapping is more precise since .get() is defined on Mapping, not just dict:

from collections.abc import Mapping

def evaluate_filter(object, filter: Filter):
    key = object if isinstance(object, Mapping) else object.as_dict()
    for p in filter.path:
        key = key.get(p)
        if key is None:
            return False
    return filter.pattern.match(serialize_json_with_plain_string(key)) is not None

[AbhiPrasad]

Hey Will Frey (@willfrey) thanks for the issue, and sorry for the trouble! Taking a look now.

[AbhiPrasad]

opened a fix with #211, will get this out with the next release!

[willfrey]

Thank you Abhijeet Prasad (@AbhiPrasad) for the quick fix!