backend/code_review_backend/issues/compare.py

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from code_review_backend.issues.models import Diff, IssueLink


def detect_new_for_revision(diff: Diff, path: str, hash: str) -> bool:
    """
    Detect if an issue identified by its path and hash are new for a revision, from its diff
    This function ignores pre-existing issues outside of that revision !
    """
    assert diff is not None, "Missing diff"
    return not IssueLink.objects.filter(
        revision_id=diff.revision_id,
        diff_id__lt=diff.id,
        issue__path=path,
        issue__hash=hash,
    ).exists()