Function headless_lms_models::library::peer_or_self_reviewing::try_to_select_exercise_slide_submission_for_peer_review

pub async fn try_to_select_exercise_slide_submission_for_peer_review(
    conn: &mut PgConnection,
    exercise: &Exercise,
    reviewer_user_exercise_state: &UserExerciseState,
    fetch_service_info: impl Fn(Url) -> BoxFuture<'static, ModelResult<ExerciseServiceInfoApi>>
) -> ModelResult<CourseMaterialPeerOrSelfReviewData>

Tries to select a submission for user to peer review.

The selection process prioritizes peer review queue when selecting a submission for peer review. In the event where the queue is empty - in practice only when a course has just started - a random submission is selected instead. This function will only return None if no other user has made submissions for the specified exercise.