Function headless_lms_models::peer_or_self_review_submissions::get_self_review_submission_by_user_and_exercise

pub async fn get_self_review_submission_by_user_and_exercise(
    conn: &mut PgConnection,
    user_id: Uuid,
    exercise_id: Uuid,
    course_instance_id: Uuid
) -> ModelResult<Option<PeerOrSelfReviewSubmission>>