How to use the crash.models.Crash.objects.get function in crash

def processing_crash_dump(self, crash_pk):
    try:
        crash = Crash.objects.get(pk=crash_pk)

        # assemble crash_dump_path
        url = furl(crash.upload_file_minidump.url)
        path = url.pathstr
        crash_dump_path = os.path.join(S3_MOUNT_PATH, *path.split('/'))

        # Set various values in the crash object.
        stacktrace = get_stacktrace(crash_dump_path)
        crash.stacktrace = stacktrace
        crash.stacktrace_json = parse_stacktrace(stacktrace)
        crash.signature = get_signature(crash.stacktrace_json)
        _os = get_os(crash.stacktrace_json)
        meta = crash.meta or {}
        build_number = meta.get('ver', '')
        channel = meta.get('channel', '') or get_channel(build_number, _os)
        crash.os = _os

def get_sentry_link(self, crash_pk, event_id):
    try:
        if SENTRY_DOMAIN and SENTRY_ORG_SLUG and SENTRY_PROJ_SLUG and SENTRY_API_KEY:
            crash = Crash.objects.get(pk=crash_pk)
            resp = requests.get(
                'http://%s/api/0/projects/%s/%s/events/%s/' % (SENTRY_DOMAIN, SENTRY_ORG_SLUG, SENTRY_PROJ_SLUG, event_id,),
                auth=(SENTRY_API_KEY, '')
            ).json()

            crash.groupid = resp['groupID']
            crash.eventid = resp['id']
            crash.save()
        else:
            logging.warning("Sentry is not congured")
    except KeyError as exc:
        logging.error("Sentry event not found")
        raise self.retry(exc=exc, countdown=2 ** get_sentry_link.request.retries)