警告：非法字符串偏移量'city'Symfony表单搜索

Question

发送搜索表单时出现问题。

交响乐说

警告：非法字符串偏移量'city'

这是我处理表单的功能

public function searchTeam($option)
{
    return $this->createQueryBuilder('t') // t = team
                ->leftJoin('t.cities','city')
                ->where('city.name = :cityName')
                ->setParameter("cityName", $option['city']->getName())
                ->andWhere('t.name = :name')
                ->setParameter("name", $option['name'])
                ->getQuery()
                ->getResult();
}

和我的TeamController：

$formSearchTeam = $this->createForm(SearchTeamType::class, $team);
$formSearchTeam->handleRequest($request);

if($formSearchTeam->isSubmitted() && $formSearchTeam->isValid()) {
    $option = $formSearchTeam->getData()->getName();
    $teamSearch = $repo->searchTeam($option);
    dd($teamSearch);
}

我将dd($option)用于查看要发送的表单的数据，然后恢复了该数据：

    TeamController.php on line 56:
    AppEntityTeam {#1068 ▼
      -id: null
      -name: "New"
      -picture: null
      -home_team: DoctrineCommonCollectionsArrayCollection {#1071 ▶}
      -outside_team: DoctrineCommonCollectionsArrayCollection {#1085 ▶}
      -city: AppEntityCity {#1095 ▼
        -id: 7
        -name: "Paris"
        -zip_code: 75000
        -teams: DoctrineORMPersistentCollection {#1093 ▼
          -snapshot: []
          -owner: AppEntityCity {#1095}
          -association: array:15 [ …15]
          -em: DoctrineORMEntityManager {#490 …11}
          -backRefFieldName: "city"
          -typeClass: DoctrineORMMappingClassMetadata {#801 …}
          -isDirty: false
          #collection: DoctrineCommonCollectionsArrayCollection {#1170 ▶}
          #initialized: false
        }
      }
      -team_asking: DoctrineCommonCollectionsArrayCollection {#1129 ▶}
      -accepting_team: DoctrineCommonCollectionsArrayCollection {#1125 ▶}
      -Team_lead: null
      -User: DoctrineCommonCollectionsArrayCollection {#1080 ▶}
    }