Question

我正在做一个用户可以添加联系人的应用程序。目前我还没有用户。当我切换到添加表格的人时，我有错误。谁先前工作。

当我删除或评论detailsAction和indexAction时，表单有效，当我再次恢复2操作时，表单不起作用。

错误：

无法访问空变量的属性（“名称”）。

我的控制器如下：

class MainController extends Controller
{
/**
 * @Route("/", name="index")
 *
 * @return Response
 */
public function indexAction()
{
    $entityManager= $this->getDoctrine()->getManager();
    $personaldatas = $entityManager->getRepository(Personaldata::class)->findAll();

    return $this->render("Main/index.html.twig",["personaldatas" => $personaldatas]);
}

/**
 * @Route("/{id}", name="details")
 *
 * @param $id
 */
public function detailsAction($id)
{
    $entityManager= $this->getDoctrine()->getManager();
    $personaldata = $entityManager->getRepository(Personaldata::class)->findOneBy(["id"=> $id]);
    return $this->render("Main/details.html.twig",["personaldata" => $personaldata]);
}

/**
 * @Route("/add", name="add")
 *
 * @return Response
 */
public function AddAction(Request $request)
{
    $personaldata = new Personaldata();



    $form = $this->createFormBuilder($personaldata)
        ->add("name", TextType::class)
        ->add("surname", TextType::class)
        ->add("email", TextType::class)
        ->add("phonenumber",TextType::class)
        ->add("dateofbirth",DateType::class)
        ->add("submit",SubmitType::class)
        ->getForm();

    $personaldata
        ->setCreatedAt(new \DateTime())
        ->setUpdatedAt(new \DateTime());

    if($request->isMethod("post"))
    {
        $form->handleRequest($request);

        $personaldata = $form->getData();

        $entityManager = $this->getDoctrine()->getManager();
        $entityManager->persist($personaldata);
        $entityManager->flush();

        return $this->redirectToRoute("index");
    }

    return $this->render("Main/add.html.twig",["form" => $form->createView()]);
}

我的观点如下：

{% extends "base.html.twig" %}
{% block body %}
{{ personaldata.name }}
{{ personaldata.surname }}
{{ personaldata.dateofbirth}}
{{ personaldata.phonenumber}}
{{ personaldata.email }}
{% endblock %}

任何人都知道错误是什么？

错误：

Impossible to access an attribute ("name") on a null variable
Twig_Error_Runtime
in app\Resources\views\Main\details.html.twig (line 5)
{% extends "base.html.twig" %} {% block body %}     {{ personaldata.name }}     
{{ personaldata.surname }}     {{ personaldata.dateofbirth}}     {{ 
personaldata.phonenumber}}     {{ personaldata.email }}

Answer 1

您需要检查是否有定义的数据以避免此类错误。

在PHP方面，确保存储库中存在实际检索到的数据

package simplearray;
import java.util.*;
public class SimpleArray {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    int numberOfProcesses;
    System.out.print("Processes: ");
    numberOfProcesses = input.nextInt();

    String[] process = new String[numberOfProcesses];
    int[] CPUburst = new int[numberOfProcesses];
    int[] priority = new int[numberOfProcesses];

    int[] waitingTime = new int[numberOfProcesses];

    for (int i = 0; i < numberOfProcesses; i++) {
        System.out.print("Process>> ");
        process[i] = input.next();

        System.out.print("Enter the CPU Burst>> ");
        CPUburst[i] = input.nextInt();

        System.out.print("Enter the Priority>> ");
        priority[i] = input.nextInt();
    }

    System.out.println(" | Process | CPU Burst | Priority | Waiting Time | ");

    int temp = 0;
    for (int k = 0; k < numberOfProcesses; k++) {

        waitingTime[k] = waitingTime[k] + CPUburst[k];
        temp = waitingTime[k];

        System.out.println(" |    " + process[k] + "    |    " + CPUburst[k] + "      |    " + priority[k] + "     |    " + waitingTime[k] + "        | ");

    }
}

并从您的twig文件中，您可以使用defined函数

public function detailsAction($id)
{
    $entityManager= $this->getDoctrine()->getManager();
    $personaldata = $entityManager->getRepository(Personaldata::class)->findOneBy(["id"=> $id]);

    if (count($personaldata) == 0) {
        $personaldata = null;
    }

    return $this->render("Main/details.html.twig",["personaldata" => $personaldata]);
}

无法访问空变量的属性（“名称”）

1 个答案: