给定类型为"字符串"、"应用\实体"的预期参数

Question

我尝试插入关系为OneToMany-ManyToOne的记录，但是我遇到了错误。

Expected argument of type "string", "AppEntityQuestion" given.

我有下一个实体question和answer.

class Question
{
/**
* @ORMId()
* @ORMGeneratedValue()
* @ORMColumn(type="integer")
*/
private $id;
/**
* @ORMColumn(type="text")
*/
private $title;
/**
* @ORMOneToMany(targetEntity="AppEntityAnswer", mappedBy="question", orphanRemoval=true)
*/
private $answers;
public function __construct()
{
$this->answers = new ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
public function getTitle(): ?string
{
return $this->title;
}
public function setTitle(string $title): self
{
$this->title = $title;
return $this;
}
/**
* @return Collection|Answer[]
*/
public function getAnswers(): Collection
{
return $this->answers;
}
public function addAnswer(Answer $answer): self
{
if (!$this->answers->contains($answer)) {
$this->answers[] = $answer;
$answer->setQuestion($this);
}
return $this;
}
public function removeAnswer(Answer $answer): self
{
if ($this->answers->contains($answer)) {
$this->answers->removeElement($answer);
if ($answer->getQuestion() === $this) {
$answer->setQuestion(null);
}
}
return $this;
}
}

实体Answer

class Answer
{
/**
* @ORMId()
* @ORMGeneratedValue()
* @ORMColumn(type="integer")
*/
private $id;
/**
* @ORMColumn(type="text")
*/
private $text;
/**
* @ORMColumn(type="boolean")
*/
private $is_correct;
/**
* @ORMManyToOne(targetEntity="AppEntityQuestion", inversedBy="answers")
* @ORMJoinColumn(nullable=false)
*/
private $question;
public function getId(): ?int
{
return $this->id;
}
public function getText(): ?string
{
return $this->text;
}
public function setText(string $text): self
{
$this->text = $text;
return $this;
}
public function getIsCorrect(): ?bool
{
return $this->is_correct;
}
public function setIsCorrect(bool $is_correct): self
{
$this->is_correct = $is_correct;
return $this;
}
public function getQuestion(): ?question
{
return $this->question;
}
public function setQuestion(?Question $question): self
{
$this->question = $question;
return $this;
}

}

我的表格

public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title', EntityType::class, array(
'class' => Question::class,
'choice_label' => 'title',
'label' => 'Question'
));
$builder
->add('answers', CollectionType::class, array(
'entry_type' => AnswerType::class,
'entry_options' => array('label' => false),
'allow_add' => true,
'by_reference'  => false,
));
$builder
->add('create', SubmitType::class, ['label' => 'Add', 'attr' => ['class' => 'btn btn-primary']]);

}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Question::class
]);
}

我的控制器片段

$question = new Question();
$answer = new Answer();
$question->addAnswer($answer);
$form1 = $this->createForm(QuestionAnswerType::class, $question);
$form1->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($question);
$em->flush();
}

下一行的错误指针

$form1->handleRequest($request);

我知道我的控制器有问题，但我不知道如何解决。

我不明白如何正确插入具有关系的记录 一对多-多对一.你能帮我吗？

Answer 1

我认为您看到此错误的原因是，在Question类中，您已将title字段定义为文本类型(@ORMColumn(type="text")(。

但是，在您的表单中，您已将表单字段title定义为EntityType这就是我认为您看到此错误的原因。

您可以通过更改Question类中标题字段的数据库映射来解决此问题，也可以将表单更改为使用TextType而不是EntityType

希望这有帮助

Answer 2

您必须在两个地方进行更改。

1(第一次改为"问题"类

/**
* @ORMColumn(type="string")
*/
private $title; 

2(进入表单类后，将"实体类型：：类"替换为"文本类型：：类"，并从标题中删除"类"和"choice_label"属性

public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title', TextType::class, array(
'label' => 'Question'
));
..... your other code ...   
}

Answer 3

在类中 缺少问题__toString函数

public function __toString()
{
return $this->property-to-show;
}