我有一个有很多Company
s的Employee
。在我的表单中,我希望用户能够动态添加员工(足够简单)。 EmployeeType
(一个AbstractType
)是复合的,包含名字和姓氏。在表单提交时,Symfony似乎不会将表单中的数据转移到“新”员工的构造函数中。我得到ArgumentCountError: Too few arguments to function Employee::__construct() ... 0 passed in ... and exactly 3 expected
。显示和编辑现有员工的工作,所以我相信我的关系等都是正确的。
缩写代码:
class Company
{
protected $employees;
public function __construct()
{
$this->employees = new ArrayCollection();
}
public function addEmployee(Employee $employee)
{
if ($this->employees->contains($employee)) {
return;
}
$this->employees->add($employee);
}
public function removeEmployee(Employee $employee)
{
if (!$this->employees->contains($employee)) {
return;
}
$this->employees->removeElement($employee);
}
}
class Employee
{
// ... firstName and lastName properties...
public function __construct(Company $company, $firstName, $lastName)
{
$this->company = $company;
$this->company->addEmployee($this);
}
// ...getter and setter for firstName / lastName...
}
class CompanyType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('employees', CollectionType::class, [
'entry_type' => EmployeeType::class,
'allow_add' => true,
'allow_delete' => false,
'required' => false,
]);
// ...other fields, some are CollectionType of TextTypes that work correctly...
}
}
class EmployeeType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('firstName')
->add('lastName');
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Employee::class,
]);
}
}
class CompanyController
{
// Never mind that this is a show and not edit, etc.
public function showAction()
{
// Assume $this->company is a new or existing Company
$form = $this->createForm(CompanyType::class, $this->company);
$form->handleRequest($this->request);
if ($form->isSubmitted() && $form->isValid()) {
$company = $form->getData();
$entityManager = $this->getDoctrine()->getManager();
$entityManager->persist($company);
$entityManager->flush();
}
// set flash message, redirect, etc.
}
// ...render view...
}
修改现有员工时,上述操作将起作用,而不是在创建新员工时。从Symfony代码中调试,我可以看到新员工没有数据存在,所以它试图在empty_data
中找到CompanyType
的闭包或定义。我已经尝试了这一切(通过configureOptions
和empty_data
选项在构建CompanyType::buildForm
表格时),例如https://symfony.com/doc/current/form/use_empty_data.html。我的直觉告诉我,我甚至不需要这样做,因为表单数据不应该是空的(我明确地填写了字段)。
我也尝试过使用模型变换器。在这种情况下,从形式(传递给new CallbackTransformer
的第二个函数参数)的转换甚至没有被击中。
视图在添加新员工字段时正确设置名称属性,例如form[employees][1][firstName]
等。这不是问题。它还将正确的数据发送到控制器。我通过CompanyType::onPreSubmit
(使用事件监听器)检查表单提交数据来确认这一点。
我还有CollectionType
的TextType
用于CompanyType
的其他东西,那些工作正常。所以问题似乎与EmployeeType
是复合(包含多个字段)的事实有关。
希望以上内容足以说明问题所在。有任何想法吗?
更新:
似乎问题是没有为Symfony工作的Employee
的实例化。在内部,每个字段都传递给Symfony\Component\Form\Form::submit()
。对于现有员工,还有一个Employee
传入。对于新的,它是null
。这就解释了为什么它正在寻找empty_data
,但我不知道为什么我不能让empty_data
工作。
解决方案是定义化合物形式的empty_data
,而不是CollectionType
形式。
我的情况有点奇怪,因为我还需要在Company
中使用EmployeeType
的实例,因为它必须传递给Employee
的构造函数。我通过将公司作为表格选项传递到configureOptions
(由控制器提供),然后进入entry_options
来实现这一点。我不知道这是否是最佳做法,但它有效:
确保我们传入公司实例,因此在构建新的EmployeeType
时可以在Employee
中使用它:
$form = $this->createForm(CompanyType::class, $this->company, [
// This is a form option, valid because it's in CompanyType::configureOptions()
'company' => $this->company,
]);
class CompanyType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('employees', CollectionType::class, [
// ...
// Pass the Company instance to the EmployeeType.
'entry_options' => [ 'company' => $options['company'] ],
// This was also needed, apparently.
'by_reference' => false,
]);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
// Allows the controller to pass in a Company instance.
'company' => null,
]);
}
}
在这里,我们确保empty_data
从表单数据中正确构建Employee。
class EmployeeType extends AbstractType
{
private $company;
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('firstName')
->add('lastName');
// A little weird to set a class property here, but we need the Company
// instance in the 'empty_data' definition in configureOptions(),
// at which point we otherwise wouldn't have access to the Company.
$this->company = $options['company'];
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Employee::class,
'empty_data' => function (FormInterface $form) use ($resolver) {
return new Employee(
$this->company,
$form->get('firstName')->getData(),
$form->get('lastName')->getData(),
);
},
]);
}
}
中提琴!我现在可以添加新员工了。
希望这有助于其他人!