许多关系设定者 [英] Many to Many Relationship Setter

问题描述

我的实体之间有多对多的关系： PurchaseOrder 和供应商。当我想要在我的Symfony项目的订单中添加一个供应商时，我总是收到以下错误消息：

I have a Many to Many relationship between my Entities: PurchaseOrder and Supplier. When I want do add a Supplier to an order in my Symfony project, I always get this error message:

属性supplier在类
Acme\AppBundle\Entity\PurchaseOrder中不公开。也许你应该创建
方法setSuppliers（）？

Property "suppliers" is not public in class "Acme\AppBundle\Entity\PurchaseOrder". Maybe you should create the method "setSuppliers()"?

当我创建一个 setSuppliers （）功能自己在 PurchaseOrder 实体：

When I make a setSuppliers() function by myself in the PurchaseOrder Entity:

public function setSuppliers(\Acme\AppBundle\Entity\Supplier $suppliers )
{
    $this->suppliers = $suppliers;

    return $this;
}

我收到此错误消息：

可追踪的致命错误：参数1传递给
Doctrine\Common\Collections\ArrayCollection :: __ construct（）必须为
类型数组，给定的对象，在
/var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php
在第519行调用，并在
/ var / www / symfony / vendor / doctrine / collections / lib / Doctrine / Common / Collections / ArrayCollection.php
第47行

Catchable Fatal Error: Argument 1 passed to Doctrine\Common\Collections\ArrayCollection::__construct() must be of the type array, object given, called in /var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php on line 519 and defined in /var/www/symfony/vendor/doctrine/collections/lib/Doctrine/Common/Collections/ArrayCollection.php line 47

？

/**
 * @Route("order/{id}/supplieradd", name="order_supplieradd")
 * @Secure(roles="ROLE_ADMIN")
 */
public function newSupplierAction(Request $request, $id)
{
    $purchaseOrder = $this->getDoctrine()
    ->getRepository('AcmeAppBundle:PurchaseOrder')
    ->find($id);

    if (!$purchaseOrder) {
        throw $this->createNotFoundException(
                'No order found for id '.$id
        );
    }

    $form = $this->createForm(new AddSupplierType(), $purchaseOrder);

    // process the form on POST
    if ($request->isMethod('POST')) {
        $form->bind($request);
        if ($form->isValid()) {             

            $em = $this->getDoctrine()->getManager();

            $em->persist($purchaseOrder);
            $em->flush();

            return new Response('Added Supplier to Order with ID '.$articleOrder->getId());
        }
    }

    return $this->render('AcmeAppBundle:BasicData:newSupplier.html.twig', array(
            'form' => $form->createView(),
            'id' => $id,
    ));
}

而我的 AddSupplierType.php

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('suppliers', 'entity', array(
         'class' => 'AcmeAppBundle:Supplier',
         'property' => 'name',
    ));
}

PurchaseOrder的某些部分和供应商实体：

 class PurchaseOrder{
  ...
         /**
         * @ORM\ManyToMany(targetEntity="Supplier", mappedBy="purchaseOrders")     
         */
    private $suppliers;

    public function __construct()
    {
        $this->suppliers = new ArrayCollection();
    }

/**
 * Add suppliers
 *
 * @param \Acme\AppBundle\Entity\Supplier $suppliers
 * @return PurchaseOrder
 */
public function addSupplier(\Acme\AppBundle\Entity\Supplier $suppliers)
{
    $this->suppliers[] = $suppliers;

    return $this;
}

/**
 * Remove suppliers
 *
 * @param \Acme\AppBundle\Entity\Supplier $suppliers
 */
public function removeSupplier(\Acme\AppBundle\Entity\Supplier $suppliers)
{
    $this->suppliers->removeElement($suppliers);
}

/**
 * Get suppliers
 *
 * @return \Doctrine\Common\Collections\Collection 
 */
public function getSuppliers()
{
    return $this->suppliers;
}
}

class Supplier{
    ...

    /**
     * @ORM\ManyToMany(targetEntity="PurchaseOrder", inversedBy="suppliers")
     * @ORM\JoinTable(name="suppliers_purchaseOrders")
     */
    private $purchaseOrders;
}

新添加删除集方法：

 /**
     * Add supplier
     *
     * @param \Acme\AppBundle\Entity\Supplier $supplier
     * @return PurchaseOrder
     */
public function addSupplier(\Acme\AppBundle\Entity\Supplier $supplier)
{
    $this->suppliers->add($supplier);

    return $this;
}

/**
 * Remove supplier
 *
 * @param \Acme\AppBundle\Entity\Supplier $supplier
 */
public function removeSupplier(\Acme\AppBundle\Entity\Supplier $supplier)
{
    $this->suppliers->removeElement($supplier);
}

public function setSuppliers($supplier)
{
     if ( is_array($supplier) ) {
        $this->suppliers = $supplier ;
    } else {
        $this->suppliers->clear() ;
        $this->suppliers->add($supplier) ;
    }
}

推荐答案

问题：

1. 语法不正确的方法名称及其参数：

1. Grammatically incorrect method name and its argument:

public function addSupplier(\Acme\AppBundle\Entity\Supplier $suppliers)

方法表示addSupplier（单数），但您接受供应商（复数）

method says addSupplier (singular) but you are accepting supplierS (plural)

您需要重构此方法为：

public function addSupplier(Supplier $supplier)
{
    $this->suppliers->add($supplier) ;
}

还：

public function removeSupplier(Supplier $supplier)
{
    $this->suppliers->removeElement($supplier) ;
}

如果你这样做，Getter和setter方法就像我的回答一样： a href =https://stackoverflow.com/questions/16539244/set-multiple-false-in-a-form-in-a-many-to-many-relation-symfony2/16564513?noredirect=1#comment23800026_16564513 >以多对多关系symfony2 的形式设置multiple ='false'。

Getter and setter method will work if you do it like my answer on: set multiple='false' in a form in a many to many relation symfony2

Symfony将找到add ...（）和remove ...（）方法本身。所以如果关系是供应商，它会发现addSupplier。或者如果关系是类别，它将会找到addCategory（）和removeCategory（）。

Symfony will find add...() and remove...() methods by itself. So if relation is "suppliers", it will find addSupplier. Or if relation is "categories", it will find addCategory() and removeCategory().

这篇关于许多关系设定者的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！