public function updateAction（Request $ request，$ id）{
 $ em = $ this-> getDoctrine（） - > getManager（）; 

 $ entity = $ em-> getRepository（'YourBundle：Category'） - > find（$ id）; 

 if（！$ entity）{
 throw $ this-> createNotFoundException（'Unable to find Category entity。 
} 

 $ editForm = $ this-> createEditForm（$ entity）; 
 $ editForm-> bind（$ request）; 

 if（$ editForm-> isValid（））{
 foreach（$ editForm-> get（'items'） - > getData（） - > getValues（）as $ u）
 $ u-> setCategory（$ entity）; 
 $ em-> flush（）; 

 return $ this-> redirect（$ this-> generateUrl（'category_show'，array（'id'=> $ id）））; 
} 

 return $ this-> render（'YourBundle：Category：edit.html.twig'，array（
'entity'=> $ entity，
'edit_form'=> $ editForm-> createView（），
））; 
} 
 

在Symfony2中，具有inversedBy原则注释的属性的实体是当您要在两个表之间创建新链接时，应采取行动。这就是为什么你可以为一个项目分配一个类别，但不能将项目添加到一个类别。

上面的代码是一个标准的CRUD生成的Symfony2 updateAction 功能。唯一的调整是 foreach ，因此强制将类别分配给您在表单中选择的每个项目。

这是基本的，但它的工作原理/ p>

注意：我没有为类别中的REMOVING项目添加解决方法，但是类似的方法也是如此。希望它有帮助。

编辑：删除项目：

  public function updateAction（Request $ request，$ id）{
 $ em = $ this-> getDoctrine（） - > getManager（）; 

 $ entity = $ em-> getRepository（'YourBundle：Category'） - > find（$ id）; 

 if（！$ entity）{
 throw $ this-> createNotFoundException（'Unable to find Category entity。 

} 
 //新行
 $ before = $ entity-> getItems（） - > getValues（）; 

 $ editForm = $ this-> createEditForm（$ entity）; 
 $ editForm-> bind（$ request）; 

 //新行
 $ after = $ entity-> getItems（） - > getValues（）; 

 if（$ editForm-> isValid（））{
 //新行
 $ UNselected = array_diff（$ before，$ after）; 
 foreach（$ UNselected as $ u）{
 $ u-> setCategory（null）; 
} 

 foreach（$ after as $ u）{
 $ u-> setCategory（$ entity）; 
} 
 //新行 - 结束

 $ em-> flush（）; 

 return $ this-> redirect（$ this-> generateUrl（'category_show'，array（'id'=> $ id）））; 
} 

 return $ this-> render（'YourBundle：Category：edit.html.twig'，array（
'entity'=> $ entity，
'edit_form'=> $ editForm-> createView（），
））; 
} 
 

相同的功能，只包括新行。

array_diff 将在提交之前返回链接到类别实体的项目，而不是在提交之后，然后使用 foreach 再次可以将 null 分配为每个这些项目的类别，即：中断它们之间的链接。

第二个 foreach 与原始答案相同。现在就这样尝试一下，告诉我是否有效。

再次，基本的，再次应该有效。

I want to assign many items to one category. I'm using Symfony 2.6.7.

I'm not at the owning side here. If I open this URI:

/category/2/assign

[x] Item 1
[x] Item 2
(Save Button)

I have the possibility to chose many items with checkboxes.

This is my db table "Item", where I want to connect the both:

id | category_id

It is an OneToMany relation, where One = Category and Many = Items.

How can I assign the both here?

It is already working, when I edit one item and than select a category to this item. Now I'm on the category side and here I want select many items to this one category. Can someone help, please? :-)

public function updateAction(Request $request, $id) {
    $em = $this->getDoctrine()->getManager();

    $entity = $em->getRepository('YourBundle:Category')->find($id);

    if (!$entity) {
        throw $this->createNotFoundException('Unable to find Category entity.');
    }

    $editForm = $this->createEditForm($entity);
    $editForm->bind($request);

    if ($editForm->isValid()) {
        foreach ($editForm->get('items')->getData()->getValues() as $u)
            $u->setCategory($entity);
        $em->flush();

        return $this->redirect($this->generateUrl('category_show', array('id' => $id)));
    }

    return $this->render('YourBundle:Category:edit.html.twig', array(
                'entity' => $entity,
                'edit_form' => $editForm->createView(),
    ));
}

See, In Symfony2 the entity with the property with the inversedBy doctrine comment is the one that is supposed to take action when you want to create a new link between the two tables. That is why you can assign a category to an item but not add items to a category.

The above code is a standard CRUD-generated Symfony2 updateAction function. The only tweak is the foreach, thus forcibly assigning a category to every item you selected in the form.

It's rudimentary but it works.

NOTE: I did not include a workaround for REMOVING items from a category, but a similar approach would do it. Hope it helps.

EDIT: FOR REMOVING ITEMS:

public function updateAction(Request $request, $id) {
        $em = $this->getDoctrine()->getManager();

        $entity = $em->getRepository('YourBundle:Category')->find($id);

        if (!$entity) {
            throw $this->createNotFoundException('Unable to find Category entity.');

        }
        //new line
        $before = $entity->getItems()->getValues();

        $editForm = $this->createEditForm($entity);
        $editForm->bind($request);

        //new line
        $after = $entity->getItems()->getValues();

        if ($editForm->isValid()) {
            //new lines
            $UNselected = array_diff($before, $after);
            foreach ($UNselected as $u) {
                $u->setCategory(null);
            }

            foreach ($after as $u) {
                $u->setCategory($entity);
            }
            //new lines - end

            $em->flush();

            return $this->redirect($this->generateUrl('category_show', array('id' => $id)));
        }

        return $this->render('YourBundle:Category:edit.html.twig', array(
                    'entity' => $entity,
                    'edit_form' => $editForm->createView(),
        ));
    }

Same function, just include the new lines.

array_diff will return the items that were linked to the category entity before the submit and are not after the submit, then with the foreach again you can assign null as each of those items' category, i.e.: break the link between them.

The second foreach does the same as the original answer's. Just try it like this now and tell me if it worked.

Again, rudimentary, again, should work.