Sonata Admin (2.3) 中的嵌套集合字段

我在创建用于创建课程的表单时遇到问题。这是我的数据库方案的一部分，我正在尝试为其创建一个表单：

所以我想做的是创建一个课程，我可以在其中创建会话和附加到该会话的日期（时刻）。它应该看起来像这样：

In my 课程管理我有的课：

protected function configureFormFields(FormMapper $formMapper)
{
    $formMapper
        ->add('name',                   'text',         array('label' => 'Naam'))
        ->add('description',            'textarea',     array('label' => 'Beschrijving'))
        ->add('materials',              'textarea',     array('label' => 'Benodigde materialen'))
        ->add('numberOfParticipants',   'number',       array('label' => 'Aantal deelnembers'))
        ->add('numberOfDays',           'number',       array('label' => 'Aantal dagen'))
        ->add('price',                  'number',       array('label' => 'Prijs'))
        ->add('priceKmo',               'number',       array('label' => 'KMO-portefeuille Prijs'))

        ->add('location', 'sonata_type_model', array('expanded' => true, 'by_reference' => false, 'multiple' => true, 'btn_add' => false))

        ->add('session', 'sonata_type_collection', array(
            'by_reference' => false,
            'type_options' => array(
                // Prevents the "Delete" option from being displayed
                'delete' => false,
                'delete_options' => array(
                    // You may otherwise choose to put the field but hide it
                    'type'         => 'hidden',
                    // In that case, you need to fill in the options as well
                    'type_options' => array(
                        'mapped'   => false,
                        'required' => false,
                    )
                )
            )
        ), array(
            'edit' => 'inline',
            'inline' => 'table',
            'sortable' => 'position'
        ))
    ;
}

In my 会话管理我有的课：

protected function configureFormFields(FormMapper $formMapper)
{
    $formMapper
        ->add('type',      'text',     array('label' => 'Type opleiding (Dag / Avond)'))
        ->add('moment', 'sonata_type_collection', array(
            'by_reference' => false,
            'type_options' => array(
                // Prevents the "Delete" option from being displayed
                'delete' => false,
                'delete_options' => array(
                    // You may otherwise choose to put the field but hide it
                    'type'         => 'hidden',
                    // In that case, you need to fill in the options as well
                    'type_options' => array(
                        'mapped'   => false,
                        'required' => false,
                    )
                )
            )
        ), array(
            'edit' => 'inline',
            'inline' => 'table',
            'sortable' => 'position'
        ))
        ;
}

而在我的时刻管理我有的课：

protected function configureFormFields(FormMapper $formMapper)
{
    $formMapper
        ->add('time',      'date',     array('label' => 'Datum'))
    ;
}

我的表单中的问题是，当我尝试在会话中添加时刻（日期）时，出现以下错误：

FatalErrorException：错误：在 /myproject/app/cache/dev/classes.php 第 9772 行中对 null 调用成员函数 getName()

因此，我可以添加一个会话，但是当我尝试在会话中添加一个时刻时，我收到错误...。

当我查看文件时类.php规则 9771 和 9772 中有：

$childFormBuilder = $this->getChildFormBuilder($formBuilder, $elementId);
$fieldDescription = $admin->getFormFieldDescription($childFormBuilder->getName());

The $childFormBuilder is null.

当我查看该函数时，我得到了这个：

public function getChildFormBuilder(FormBuilder $formBuilder, $elementId)
{
    foreach (new FormBuilderIterator($formBuilder) as $name => $formBuilder) {
        if ($name == $elementId) {
            return $formBuilder;
        }
    }
    return;
}

当我像这样执行 $name 和 $elementId 的 var_dump 时：

public function getChildFormBuilder(FormBuilder $formBuilder, $elementId)
{
    foreach (new FormBuilderIterator($formBuilder) as $name => $formBuilder) {
        var_dump("name: " . $name);
        var_dump("elementId: " . $elementId);

        if ($name == $elementId) {
            return $formBuilder;
        }
    } 
    die;
    return;
}

然后按下添加新按钮，如下图所示：

然后我得到这个输出：

name: s56cda71d2daa0_name
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_description
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_materials
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_numberOfParticipants
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_numberOfDays
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_price
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_priceKmo
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_location
elementId: s56cda71d2daa0_session_0_moment

name: s56cda71d2daa0_session
elementId: s56cda71d2daa0_session_0_moment

在我的所有实体中，我都有一个 __toString 函数。我的课程实体中的一个示例：

public function __toString()
{
    if(!is_null($this->name))
    {
        return $this->name;
    }
    else{
        return "";
    }
}

这里可能有什么问题？我真的被这个问题困扰了。我还发布了一个issue http://github.com/sonata-project/SonataAdminBundle/issues/3583在 Sonata Admin 的 github 存储库上，但没有答案......

我的实体:

课程实体:

<?php

namespace Studyx\EnrolmentBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Course
 *
 * @ORM\Table(name="course")
 * @ORM\Entity
 */
class Course
{
    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;

    /**
     * @var string
     *
     * @ORM\Column(name="description", type="text", nullable=false)
     */
    private $description;

    /**
     * @var string
     *
     * @ORM\Column(name="materials", type="text", nullable=true)
     */
    private $materials;

    /**
     * @var integer
     *
     * @ORM\Column(name="number_of_participants", type="integer", nullable=true)
     */
    private $numberOfParticipants;

    /**
     * @var integer
     *
     * @ORM\Column(name="number_of_days", type="integer", nullable=true)
     */
    private $numberOfDays;

    /**
     * @var string
     *
     * @ORM\Column(name="price", type="decimal", nullable=true)
     */
    private $price;

    /**
     * @var string
     *
     * @ORM\Column(name="price_kmo", type="decimal", nullable=true)
     */
    private $priceKmo;

    /**
     * @var integer
     *
     * @ORM\Column(name="ID", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(targetEntity="Studyx\EnrolmentBundle\Entity\Location", inversedBy="course")
     * @ORM\JoinTable(name="course_has_location",
     *   joinColumns={
     *     @ORM\JoinColumn(name="course_ID", referencedColumnName="ID")
     *   },
     *   inverseJoinColumns={
     *     @ORM\JoinColumn(name="location_ID", referencedColumnName="ID")
     *   }
     * )
     */
    private $location;

    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\OneToMany(targetEntity="Studyx\EnrolmentBundle\Entity\Session", mappedBy="course")
     */
    private $session;

    /**
     * Add session
     *
     * @param \Studyx\EnrolmentBundle\Entity\Session $session
     * @return Session
     */
    public function addSession(\Studyx\EnrolmentBundle\Entity\Session $session)
    {
        $this->session[] = $session;

        return $this;
    }

    /**
     * Remove session
     *
     * @param \Studyx\EnrolmentBundle\Entity\Session $session
     */
    public function removeSession(\Studyx\EnrolmentBundle\Entity\Session $session)
    {
        $this->session->removeElement($session);
    }

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

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->location = new \Doctrine\Common\Collections\ArrayCollection();
    }

    public function __toString()
    {
        if(!is_null($this->name))
        {
            return $this->name;
        }
        else{
            return "";
        }
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Course
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set description
     *
     * @param string $description
     * @return Course
     */
    public function setDescription($description)
    {
        $this->description = $description;

        return $this;
    }

    /**
     * Get description
     *
     * @return string 
     */
    public function getDescription()
    {
        return $this->description;
    }

    /**
     * Set materials
     *
     * @param string $materials
     * @return Course
     */
    public function setMaterials($materials)
    {
        $this->materials = $materials;

        return $this;
    }

    /**
     * Get materials
     *
     * @return string 
     */
    public function getMaterials()
    {
        return $this->materials;
    }

    /**
     * Set numberOfParticipants
     *
     * @param integer $numberOfParticipants
     * @return Course
     */
    public function setNumberOfParticipants($numberOfParticipants)
    {
        $this->numberOfParticipants = $numberOfParticipants;

        return $this;
    }

    /**
     * Get numberOfParticipants
     *
     * @return integer 
     */
    public function getNumberOfParticipants()
    {
        return $this->numberOfParticipants;
    }

    /**
     * Set numberOfDays
     *
     * @param integer $numberOfDays
     * @return Course
     */
    public function setNumberOfDays($numberOfDays)
    {
        $this->numberOfDays = $numberOfDays;

        return $this;
    }

    /**
     * Get numberOfDays
     *
     * @return integer 
     */
    public function getNumberOfDays()
    {
        return $this->numberOfDays;
    }

    /**
     * Set price
     *
     * @param string $price
     * @return Course
     */
    public function setPrice($price)
    {
        $this->price = $price;

        return $this;
    }

    /**
     * Get price
     *
     * @return string 
     */
    public function getPrice()
    {
        return $this->price;
    }

    /**
     * Set priceKmo
     *
     * @param string $priceKmo
     * @return Course
     */
    public function setPriceKmo($priceKmo)
    {
        $this->priceKmo = $priceKmo;

        return $this;
    }

    /**
     * Get priceKmo
     *
     * @return string 
     */
    public function getPriceKmo()
    {
        return $this->priceKmo;
    }

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Add location
     *
     * @param \Studyx\EnrolmentBundle\Entity\Location $location
     * @return Course
     */
    public function addLocation(\Studyx\EnrolmentBundle\Entity\Location $location)
    {
        $this->location[] = $location;

        return $this;
    }

    /**
     * Remove location
     *
     * @param \Studyx\EnrolmentBundle\Entity\Location $location
     */
    public function removeLocation(\Studyx\EnrolmentBundle\Entity\Location $location)
    {
        $this->location->removeElement($location);
    }

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

会话实体:

    <?php

namespace Studyx\EnrolmentBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Session
 *
 * @ORM\Table(name="session")
 * @ORM\Entity
 */
class Session
{
    /**
     * @var string
     *
     * @ORM\Column(name="type", type="string", length=45, nullable=false)
     */
    private $type;

    /**
     * @var integer
     *
     * @ORM\Column(name="ID", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @var \Studyx\EnrolmentBundle\Entity\Course
     *
     * @ORM\ManyToOne(targetEntity="Studyx\EnrolmentBundle\Entity\Course", inversedBy="session")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="course_ID", referencedColumnName="ID")
     * })
     */
    private $course;

    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\OneToMany(targetEntity="Studyx\EnrolmentBundle\Entity\Moment", mappedBy="session")
     */
    private $moment;

    /**
     * Add moment
     *
     * @param \Studyx\EnrolmentBundle\Entity\Moment $moment
     * @return Moment
     */
    public function addMoment(\Studyx\EnrolmentBundle\Entity\Moment $moment)
    {
        $this->moment[] = $moment;

        return $this;
    }

    /**
     * Remove moment
     *
     * @param \Studyx\EnrolmentBundle\Entity\Moment $moment
     */
    public function removeMoment(\Studyx\EnrolmentBundle\Entity\Moment $moment)
    {
        $this->moment->removeElement($moment);
    }

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

    public function __toString()
    {
        if(!is_null($this->type))
        {
            return $this->type;
        }
        else{
            return "";
        }
    }

    /**
     * Set type
     *
     * @param string $type
     * @return Session
     */
    public function setType($type)
    {
        $this->type = $type;

        return $this;
    }

    /**
     * Get type
     *
     * @return string 
     */
    public function getType()
    {
        return $this->type;
    }

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set course
     *
     * @param \Studyx\EnrolmentBundle\Entity\Course $course
     * @return Session
     */
    public function setCourse(\Studyx\EnrolmentBundle\Entity\Course $course = null)
    {
        $this->course = $course;

        return $this;
    }

    /**
     * Get course
     *
     * @return \Studyx\EnrolmentBundle\Entity\Course 
     */
    public function getCourse()
    {
        return $this->course;
    }
}

矩实体:

<?php

namespace Studyx\EnrolmentBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Moment
 *
 * @ORM\Table(name="moment")
 * @ORM\Entity
 */
class Moment
{
    /**
     * @var \DateTime
     *
     * @ORM\Column(name="time", type="datetime", nullable=false)
     */
    private $time;

    /**
     * @var integer
     *
     * @ORM\Column(name="ID", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @var \Studyx\EnrolmentBundle\Entity\Session
     *
     * @ORM\ManyToOne(targetEntity="Studyx\EnrolmentBundle\Entity\Session")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="session_ID", referencedColumnName="ID")
     * })
     */
    private $session;

    public function __toString()
    {
        if(!is_null($this->time))
        {
            return $this->time;
        }
        else{
            return "";
        }
    }



    /**
     * Set time
     *
     * @param \DateTime $time
     * @return Moment
     */
    public function setTime($time)
    {
        $this->time = $time;

        return $this;
    }

    /**
     * Get time
     *
     * @return \DateTime 
     */
    public function getTime()
    {
        return $this->time;
    }

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set session
     *
     * @param \Studyx\EnrolmentBundle\Entity\Session $session
     * @return Moment
     */
    public function setSession(\Studyx\EnrolmentBundle\Entity\Session $session = null)
    {
        $this->session = $session;

        return $this;
    }

    /**
     * Get session
     *
     * @return \Studyx\EnrolmentBundle\Entity\Session 
     */
    public function getSession()
    {
        return $this->session;
    }
}

UPDATE:

我在我的函数中添加了一些 var_dumps获取ChildFormBuilder像这样：

public function getChildFormBuilder(FormBuilder $formBuilder, $elementId)
{
    foreach (new FormBuilderIterator($formBuilder) as $name => $formBuilder) {
        if ($name == $elementId) {
            return $formBuilder;
        }
    }

    var_dump(__METHOD__);
    var_dump($elementId);
    var_dump(debug_backtrace());

    return;
}

结果是这样的：

string 'Sonata\AdminBundle\Admin\AdminHelper::getChildFormBuilder' (length=57)
string 's56cdfa72c4dea_session_0_moment' (length=31)
array (size=8)
  0 => 
    array (size=7)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/app/cache/dev/classes.php' (length=69)
      'line' => int 9774
      'function' => string 'getChildFormBuilder' (length=19)
      'class' => string 'Sonata\AdminBundle\Admin\AdminHelper' (length=36)
      'object' => 
        object(Sonata\AdminBundle\Admin\AdminHelper)[339]
          protected 'pool' => 
            object(Sonata\AdminBundle\Admin\Pool)[104]
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=2)
          0 => 
            object(Symfony\Component\Form\FormBuilder)[436]
              ...
          1 => &string 's56cdfa72c4dea_session_0_moment' (length=31)
  1 => 
    array (size=7)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/vendor/sonata-project/admin-bundle/Controller/HelperController.php' (length=110)
      'line' => int 95
      'function' => string 'appendFormFieldElement' (length=22)
      'class' => string 'Sonata\AdminBundle\Admin\AdminHelper' (length=36)
      'object' => 
        object(Sonata\AdminBundle\Admin\AdminHelper)[339]
          protected 'pool' => 
            object(Sonata\AdminBundle\Admin\Pool)[104]
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=3)
          0 => 
            object(Studyx\EnrolmentBundle\Admin\CourseAdmin)[370]
              ...
          1 => 
            object(Studyx\EnrolmentBundle\Entity\Course)[415]
              ...
          2 => &string 's56cdfa72c4dea_session_0_moment' (length=31)
  2 => 
    array (size=5)
      'function' => string 'appendFormFieldElementAction' (length=28)
      'class' => string 'Sonata\AdminBundle\Controller\HelperController' (length=46)
      'object' => 
        object(Sonata\AdminBundle\Controller\HelperController)[244]
          protected 'twig' => 
            object(Twig_Environment)[220]
              ...
          protected 'helper' => 
            object(Sonata\AdminBundle\Admin\AdminHelper)[339]
              ...
          protected 'pool' => 
            object(Sonata\AdminBundle\Admin\Pool)[104]
              ...
          protected 'validator' => 
            object(Symfony\Component\Validator\Validator)[340]
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=1)
          0 => 
            object(Symfony\Component\HttpFoundation\Request)[6]
              ...
  3 => 
    array (size=4)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/app/bootstrap.php.cache' (length=67)
      'line' => int 2957
      'function' => string 'call_user_func_array' (length=20)
      'args' => 
        array (size=2)
          0 => &
            array (size=2)
              ...
          1 => &
            array (size=1)
              ...
  4 => 
    array (size=7)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/app/bootstrap.php.cache' (length=67)
      'line' => int 2931
      'function' => string 'handleRaw' (length=9)
      'class' => string 'Symfony\Component\HttpKernel\HttpKernel' (length=39)
      'object' => 
        object(Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel)[300]
          protected 'container' => 
            object(appDevDebugProjectContainer)[304]
              ...
          protected 'dispatcher' => 
            object(Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher)[299]
              ...
          protected 'resolver' => 
            object(Symfony\Component\HttpKernel\Controller\TraceableControllerResolver)[249]
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=2)
          0 => 
            object(Symfony\Component\HttpFoundation\Request)[6]
              ...
          1 => &int 1
  5 => 
    array (size=7)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/app/bootstrap.php.cache' (length=67)
      'line' => int 3060
      'function' => string 'handle' (length=6)
      'class' => string 'Symfony\Component\HttpKernel\HttpKernel' (length=39)
      'object' => 
        object(Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel)[300]
          protected 'container' => 
            object(appDevDebugProjectContainer)[304]
              ...
          protected 'dispatcher' => 
            object(Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher)[299]
              ...
          protected 'resolver' => 
            object(Symfony\Component\HttpKernel\Controller\TraceableControllerResolver)[249]
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=3)
          0 => 
            object(Symfony\Component\HttpFoundation\Request)[6]
              ...
          1 => &int 1
          2 => &boolean true
  6 => 
    array (size=7)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/app/bootstrap.php.cache' (length=67)
      'line' => int 2333
      'function' => string 'handle' (length=6)
      'class' => string 'Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel' (length=73)
      'object' => 
        object(Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel)[300]
          protected 'container' => 
            object(appDevDebugProjectContainer)[304]
              ...
          protected 'dispatcher' => 
            object(Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher)[299]
              ...
          protected 'resolver' => 
            object(Symfony\Component\HttpKernel\Controller\TraceableControllerResolver)[249]
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=3)
          0 => 
            object(Symfony\Component\HttpFoundation\Request)[6]
              ...
          1 => &int 1
          2 => &boolean true
  7 => 
    array (size=7)
      'file' => string '/Applications/MAMP/htdocs/studyx_enrolments/web/app_dev.php' (length=59)
      'line' => int 29
      'function' => string 'handle' (length=6)
      'class' => string 'Symfony\Component\HttpKernel\Kernel' (length=35)
      'object' => 
        object(AppKernel)[5]
          protected 'bundles' => 
            array (size=22)
              ...
          protected 'bundleMap' => 
            array (size=22)
              ...
          protected 'container' => 
            object(appDevDebugProjectContainer)[304]
              ...
          protected 'rootDir' => string '/Applications/MAMP/htdocs/studyx_enrolments/app' (length=47)
          protected 'environment' => string 'dev' (length=3)
          protected 'debug' => boolean true
          protected 'booted' => boolean true
          protected 'name' => string 'app' (length=3)
          protected 'startTime' => float 1456339594.61
          protected 'loadClassCache' => 
            array (size=2)
              ...
      'type' => string '->' (length=2)
      'args' => 
        array (size=1)
          0 => 
            object(Symfony\Component\HttpFoundation\Request)[6]
              ...

更新2：

我已将composer.json中的要求更改为“sonata-project/admin-bundle”：“^2.4@dev”并使用composer进行更新。但现在我收到这个错误：

ContextErrorException：警告：非法字符串偏移“admin” app/cache/dev/classes.php 第 10482 行

错误就在这个函数中：

public function getDashboardGroups()
{
    $groups = $this->adminGroups;
    foreach ($this->adminGroups as $name => $adminGroup) {
        if (isset($adminGroup['items'])) {
            foreach ($adminGroup['items'] as $key => $item) {
                if (''!= $item['admin']) {
                    $admin = $this->getInstance($item['admin']);
                    if ($admin->showIn(Admin::CONTEXT_DASHBOARD)) {
                        $groups[$name]['items'][$key] = $admin;
                    } else {
                        unset($groups[$name]['items'][$key]);
                    }
                } 
                else {
                    unset($groups[$name]['items'][$key]);
                }
            }
        }
        if (empty($groups[$name]['items'])) {
            unset($groups[$name]);
        }
    }
    return $groups;
}

网上的错误：if (''!= $item['admin']) { .

In my 配置.yml I have:

sonata_admin:
title:      Studyx
title_logo: bundles/studyxenrolment/images/logo.png
templates:
    layout:                 StudyxEnrolmentBundle:Admin:standard_layout.html.twig
    edit:                   StudyxEnrolmentBundle:CRUD:edit.html.twig
    user_block:             StudyxEnrolmentBundle:Admin:user_block.html.twig
#        search:                 SonataAdminBundle:Core:search.html.twig
#        search_result_block:    SonataAdminBundle:Block:block_search_result.html.twig
dashboard:
    groups:
        studyx.admin.group.inschrijvingen:
            label: Inschrijvingen
            items: ~
            item_adds:
                - sonata.admin.enrolment

        studyx.admin.group.algemeen:
            label: Algemeen
            items: ~
            item_adds:
                - sonata.admin.course
                - sonata.admin.student

        studyx.admin.group.extra:
            label: Extra
            items: ~
            item_adds:
                - sonata.admin.location
    blocks:
        -
            position: top
            class: col-md-12
            type: sonata.admin.block.admin_list

所以我认为函数获取仪表板组在那里被称为。

更新3：

In my 作曲家.json我现在有以下内容：

"sonata-project/block-bundle": "~2.3",
"sonata-project/admin-bundle": "^2.4@dev",
"sonata-project/doctrine-orm-admin-bundle": "2.3.*",
"sonata-project/formatter-bundle": "^2.3"

我应该将它们全部更新为^2.4@dev ?

出现此错误的原因是您有两级以上的嵌套集合表单，并且目前任何版本的 sonata-admin 尚不支持它。

From @rande https://github.com/sonata-project/SonataAdminBundle/issues/262#issuecomment-2773237（所有者）和奏鸣曲维护者的问题#262 https://github.com/sonata-project/SonataAdminBundle/issues/262, #1228 https://github.com/sonata-project/SonataAdminBundle/issues/1228, #1327 https://github.com/sonata-project/SonataAdminBundle/issues/1327 and #1971 https://github.com/sonata-project/SonataAdminBundle/pull/1971 :

目前还不支持这个......

你也可以看看这个旧的 PR#1971 https://github.com/sonata-project/SonataAdminBundle/pull/1971这应该只能解决某些用例的问题。

我建议您的解决方案是实施上次打开的 PR 提供的修复#2985 https://github.com/sonata-project/SonataAdminBundle/pull/2985/commits.
由于 PR 未合并，因此您需要告诉 Composer 加载它而不是当前（未按预期工作）版本。 （看作曲家和 VCS https://getcomposer.org/doc/05-repositories.md#loading-a-package-from-a-vcs-repository).

希望PR尽快合并。
在此之前，请随时直接使用它来解决您的问题，就像很多人所做的那样。

UPDATE

The 请求请求#3553 https://github.com/sonata-project/SonataAdminBundle/pull/3553最近已合并并修复了 > 2 层嵌套集合的问题（嵌套在嵌套中）。

要获得固定版本，您必须使用dev-master捆绑包的标签（至少来自提交 926f159 https://github.com/sonata-project/SonataAdminBundle/commit/926f15924f612c75366472d99bedf8c6ca25ea68代表 PR 的合并）。

我尝试了一下，它可以很好地满足以下要求：

// composer.json

"require": {
    "sonata-project/admin-bundle": "^2.4@dev",
     ...
},

我希望您可以轻松升级捆绑包以获得修复。

Update2

显然，您的作曲家没有采用分支的最后更改。
PR 提供的修复#2739 https://github.com/sonata-project/SonataAdminBundle/pull/2739已于 6 天前合并。

要解决最后一个问题（希望），您需要更改中的一个非常短的代码块AddDepencyCallsCompilerPass位于vendor/sonata-project/admin-bundle/DependencyInjection/Compiler/AddDependencyCallsCompilerPass.

在第 95 行，替换这一行：

$groupDefaults[$resolvedGroupName]['items'][] = $id;

对于那些人：

$groupDefaults[$resolvedGroupName]['items'][] = array(
    'admin'        => $id,
    'label'        => !empty($attributes['label']) ? $attributes['label'] : '',
    'route'        => '',
    'route_params' => array(),
);

就像 PR 所做的那样（这是使其正常工作唯一需要的更改）。

我会手动进行修复，因为它是非常新的，几天/几周后，运行以下命令：

composer clear-cache and composer update sonata-project/admin-bundle

您应该在手动添加修复之前尝试一下，也许会添加更改。

另外，您可以使用我在答案开头给出的有关 Composer 和 VCS 的链接，并直接要求修复。这是您自己的欣赏，因为它是目前的解决方案。

最后，请耐心等待，修复程序将很快合并到稳定版本中。