Missing required argument $modifiers of Magento\Ui\DataProvider\Modifier\Pool

Question

I have created a custom module. In which I want to use data modifier. I have written this code but it gives the following error:

Missing required argument $modifiers of Magento\Ui\DataProvider\Modifier\Pool

My Code is Like di.xml

<virtualType name="Vendor\Module\Ui\DataProvider\Customer\Form\Modifier\Pool" type="Magento\Ui\DataProvider\Modifier\Pool">
 <arguments>
 <argument name="modifiers" xsi:type="array">
 <item name="customer" xsi:type="array">
 <item name="class" xsi:type="string">Vendor\Module\Ui\DataProvider\Customer\Form\Modifier\Customer</item>
 <item name="sortOrder" xsi:type="number">120</item>
 </item>
 </argument>
 </arguments>
</virtualType>
<type name="Vendor\Module\Ui\DataProvider\Customer\Form\Modifier\CustomerDataProvider">
 <arguments>
 <argument name="pool" xsi:type="object">Vendor\Module\Ui\DataProvider\Customer\Form\Modifier\Pool</argument>
 </arguments>
</type>
<type name="Vendor\ModuleUi\DataProvider\Customer\Form\Modifier\Customer">
 <arguments>
 <argument name="scopeName" xsi:type="string">customer_form.customer_form</argument>
 </arguments>
</type>

CustomerDataProvider.php

namespace Vendor\Module\Ui\DataProvider\Customer\Form;
use Magento\Customer\Model\ResourceModel\Customer\CollectionFactory;
use Magento\Ui\DataProvider\AbstractDataProvider;
use Magento\Ui\DataProvider\Modifier\ModifierInterface;
use Magento\Ui\DataProvider\Modifier\PoolInterface;
/**
 * DataProvider for product edit form
 */
class CustomerDataProvider extends AbstractDataProvider
{
 /**
 * @var PoolInterface
 */
 private $pool;
 /**
 * @param string $name
 * @param string $primaryFieldName
 * @param string $requestFieldName
 * @param CollectionFactory $collectionFactory
 * @param PoolInterface $pool
 * @param array $meta
 * @param array $data
 */
 public function __construct(
 $name,
 $primaryFieldName,
 $requestFieldName,
 CollectionFactory $collectionFactory,
 PoolInterface $pool,
 array $meta = [],
 array $data = []
 ) {
 parent::__construct($name, $primaryFieldName, $requestFieldName, $meta, $data);
 $this->collection = $collectionFactory->create();
 $this->pool = $pool;
 }
 /**
 * {@inheritdoc}
 */
 public function getData()
 {
 /** @var ModifierInterface $modifier */
 foreach ($this->pool->getModifiersInstances() as $modifier) {
 $this->data = $modifier->modifyData($this->data);
 }
 return $this->data;
 }
 /**
 * {@inheritdoc}
 */
 public function getMeta()
 {
 $meta = parent::getMeta();
 /** @var ModifierInterface $modifier */
 foreach ($this->pool->getModifiersInstances() as $modifier) {
 $meta = $modifier->modifyMeta($meta);
 }
 return $meta;
 }
}

modifier file Customer.php

<?php
namespace Vendor\Module\Ui\DataProvider\Customer\Form\Modifier;
use Magento\Ui\DataProvider\Modifier\ModifierInterface;
/**
 * Class Prices
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 */
class Customer implements ModifierInterface
{
 /**
 * {@inheritdoc}
 */
 public function modifyMeta(array $meta)
 {
 return $meta;
 }
 /**
 * {@inheritdoc}
 */
 public function modifyData(array $data)
 {
 return $data;
 }
}

I can't find where it is missing arguments. Please correct way to add modifiers.

Note - I am adding this modifier for customer edit form

Answer 1

Try with following updated code.

namespace Vendor\Module\Ui\DataProvider\Customer\Form;
use Magento\Customer\Model\ResourceModel\Customer\CollectionFactory;
use Magento\Ui\DataProvider\AbstractDataProvider;
use Magento\Ui\DataProvider\Modifier\ModifierInterface;
use Magento\Ui\DataProvider\Modifier\PoolInterface;
/**
 * DataProvider for product edit form
 */
class CustomerDataProvider extends AbstractDataProvider implements PoolInterface
{
 protected $modifiers = [];
 protected $modifiersInstances = [];
 /**
 * @param string $name
 * @param string $primaryFieldName
 * @param string $requestFieldName
 * @param CollectionFactory $collectionFactory
 * @param PoolInterface $pool
 * @param array $meta
 * @param array $data
 */
 public function __construct(
 $name,
 $primaryFieldName,
 $requestFieldName,
 CollectionFactory $collectionFactory,
 array $meta = [],
 array $data = []
 ) {
 parent::__construct($name, $primaryFieldName, $requestFieldName, $meta, $data);
 $this->collection = $collectionFactory->create();
 }
 /**
 * {@inheritdoc}
 */
 public function getData()
 {
 /** @var ModifierInterface $modifier */
 foreach ($this->pool->getModifiersInstances() as $modifier) {
 $this->data = $modifier->modifyData($this->data);
 }
 return $this->data;
 }
 /**
 * {@inheritdoc}
 */
 public function getMeta()
 {
 $meta = parent::getMeta();
 /** @var ModifierInterface $modifier */
 foreach ($this->pool->getModifiersInstances() as $modifier) {
 $meta = $modifier->modifyMeta($meta);
 }
 return $meta;
 } 
 /**
 * Retrieve modifiers
 *
 * @return array
 */
 public function getModifiers()
 {
 return $this->modifiers;
 }
 /**
 * Retrieve modifiers instantiated
 *
 * @return ModifierInterface[]
 * @throws LocalizedException
 */
 public function getModifiersInstances()
 {
 if ($this->modifiersInstances) {
 return $this->modifiersInstances;
 }
 foreach ($this->modifiers as $modifier) {
 if (empty($modifier['class'])) {
 throw new LocalizedException(__('Parameter "class" must be present.'));
 }
 if (empty($modifier['sortOrder'])) {
 throw new LocalizedException(__('Parameter "sortOrder" must be present.'));
 }
 $this->modifiersInstances[$modifier['class']] = $this->factory->create($modifier['class']);
 }
 return $this->modifiersInstances;
 }
}

• Deepak Shinde: Thanks for ans. But where I add this file?
• Deepak Shinde: Where I add this Pool class in my module? at which location? As per my knowledge Pool is virtual class. May be issue in di.xml file.

Answer 2

Your dataprovider namespace is wrong replace following line in your di.xml

<type name="Vendor\Module\Ui\DataProvider\Customer\Form\Modifier\CustomerDataProvider">

with

<type name="Vendor\Module\Ui\DataProvider\Customer\Form\CustomerDataProvider">