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class CiwDataProvider extends \Bitrix\Crm\Integration\DocumentGenerator\DataProvider\Dynamic  implements Nameable
{

public static function getEntityTypeId(){
    return 144;
}


public function getFields(): array  {
      ....
}

public function isLoaded(): bool
    {
        return $this->data !== null;
        return true;
    }
   public static function getLangName()
        {
            return 'My provider';
        }

}

namespace MyDocumentProvider;

use Bitrix\Crm\Binding\EntityContactTable;
use Bitrix\Crm\Integration\DocumentGenerator\Value\Money;
use Bitrix\Crm\Item;
use Bitrix\Crm\Service\Container;
use Bitrix\Crm\Service\Factory;
use Bitrix\Crm\StatusTable;
use Bitrix\DocumentGenerator\DataProvider\ArrayDataProvider;
use Bitrix\DocumentGenerator\DataProvider\Filterable;
use Bitrix\DocumentGenerator\DataProvider\User;
use Bitrix\DocumentGenerator\DataProviderManager;
use Bitrix\Main\IO\Path;
use Bitrix\Main\Localization\Loc;
use Bitrix\Main\Loader;
use Bitrix\Crm\Service;
use Bitrix\DocumentGenerator\Nameable;

Loader::includeModule('documentgenerator');


class CiwDataProvider extends \Bitrix\DocumentGenerator\DataProvider  implements Nameable
{
    public function getFields(): array
    {
        if($this->fields === null)
        {
            parent::getFields();

            $this->fields['APPROVAL_LIST'] = [
                'TITLE' => 'Лист голосования',
                'PROVIDER' => ArrayDataProvider::class,
                'OPTIONS' => [
                    'ITEM_PROVIDER' => \MyDocumentProvider\CiwGroupDataProvider::class,
                    'ITEM_NAME' => 'APPROVAL_GROUP',
                    'ITEM_TITLE' => 'Лист голосования'
                ],
                'VALUE' => [
                    $this,
                    'getApprovalSheetGroups'
                ]
            ];

            $this->fields['ORDER_NUMBER_MY'] = [
                'TITLE' => 'Cool Fields',
                'VALUE' => [
                    $this, 'getUniqueFieldValue',
                ],
            ];
        }
        
        return $this->fields;
    }
    
    public function getUniqueFieldValue()
    {
        return 'unique_value';
    }

   public function getApprovalSheetGroups(): array
    {
        $objectsGroups = [];

        foreach (self::getListApprovalGroups($this->source) as $arObjectGroup) {
            $obObjectGroup = new \MyDocumentProvider\CiwGroupDataProvider($arObjectGroup);
            $obObjectGroup->setParentProvider($this);
            $objectsGroups[] = $obObjectGroup;
        }
        return $objectsGroups;
    }

   private function getListApprovalGroups(string $documentId): array

    {
        return [
            "1",
            "2",
            "3",
            "4",
            "5"
        ];
    }

 public function isLoaded(): bool
    {
        return $this->data !== null;
        return true;
    }
   public static function getLangName()
        {
            return 'My provider';
        }

}

    public static function onDataProviderManagerFillSubstitutionProviders(\Bitrix\Main\Event $event) {
        
        $result = [];
        
        if(\Bitrix\Main\Loader::includeModule('crm'))
        {
            $result = [
                Bitrix\Crm\Integration\DocumentGenerator\DataProvider\Dynamic144::class => \MyDocumentProvider\CiwDataProvider::class,
            ];
        }
        return new \Bitrix\Main\EventResult(\Bitrix\Main\EventResult::SUCCESS, $result);
        
    }

    public static function onGetDataProviderList(): array
    {
        $result[\MyDocumentProvider\CiwDataProvider::class] = [
            'NAME' => 'Провайдер',
            'CLASS' => \MyDocumentProvider\CiwDataProvider::class,
            'MODULE' => 'documentgenerator'
        ];

 

        return $result;
    }