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Current File : /var/www/html/app/code/FlipsDigital/TextbookList/Model/Options/TextbookList.php

<?php
namespace FlipsDigital\TextbookList\Model\Options;

class TextbookList implements \Magento\Framework\Option\ArrayInterface
{
    protected $_options;
    protected $_storeManager;
    protected $_objectManager;
    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManagerInterface,
        \Magento\Store\Model\StoreManagerInterface $storeManager
    ) {
        $this->_objectManager = $objectManagerInterface;
        $this->_storeManager = $storeManager;
    }

    public function toOptionArray()
    {
        $this->_options = [];
        array_unshift($this->_options, ['value' => '', 'label' => __('-- Please Select --')]);
        $entityFactory = $this->_objectManager->create(\FlipsDigital\TextbookList\Model\ResourceModel\TextbookList\Collection::class);
        $arrEnities = $entityFactory->addAttributeToSelect('*')
            ->setOrder('id','ASC')
            ->setStore($this->_storeManager->getStore());
        if (count($arrEnities)){
            foreach ($arrEnities as $objEntity){
                $this->_options[] = [
                    'label' => $objEntity->getData('class_name') . ' - ' . $objEntity->getData('group_name'),
                    'value' => $objEntity->getId(),
                ];
            }
        }

        return $this->_options;
    }
}