Collection.php

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<?php
namespace Magento\Cms\Model\ResourceModel\Page;

use Magento\Cms\Api\Data\PageInterface;
use \Magento\Cms\Model\ResourceModel\AbstractCollection;

class Collection extends AbstractCollection
{
    protected $_idFieldName = 'page_id';

    protected $_previewFlag;

    protected $_eventPrefix = 'cms_page_collection';

    protected $_eventObject = 'page_collection';

    protected function _construct()
    {
        $this->_init(\Magento\Cms\Model\Page::class, \Magento\Cms\Model\ResourceModel\Page::class);
        $this->_map['fields']['page_id'] = 'main_table.page_id';
        $this->_map['fields']['store'] = 'store_table.store_id';
    }

    public function setFirstStoreFlag($flag = false)
    {
        $this->_previewFlag = $flag;
        return $this;
    }

    public function addStoreFilter($store, $withAdmin = true)
    {
        if (!$this->getFlag('store_filter_added')) {
            $this->performAddStoreFilter($store, $withAdmin);
        }
        return $this;
    }

    protected function _afterLoad()
    {
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);
        $this->performAfterLoad('cms_page_store', $entityMetadata->getLinkField());
        $this->_previewFlag = false;

        return parent::_afterLoad();
    }

    protected function _renderFiltersBefore()
    {
        $entityMetadata = $this->metadataPool->getMetadata(PageInterface::class);
        $this->joinStoreRelationTable('cms_page_store', $entityMetadata->getLinkField());
    }
}