Collection.php

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

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

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

    protected $_eventPrefix = 'cms_block_collection';

    protected $_eventObject = 'block_collection';

    protected function _afterLoad()
    {
        $entityMetadata = $this->metadataPool->getMetadata(BlockInterface::class);

        $this->performAfterLoad('cms_block_store', $entityMetadata->getLinkField());

        return parent::_afterLoad();
    }

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

    public function toOptionArray()
    {
        return $this->_toOptionArray('block_id', 'title');
    }

    public function addStoreFilter($store, $withAdmin = true)
    {
        $this->performAddStoreFilter($store, $withAdmin);

        return $this;
    }

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