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Need to create an admin grid on Magento 2 with data of two custom tables of different structures.

FYI, unable to proceed with joins and union.

Can you please anyone provide the best solution to achieve this?.

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Follow the instructions mentioned in this article to create the grid.

Now, follow these steps:

  1. To join, you have to add the following codes in di.xml file:

    <?xml version="1.0"?>
    <!--
        /**
         * Webkul Grid DI
         *
         * @category    Webkul
         * @package     Webkul_Grid
         * @author      Webkul Software Private Limited
         *
         */
     -->
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
        <!-- here we remove virtualType and defile collection as follow-->
        <type name="Webkul\Grid\Model\ResourceModel\Grid\Grid\Collection">
            <arguments>
                <argument name="mainTable" xsi:type="string">wk_grid_records</argument>
                <argument name="eventPrefix" xsi:type="string">wk_records_grid_collection</argument>
                <argument name="eventObject" xsi:type="string">wk_grid_records_collection</argument>
                <argument name="resourceModel" xsi:type="string">Webkul\Grid\Model\ResourceModel\Grid</argument>
            </arguments>
        </type>
        <type name="Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory">
            <arguments>
                <argument name="collections" xsi:type="array">
                    <!--data provider name which used in grid ui component file -->
                    <item name="grid_record_grid_list_data_source" xsi:type="string">Webkul\Grid\Model\ResourceModel\Grid\Grid\Collection</item>
                </argument>
            </arguments>
        </type>
    </config>
    
  2. Then you have to update Collection.php file in app/code/Webkul/Grid/Model/ResourceModel/Grid/Collection.php with the following codes:

    /**
     * Webkul Grid collection
     *
     * @category    Webkul
     * @package     Webkul_Grid
     * @author      Webkul Software Private Limited
     *
     */
    
     namespace Webkul\Grid\Model\ResourceModel\Grid;
    
     /* use required classes */
     use Magento\Framework\Data\Collection\EntityFactoryInterface;
     use Psr\Log\LoggerInterface;
     use Magento\Framework\Data\Collection\Db\FetchStrategyInterface;
     use Magento\Framework\Event\ManagerInterface;
     use Magento\Store\Model\StoreManagerInterface;
     use Magento\Framework\DB\Adapter\AdapterInterface;
     use Magento\Framework\Model\ResourceModel\Db\AbstractDb;
    
     class Collection extends 
     \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
     {
     /**
     * @var string
     */
     protected $_idFieldName = 'entity_id';
    
    /**
     * @param EntityFactoryInterface $entityFactory,
     * @param LoggerInterface        $logger,
     * @param FetchStrategyInterface $fetchStrategy,
     * @param ManagerInterface       $eventManager,
     * @param StoreManagerInterface  $storeManager,
     * @param AdapterInterface       $connection,
     * @param AbstractDb             $resource
     */
    public function __construct(
        EntityFactoryInterface $entityFactory,
        LoggerInterface $logger,
        FetchStrategyInterface $fetchStrategy,
        ManagerInterface $eventManager,
        StoreManagerInterface $storeManager,
        AdapterInterface $connection = null,
        AbstractDb $resource = null
    ) {
        $this->_init('Webkul\Grid\Model\Grid', 'Webkul\Grid\Model\ResourceModel\Grid');
        //Class naming structure 
        // 'NameSpace\ModuleName\Model\ModelName', 'NameSpace\ModuleName\Model\ResourceModel\ModelName'
        parent::__construct($entityFactory, $logger, $fetchStrategy, $eventManager, $connection, $resource);
        $this->storeManager = $storeManager;
    }
    
    protected function _initSelect()
    {
        parent::_initSelect();
    
        $this->getSelect()->joinLeft(
            ['secondTable' => $this->getTable('wk_record_temp')], //2nd table name by which you want to join mail table
            'main_table.record_id = secondTable.record_id', // common column which available in both table 
            '*' // '*' define that you want all column of 2nd table. if you want some particular column then you can define as ['column1','column2']
        );
        }
    
        }
    
  3. Create Collection.php file in app/code/Webkul/Grid/Model/ResourceModel/Grid/Grid.
  4. Now, you can add 2nd table columns in grid_record_grid_list.xml in app/code/Webkul/Grid/view/adminhtml/ui_component folder.

You can find more information about these steps right here.

  • thanks a lot !!!! Working superb !!!! But how can I add custom query in collection of multiple custom tables?. – Ejilarasan J Jan 23 at 9:37

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