Element.php

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<?php
namespace Magento\Eav\Model\ResourceModel\Form;

class Element extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected function _construct()
    {
        $this->_init('eav_form_element', 'element_id');
        $this->addUniqueField(
            ['field' => ['type_id', 'attribute_id'], 'title' => __('Form Element with the same attribute')]
        );
    }

    protected function _getLoadSelect($field, $value, $object)
    {
        $select = parent::_getLoadSelect($field, $value, $object);
        $select->join(
            $this->getTable('eav_attribute'),
            $this->getTable('eav_attribute') . '.attribute_id = ' . $this->getMainTable() . '.attribute_id',
            ['attribute_code', 'entity_type_id']
        );

        return $select;
    }
}