Gsyfuy

I'm trying to follow Magento's tutorial for adding an extension attribute. I want to add an extension attribute called "exportedFlag" to the Invoice class, and have it returned through the V1/invoices/ API method.

Here's my API call

http://magento.test/rest/V1/invoices/?
searchCriteria[filter_groups][0][filters][0][field]=store_id&
searchCriteria[filter_groups][0][filters][0][value]=1&
searchCriteria[filter_groups][0][filters][0][condition_type]=eq

Here's the error I'm getting:

Fatal Error: 'Uncaught TypeError: Argument 2 passed to 

MyCompany\Invoice\Model\Plugin\Invoice\Repository::afterGetList() 

must be an instance of Magento\Framework\Api\SearchResults, 

instance of Magento\Sales\Model\ResourceModel\Order\Invoice\Collection given, 

called in /var/www/magento2/lib/internal/Magento/Framework/Interception/Interceptor.php 

on line 146 and defined in 

/var/www/magento2/app/code/MyCompany/Invoice/Model/Plugin/Invoice/Repository.php:53

Stack trace: 

#0 /var/www/magento2/lib/internal/Magento/Framework/Interception/Interceptor.php(146): 

MyCompany\Invoice\Model\Plugin\Invoice\Repository->afterGetList(Object(Magento\Sales\Model\Order\InvoiceRepository\Interceptor), 

Object(Magento\Sales\Model\ResourceModel\Order\Invoice\Collection), 

Object(Magento\Framework\Api\SearchCriteria))

#1 /var/www/magento2/lib/internal/Magento/Framework/Interception/Interceptor.php(153): 

Magento\Sales\Model\Order\InvoiceRepository\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\Api\SearchCriteria))

#2 /var/www/mag' in '/var/www/magento2/app/code/MyCompany/Invoice/Model/Plugin/Invoice/Repository.php' on line 53

Here's the relevant code

/**

 * Class Repository

 * @package MyCompanyInvoiceModelPluginInvoice

 */

class Repository

{

    /**

     * Adds the "exported flag" to invoice extension attributes.

     *

     * @param MagentoSalesApiInvoiceRepositoryInterface $subject

     * @param MagentoFrameworkApiSearchCriteriaInterface $searchCriteria

     * @return MagentoFrameworkApiSearchResults

     */

    public function afterGetList

    (

        MagentoSalesApiInvoiceRepositoryInterface $subject,

        MagentoFrameworkApiSearchResults $searchResult

    ) {

        /** @var MagentoCatalogApiDataInvoiceInterface $invoice */

        foreach ($searchResult->getItems() as $invoice) {

            $this->addExportedFlagToInvoice($invoice);

        }

        return $searchResult;

    }  

}  

For reference, here's the comparable bit of code from Magento's Github example

/**

 * Class Repository

 * @package MyCompanyInvoiceModelPluginInvoice

 */

class Repository

{

    /**

     * Add Social Links to product extension attributes

     *

     * @param MagentoCatalogApiProductRepositoryInterface $subject

     * @param MagentoFrameworkApiSearchCriteriaInterface $searchCriteria

     * @return MagentoFrameworkApiSearchResults

     */

    public function afterGetList

    (

        MagentoCatalogApiProductRepositoryInterface $subject,

        MagentoFrameworkApiSearchResults $searchResult

    ) {

        /** @var MagentoCatalogApiDataProductInterface $product */

        foreach ($searchResult->getItems() as $product) {

            $this->addExternalLinksToProduct($product);

        }

        return $searchResult;

    }

}

Why is Magento passing an instance of Magento\Sales\Model\ResourceModel\Order\Invoice\Collection as my second parameter to afterGetList, when Magento's example shows that the second parameter should be MagentoFrameworkApiSearchResults?