Hjdcti

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?