filter posts without sale

src/ApiResource/PostingApi.php

@@ -7,6 +7,7 @@
 
 namespace App\ApiResource;
 
+use ApiPlatform\Doctrine\Orm\Filter\ExistsFilter;
 use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
 use ApiPlatform\Doctrine\Orm\State\Options;
 use ApiPlatform\Metadata\ApiFilter;
@@ -54,6 +55,7 @@ use Symfony\Component\Validator\Constraints\NotBlank;
     stateOptions: new Options(entityClass: Posting::class)
 )]
 #[ApiFilter(SearchFilter::class, properties: ['partner' => 'exact', 'contact' => 'exact'])]
+#[ApiFilter(ExistsFilter::class, properties: ['contact', 'sale'])]
 class PostingApi implements OwnerInterface
 {
     #[ApiProperty(readable: false, writable: false, identifier: true)]