Extend readme

digital-craftsman-de · Jun 8, 2024 · 06ae38c · 06ae38c
1 parent 1fd277f
commit 06ae38c
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diff --git a/README.md b/README.md
@@ -52,10 +52,19 @@ if ($userId->isEqualTo($command->userId)) {
 }
 ```
 
+Guard against invalid usages:
 ```php
 $requestingUser->userId->mustNotBeEqualTo($command->targetUserId);
 ```
 
+Or with a custom exception:
+```php
+$requestingUser->userId->mustNotBeEqualTo(
+    $command->targetUserId,
+    static fn () => new Exception\UserCanNotTargetItself(),
+);
+```
+
 ### Symfony serializer
 
 If you're injecting the `SerializerInterface` directly, there is nothing to do. The normalizer for the id is automatically registered.