Fix return type of jsonSerialize and add toString on models

src/Model.php

@@ -27,8 +27,9 @@
 use Illuminate\Support\Str;
 use Illuminate\Support\Traits\ForwardsCalls;
 use JsonException;
+use Stringable;
 
-abstract class Model implements Arrayable, ArrayAccess, Jsonable, UrlRoutable
+abstract class Model implements Arrayable, ArrayAccess, Jsonable, Stringable, UrlRoutable
 {
     use Bootable;
     use ForwardsCalls;
@@ -583,11 +584,19 @@ public function toJson(mixed $options = 0): string
     /**
      * Convert the object into something JSON serializable.
      */
-    public function jsonSerialize(): mixed
+    public function jsonSerialize(): array
     {
         return $this->toArray();
     }
 
+    /**
+     * Convert the model to its string representation.
+     */
+    public function __toString(): string
+    {
+        return $this->toJson();
+    }
+
     /**
      * Dynamically retrieve attributes on the model.
      */

tests/ModelTest.php

@@ -314,3 +314,11 @@
 
     expect($model->toJson())->toBe(json_encode($model->toArray()));
 });
+
+it('can be converted to string', function () {
+    $model = ModelStub::create([
+        'name' => 'John Doe',
+    ]);
+
+    expect((string) $model)->toBe(json_encode($model->toArray()));
+});