[12.x] Add a default option when retrieving an enum from data (#55735)

* Add a default option when retrieving an enum from data

* Update InteractsWithData.php

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: elbojoloco

src/Illuminate/Support/Traits/InteractsWithData.php

@@ -312,15 +312,16 @@ public function date($key, $format = null, $tz = null)
      *
      * @param  string  $key
      * @param  class-string<TEnum>  $enumClass
+     * @param  TEnum|null  $default
      * @return TEnum|null
      */
-    public function enum($key, $enumClass)
+    public function enum($key, $enumClass, $default = null)
     {
         if ($this->isNotFilled($key) || ! $this->isBackedEnum($enumClass)) {
-            return null;
+            return value($default);
         }
 
-        return $enumClass::tryFrom($this->data($key));
+        return $enumClass::tryFrom($this->data($key)) ?: value($default);
     }
 
     /**

tests/Http/HttpRequestTest.php

@@ -804,6 +804,9 @@ public function testEnumMethod()
 
         $this->assertNull($request->enum('doesnt_exist', TestEnumBacked::class));
 
+        $this->assertEquals(TestEnumBacked::test, $request->enum('invalid_enum_value', TestEnumBacked::class, TestEnumBacked::test));
+        $this->assertEquals(TestEnumBacked::test, $request->enum('missing_key', TestEnumBacked::class, TestEnumBacked::test));
+
         $this->assertEquals(TestEnumBacked::test, $request->enum('valid_enum_value', TestEnumBacked::class));
 
         $this->assertNull($request->enum('invalid_enum_value', TestEnumBacked::class));