[5.7] Backport #26486 - Fix FormRequest validation triggering twice

src/Illuminate/Foundation/Http/FormRequest.php

@@ -58,6 +58,13 @@ class FormRequest extends Request implements ValidatesWhenResolved
      */
     protected $errorBag = 'default';
 
+    /**
+     * The validator instance.
+     *
+     * @var \Illuminate\Contracts\Validation\Validator
+     */
+    protected $validator;
+
     /**
      * Get the validator instance for the request.
      *
@@ -77,7 +84,9 @@ protected function getValidatorInstance()
             $this->withValidator($validator);
         }
 
-        return $validator;
+        $this->setValidator($validator);
+
+        return $this->validator;
     }
 
     /**
@@ -172,7 +181,7 @@ protected function failedAuthorization()
      */
     public function validated()
     {
-        return $this->getValidatorInstance()->validated();
+        return $this->validator->validated();
     }
 
     /**
@@ -195,6 +204,19 @@ public function attributes()
         return [];
     }
 
+    /**
+     * Set the Validator instance.
+     *
+     * @param  \Illuminate\Contracts\Validation\Validator  $validator
+     * @return $this
+     */
+    public function setValidator(Validator $validator)
+    {
+        $this->validator = $validator;
+
+        return $this;
+    }
+
     /**
      * Set the Redirector instance.
      *

tests/Foundation/FoundationFormRequestTest.php

@@ -10,6 +10,7 @@
 use Illuminate\Routing\UrlGenerator;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Contracts\Validation\Validator;
 use Illuminate\Contracts\Translation\Translator;
 use Illuminate\Validation\Factory as ValidationFactory;
 use Illuminate\Contracts\Validation\Factory as ValidationFactoryContract;
@@ -67,6 +68,15 @@ public function test_validated_method_returns_the_validated_data_nested_array_ru
         $this->assertEquals(['nested' => [['bar' => 'baz'], ['bar' => 'baz2']]], $request->validated());
     }
 
+    public function test_validated_method_not_validate_twice()
+    {
+        $payload = ['name' => 'specified', 'with' => 'extras'];
+        $request = $this->createRequest($payload, FoundationTestFormRequestTwiceStub::class);
+        $request->validateResolved();
+        $request->validated();
+        $this->assertEquals(1, FoundationTestFormRequestTwiceStub::$count);
+    }
+
     /**
      * @expectedException \Illuminate\Validation\ValidationException
      */
@@ -246,13 +256,36 @@ public function authorize()
     }
 }
 
+class FoundationTestFormRequestTwiceStub extends FormRequest
+{
+    public static $count = 0;
+
+    public function rules()
+    {
+        return ['name' => 'required'];
+    }
+
+    public function withValidator(Validator $validator)
+    {
+        $validator->after(function ($validator) {
+            self::$count++;
+        });
+    }
+
+    public function authorize()
+    {
+        return true;
+    }
+}
+
 class FoundationTestFormRequestForbiddenStub extends FormRequest
 {
     public function authorize()
     {
         return false;
     }
 }
+
 class FoundationTestFormRequestHooks extends FormRequest
 {
     public function rules()