From 1b70bef5fd7cc5da74abcdf79e283f830fa3b0a4 Mon Sep 17 00:00:00 2001
From: Taylor Otwell <taylorotwell@gmail.com>
Date: Wed, 5 Aug 2020 14:38:51 -0500
Subject: [PATCH] fix casing issue with guarded

---
 .../Database/Eloquent/Concerns/GuardsAttributes.php      | 2 +-
 tests/Integration/Database/EloquentModelTest.php         | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Illuminate/Database/Eloquent/Concerns/GuardsAttributes.php b/src/Illuminate/Database/Eloquent/Concerns/GuardsAttributes.php
index b9095c0480c7..04ea61db37f4 100644
--- a/src/Illuminate/Database/Eloquent/Concerns/GuardsAttributes.php
+++ b/src/Illuminate/Database/Eloquent/Concerns/GuardsAttributes.php
@@ -163,7 +163,7 @@ public function isFillable($key)
      */
     public function isGuarded($key)
     {
-        return in_array($key, $this->getGuarded()) || $this->getGuarded() == ['*'];
+        return $this->getGuarded() == ['*'] || ! empty(preg_grep('/^'.preg_quote($key).'$/i', $this->getGuarded()));
     }
 
     /**
diff --git a/tests/Integration/Database/EloquentModelTest.php b/tests/Integration/Database/EloquentModelTest.php
index 751e280b9ddf..7564835d3fa9 100644
--- a/tests/Integration/Database/EloquentModelTest.php
+++ b/tests/Integration/Database/EloquentModelTest.php
@@ -29,6 +29,15 @@ protected function setUp(): void
         });
     }
 
+    public function testCantUpdateGuardedAttributesUsingDifferentCasing()
+    {
+        $model = new TestModel2;
+
+        $model->fill(['ID' => 123]);
+
+        $this->assertNull($model->ID);
+    }
+
     public function testUserCanUpdateNullableDate()
     {
         $user = TestModel1::create([