[13.x] Check traits in resolveClassAttribute

src/Illuminate/Database/Eloquent/Model.php

@@ -2673,6 +2673,16 @@ protected static function resolveClassAttribute(string $attributeClass, ?string
 
                     return static::$classAttributes[$cacheKey] = $property ? $instance->{$property} : $instance;
                 }
+
+                foreach ($reflection->getTraits() as $trait) {
+                    $attributes = $trait->getAttributes($attributeClass);
+
+                    if (count($attributes) > 0) {
+                        $instance = $attributes[0]->newInstance();
+
+                        return static::$classAttributes[$cacheKey] = $property ? $instance->{$property} : $instance;
+                    }
+                }
             } while ($reflection = $reflection->getParentClass());
         } catch (Exception) {
             //

tests/Database/DatabaseEloquentModelAttributesTest.php

@@ -447,6 +447,20 @@ public function test_trait_initializer_merges_fillable_with_attribute(): void
 
         $this->assertEqualsCanonicalizing(['name', 'email', 'phone'], $model->getFillable());
     }
+
+    public function test_trait_with_attribute_applies_to_class(): void
+    {
+        $model = new ModelUsingWithoutIncrementingTraitWithAttribute;
+
+        $this->assertFalse($model->getIncrementing());
+    }
+
+    public function test_class_attribute_takes_precedence_over_trait(): void
+    {
+        $model = new ModelOverridingTraitConnectionAttribute;
+
+        $this->assertSame('primary', $model->getConnectionName());
+    }
 }
 
 enum ConnectionUnitEnum
@@ -773,3 +787,24 @@ class ModelWithFillableAttributeAndTrait extends Model
 {
     use AddsPhoneFillable;
 }
+
+#[WithoutIncrementing]
+trait TraitUsingWithoutIncrementingAttribute
+{
+}
+
+class ModelUsingWithoutIncrementingTraitWithAttribute extends Model
+{
+    use TraitUsingWithoutIncrementingAttribute;
+}
+
+#[Connection('secondary')]
+trait TraitUsingConnectionAttribute
+{
+}
+
+#[Connection('primary')]
+class ModelOverridingTraitConnectionAttribute extends Model
+{
+    use TraitUsingConnectionAttribute;
+}