Override setAttributeMarkedMutatedAttributeValue method;

Author: hans-thomas

src/Eloquent/Model.php

@@ -251,6 +251,37 @@ public function attributesToArray()
         return $attributes;
     }
 
+    /** @inheritdoc */
+    protected function setAttributeMarkedMutatedAttributeValue($key, $value)
+    {
+        $attribute = $this->{Str::camel($key)}();
+
+        $callback = $attribute->set ?: function ($value) use ($key) {
+            $this->attributes[$key] = $value;
+        };
+
+        $normalizeCastClassResponse = $this->normalizeCastClassResponse(
+            $key, $callback($value, $this->attributes)
+        );
+
+        if (count($normalizeCastClassResponse) > 1) {
+            $normalizeCastClassResponse = [$key => $normalizeCastClassResponse];
+        }
+
+        $this->attributes = array_merge(
+            $this->attributes,
+            $normalizeCastClassResponse
+        );
+
+        if ($attribute->withCaching || (is_object($value) && $attribute->withObjectCaching)) {
+            $this->attributeCastCache[$key] = $value;
+        } else {
+            unset($this->attributeCastCache[$key]);
+        }
+
+        return $this;
+    }
+
     /** @inheritdoc */
     public function getCasts()
     {