diff --git a/src/model/concern/Attribute.php b/src/model/concern/Attribute.php
index a6ca470e..6265ae80 100644
--- a/src/model/concern/Attribute.php
+++ b/src/model/concern/Attribute.php
@@ -18,8 +18,6 @@
 use Stringable;
 use think\db\Raw;
 use think\helper\Str;
-use think\Model;
-use think\model\Collection as ModelCollection;
 use think\model\Relation;
 
 /**
@@ -411,10 +409,6 @@ public function setAttr(string $name, $value, array $data = []): void
         // 检测修改器
         $method = 'set' . Str::studly($name) . 'Attr';
 
-        if ($value instanceof Model || $value instanceof ModelCollection) {
-            $this->with[$name]  = true;
-        }
-
         if (method_exists($this, $method)) {
             $array = $this->data;
             $value = $this->$method($value, array_merge($this->data, $data));
@@ -428,6 +422,7 @@ public function setAttr(string $name, $value, array $data = []): void
         } elseif ($this->isRelationAttr($name)) {
             // 关联属性
             $this->relation[$name]  = $value;
+            $this->with[$name]      = true;
         } elseif ((array_key_exists($name, $this->origin) || empty($this->origin)) && $value instanceof Stringable) {
             // 对象类型
             $value = $value->__toString();
diff --git a/src/model/concern/Conversion.php b/src/model/concern/Conversion.php
index a26d8e52..c972769e 100644
--- a/src/model/concern/Conversion.php
+++ b/src/model/concern/Conversion.php
@@ -264,7 +264,7 @@ public function toArray(): array
                     $val->hidden($hidden[$key], true);
                 }
                 // 关联模型对象
-                if (array_key_exists($key, $this->with) && (!isset($hidden[$key]) || true !== $hidden[$key])) {
+                if (!array_key_exists($key, $this->relation) || (array_key_exists($key, $this->with) && (!isset($hidden[$key]) || true !== $hidden[$key]))) {
                     $item[$key] = $val->toArray();
                 }
             } elseif (isset($visible[$key])) {