调整关联模型的save方法返回值

library/think/model/relation/MorphMany.php

@@ -215,7 +215,7 @@ class MorphMany extends Relation
      * 保存（新增）当前关联数据对象
      * @access public
      * @param mixed $data 数据 可以使用数组 关联模型对象 和 关联对象的主键
-     * @return integer
+     * @return Model|false
      */
     public function save($data)
     {
@@ -225,10 +225,10 @@ class MorphMany extends Relation
         // 保存关联表数据
         $pk = $this->parent->getPk();
 
+        $model                  = new $this->model;
         $data[$this->morphKey]  = $this->parent->$pk;
         $data[$this->morphType] = $this->type;
-        $model                  = new $this->model;
-        return $model->save($data);
+        return $model->save($data) ? $model : false;
     }
 
     /**