修改

app/Http/Controllers/AdminApi/ApplyController.php

@@ -18,7 +18,7 @@ class ApplyController extends AdminController
         if ($name) $where[] = ['u.name', 'like', "%$name%"];
 
         $list = WxSignup::from('wx_signups as s')
-            ->leftJoin('wx_users as u', 's.m_id', '=', 'u.id')
+            ->leftJoin('wx_users as u', 's.p_id', '=', 'u.id')
             ->where($where)
             ->where(function ($q) use ($search){
                 if($search){

app/Http/Controllers/Api/UserController.php

@@ -212,7 +212,11 @@ class UserController extends FrontController
             return $this->apiResponseError( '该号码已提交');
         }
 
+        //获取用户上级
+        $p_id = WxUser::where('id',$m_id)->value('p_id');
+
         $res = WxSignup::create([
+            'p_id' => $p_id,
             'm_id' => $m_id,
             'name' => $name,
             'phone' => $phone,