F 修复可能会出现同名账户的问题

spug_api/apps/account/views.py

@@ -30,6 +30,8 @@ class UserView(View):
             Argument('role_id', type=int, help='请选择角色'),
         ).parse(request.body)
         if error is None:
+            if User.objects.filter(username=form.username, deleted_by_id__isnull=True).exists():
+                return json_response(error=f'已存在登录名为【{form.username}】的用户')
             form.password_hash = User.make_password(form.pop('password'))
             form.created_by = request.user
             User.objects.create(**form)