调试

app/views/users/_user.json.jbuilder

@@ -3,5 +3,5 @@ json.login user.login
 json.name user.full_name
 json.grade user.grade
 # json.email user.mail # 邮箱原则上不暴露的，如果实在需要的话只能对某些具体的接口公开
-json.image_url image_url(url_to_avatar(user))
+json.image_url url_to_avatar(user)
 json.school user.school_name

app/views/users/get_user_info.json.jbuilder

@@ -1,7 +1,9 @@
 json.username @user.full_name
 json.login @user.login
 json.user_id @user.id
-json.image_url url_to_avatar(@user)
+json.image_url image_url(url_to_avatar(@user))
+json.image_path image_path(url_to_avatar(@user))
+json.image_tag image_tag(url_to_avatar(@user))
 json.admin @user.admin?
 json.is_teacher @user.user_extension&.teacher?
 json.tidding_count 0