### Author:  [@Dev\_Work](https://meta.discourse.org/u/Dev_Work)
#### Post date: [2020年二月6日 10:20 UTC](https://meta.discourse.org/t/how-do-i-use-my-validator-in-the-plugin/140839/2 "2020-02-06T10:20:37Z")
> [@Dev\_Work](#):
>
> ```plaintext
>
> ```
那里将 key 设为 ‘validator’
甚至这样的示例也能生效：
```plaintext
plugins:
my_custom_username_validation:
default: 'system'
validator: 'UsernameSettingValidator'
```
> [@Developing Discourse Plugins - Part 3 - Add custom site settings](https://meta.discourse.org/t/beginners-guide-to-creating-discourse-plugins-part-3-custom-settings/31115/23):
>
> I was looking how to create a site setting that validates a username, but found there’s a username type to do this. Here the list of site setting types we have today: email username integer regex string list enum Also, you can do custom validations for your plugin settings, it accepts a validator field that expects a Ruby class. You use it like this. plugins: my\_custom\_username\_validation: default: 'system' validator: 'UsernameSettingValidator' You can check the [UsernameSettingVal…](https://github.com/discourse/discourse/blob/master/lib/validators/username_setting_validator.rb)
>
---
### Author:  [@Dev\_Work](https://meta.discourse.org/u/Dev_Work)
#### Post date: [2020年二月8日 14:35 UTC](https://meta.discourse.org/t/how-do-i-use-my-validator-in-the-plugin/140839/3 "2020-02-08T14:35:45Z")
将文件放置在 `discourse/lib/validators/ldap_setting_validator.rb` 后，问题已解决：
```plaintext
forum_ldap_validation:
default: 'system'
validator: 'LdapSettingValidator'
```
如何使该代码在插件中生效？
---
### Author:  [@Dev\_Work](https://meta.discourse.org/u/Dev_Work)
#### Post date: [2020年二月8日 15:27 UTC](https://meta.discourse.org/t/how-do-i-use-my-validator-in-the-plugin/140839/4 "2020-02-08T15:27:29Z")
太好了，成功了
plugin.rb 中的代码
```plaintext
def forum_require(path)
require Rails.root.join('plugins', 'forum', 'app', path).to_s
end
after_initialize do
forum_require 'lib/ldap_setting_validator'
//代码
end
```
ldap\_setting\_validator.rb → 路径 → myplugin/app/lib/ldap\_setting\_validator.rb
感谢提供的示例 → [babble/plugin.rb at master · gdpelican/babble · GitHub](https://github.com/gdpelican/babble/blob/master/plugin.rb#L17-L52)
---
### Author:  [@simon](https://meta.discourse.org/u/simon)
#### Post date: [2020年六月5日 20:41 UTC](https://meta.discourse.org/t/how-do-i-use-my-validator-in-the-plugin/140839/5 "2020-06-05T20:41:53Z")
> [@Dev\_Work](#):
>
> 我如何在插件中使用我的验证器？
我昨天一直在寻找如何操作的示例。我在 Discourse 仓库中找到的示例位于此处：[https://github.com/discourse/discourse-chat-integration。你会看到，在该插件的](https://github.com/discourse/discourse-chat-integration%E3%80%82%E4%BD%A0%E4%BC%9A%E7%9C%8B%E5%88%B0%EF%BC%8C%E5%9C%A8%E8%AF%A5%E6%8F%92%E4%BB%B6%E7%9A%84) `plugin.rb` 文件中，验证器类是通过以下命令引入的：
```plaintext
require_relative "lib/discourse_chat/provider/slack/slack_enabled_setting_validator"
```
为了让 Discourse 找到该验证器，它需要在调用 `after_initialize` 之前被包含进来。