如何添加一个非常基础的主题自定义字段

[merefield (Robert)]

Here’s another example, with a slightly different input scenario, but still leveraging the same mechanics and hooks:

https://github.com/paviliondev/discourse-topic-previews/blob/master/assets/javascripts/discourse/connectors/edit-topic/select-thumbnail-connector.hbs

https://github.com/paviliondev/discourse-topic-previews/blob/6064a5940a80e69ed56a7cbe67f8ded8e33e5d67/plugin.rb#L82