how to add custom fields to topic?

[deha]

topic only has fields like uid, cid, title, contend, tags, pined etc. I want to add a custom field to every topic like price: 50, subtitle: 'foo' to internal topic DB and then retrieve later for users. Any ideas? Thanks!

[yariplus]

Here you go!

https://community.nodebb.org/topic/9447/howto-inject-hidden-data-into-composer/8

This should get you started. You'll need to edit the composer.tpl, or inject html at composer load, checking if the post is a new topic.