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FIX: Narrative Bot certificates are ERB templates (#8174)
There are at least two ways of rendering templates outside of the controller. The first one is Rails way enabled with Rails 5 https://evilmartians.com/chronicles/new-feature-in-rails-5-render-views-outside-of-actions The downside of this method is that all variables need to be passed as params (I could find a way to pass the whole context) Another way is to use instance_eval described in Erubi documentation https://github.com/jeremyevans/erubi#usage - it works perfectly fine, however, I didn't feel very confident about using eval unless necessary. An additional benefit of using `ApplicationController.render` is that if Rails would change the ERB engine in the future, this code should still work. If you want to test it on your local, you need to be signed in and then that two URLs are generating certificates: http://localhost:3000/discobot/certificate.svg?date=Oct+07+2019&type=standard&user_id=1 http://localhost:3000/discobot/certificate.svg?date=Oct+07+2019&type=advanced&user_id=1 Dev: https://dev.discourse.org/t/discourse-narrative-bot-should-not-be-storing-giant-strings/17130
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