Odd that it’s working without having to do that.
Because you switched to a different method
Category.find_by(slug: "site-feedback")
Does not equal
Category.find_by_slug("site-feedback")
Note how in the file there is no method defined find_by, there is find_by_slug and find_by_email.
That is because find_by is built into ActiveRecord, and you are querying the category table for any record containing slug = 'whatever value you asked for', which is inherently different than using the method that exists in the category.rb file.
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I have installed your plugin, but it doesn’t seem to work… 
I’ve followed instruction here Install Plugins in Discourse
After installation Discourse works fine, but it seems nothing changed: if I look at users’ profiles of the group I wanted to force to watch a category, nothing changed, the category doesn’t appear among the watched ones.
This is my fork, maybe I did some mistakes…?
https://github.com/don-durito/discourse-watch-category-mcneel/blob/master/plugin.rb
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The job runs once a day, if you look in sidekiq (http://discoursever/sidekiq) under scheduler, you can manually trigger a task. If you want the script to run more frequently, just update the frequency in the script.
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