You could add :deleted_at field inside included_do, so it's added everywhere you include the concern. Actually not sure if it's possible with ActiveRecord, but with Mongoid for sure.
Great job! These are really interesting, and elegent. They are kind of software engineering problems. Makes you think! Can you do more like this? :-)
Absolutely! I like trying to show how to use a gem as well as showing how you could build your own version from scratch. It makes using any library a lot less daunting when you know you could go in and fix it yourself if you wanted. :)
Got any suggestions you'd like to see?
I'm building my own soft deletable module, but I would like to set the current_user.id in a deleted_by column, to know which user deleted it. It is bad practice to set the user as a global variable available to the model layer due to thread safety...see thread_mattr_accessor and thread_cattr_accessor and a nice article by BigBinary. I will simply implement a destroy(user_id=0) method. If the user_id is passed through from the controller, it will be saved...otherwise the deleter will be 0 and therefore unknown.
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