Integrate with `attr_json` gem to provide a better API for working with settings/category_settings about notifications-rails HOT 3 OPEN

Really like these ideas. I just think that using a tree with a method enabled? like I proposed in #38 would be even nicer as it allows for two separate ways to read and write to/from the data. And it would have room for some logic that would make it possible to use different data types.

Sidenote on compatibility:
I don't think that we should be worried too much with changing the API as long as we improve it 😉

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But as I said, I think we should think separately about storing/retrieving the data (using jsonb, json or whatever) and structuring it to make it easy to fetch (when testing if a notification should be created/sent) and update (when using a form)

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I like your thoughts about compatibility, and about considering data storage separately from the other concerns...

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