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I've been looking for something similar and found a lot of approaches, spanning CRDTs, reactive databases, etc all of which look really promising. For me one of the missing pieces is situations where some parts of the object graph should not be visible or editable by certain users. That sort of thing comes up the whole time and can be pretty complex yet is often just handwaved away.

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> one of the missing pieces is situations where some parts of the object graph should not be visible or editable by certain users. That sort of thing comes up the whole time and can be pretty complex yet is often just handwaved away.

I discovered this problem in my domain about two months ago. My solution was to split my Aggregate Root into smaller pieces, to use DDD terminology. In my domain, each user/client owns their own data. However they may choose to publish that data and have it be publicly visible so others may view/comment/copy/pull-request it. It's basically Github for flashcards. So, I have an Aggregate Root for publicly visible flashcards, and another Aggregate Root for a user's personal flashcards. It helps that there are distinct behaviors for each Aggregate Root - there's no real point to leaving a comment on a personal flashcard, and there's no real point to "studying" a public flashcard (because that implies logging your study history to the public card). It does mean, however, that there needs to be a translation layer - it should be possible to convert a private flashcard to a publicly visible one, and it should also be possible to copy a public flashcard to your own personal collection.

Obviously this is very domain specific.

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