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- Never embed personalized information (eg not `{ post: { user_has_commented: true } }`

Until you hear from an iOS developer that it is a huge pain trying to figure out if the user has left a comment on an item or not and including this little flag would save tons of time.

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client lib code is never the issue. usually scaling or breaking contracts is

you can just add it as separate key (similar how you embed eg user objects)

``` posts: {…} interactions: { commented_on_posts: [1212,12,1212,121] } ```

btw most people over estimate this problem the _total_ amount of user interactions is usually very small

in almost all cases you could download it once at boot for the user.

Good ideas, thanks!

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