wiki.trwnh.com/content/tech/spec/activitypub/confusion/disambiguating-activity-by-shape-not-id.md

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2024-01-11 17:42:59 +00:00
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## what this affects
whenever you embed a Follow, Block, Like, or some other activity where the original id isn't easily on hand, you can embed it as the `object` without an id. in such a case, the shape of the activity becomes semantically significant.
for example, say you want to remove a follower. you typically do this with Reject Follow. but what do you do if you never stored the original Follow id? you embed it like so
```yaml
id: <some-activity>
actor: <you>
type: Reject
object:
- type: Follow # this has no id
object: <someone>
```
now ideally you probably *should* be storing the ids for everything... but eh, what can ya do.
<https://github.com/w3c/activitypub/issues/384>