Live testing of remote categories
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@julian The way cross-posting works on Lemmy and Reddit is basically to copy the post, so there's not necessarily a reason to break the one-to-one mapping of posts-to-categories. (Though, actually, looking at Reddit, I think it's actually a new post with an internal link preview, rather than a wholesale copy of content as it is on Lemmy). But more advanced frameworks could be interesting
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@julian can you be specific in how to track it?
Although Ive found it I cant seem to follow / track that community.
What do I do? Apologies if Im being stupid, but Ive tried@eeeee no problem, what seems straightforward for me isn't always the case for others!
Below the category description, there is a bar that contains buttons for sorting the topic list. The first of those buttons controls whether you are watching or tracking the category. It usually corresponds to whether you see topics from that category in your unread and recent pages.
For remote categories, this controls whether or not you are following the category. If you are following the category, then topics posted in that category will show up in your unread page.
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@julian example using foaf and sioc...
```
id = f1
type = [as:Service, sioc:Forum]
as:summary = "Forum TF category"id = g1
type = [as:Group, foaf:Group, foaf:Agent, sioc:User]
as:name = "AP Forum Task Force"
foaf:member = [Julian, a]id = t1
type = [as:Collection, sioc:Thread]
as:summary = "Some thread"
sioc:has_container = f1id = p1
type = [as:Event, sioc:Post]
as:name = "Meeting on April 2025"
sioc:has_container = t1
sioc:has_creator = g1
as:attributedTo = g1
```@[email protected] in general, if NodeBB discovers a group, it will create an (initially) empty category in order to house topics.
If in the course of that category's life, no topics actually make it in (i.e. if nobody addresses anything to it, nobody follows it, etc.) then it'll be pruned out as normal.
So if an as:Group contains users, and doesn't share or send creates, then it'll just be a little stub that goes nowhere, that's all.
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I would be remiss if I didn't also mention that while this theoretically works with software like PieFed and Mbin, it has only really been tested against NodeBB (of course) and Lemmy.
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Some interesting bugs atm
All the ActivityPub groups I was following prior to this update were successfully migrated to become remote categories (good!), but now that they are no longer treated as remote users, this has left behind a bunch of "guest" users in my
/followingpage.
Also due to the migration, a bunch of topics that used to be categorised under @activitypub, were automatically moved to [[@activitypub](https://community.nodebb.org/category/30/activitypub)@forum.wedistribute.org](https://community.nodebb.org/category/[email protected])!
I presume this happened because [[@activitypub](https://community.nodebb.org/category/30/activitypub)@forum.wedistribute.org](https://community.nodebb.org/category/[email protected]) is set to mirror @activitypub. I'm guessing that since the group actor was sharing all these posts, once NodeBB recognised it as a remote category instead, it began to treating those share activities as move actions.
Seeing how NodeBB does not have a notion of topics belonging to multiple categories, you might want to revisit how you handle remote categories that follow and mirror local categories.
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Some interesting bugs atm
All the ActivityPub groups I was following prior to this update were successfully migrated to become remote categories (good!), but now that they are no longer treated as remote users, this has left behind a bunch of "guest" users in my
/followingpage.
Also due to the migration, a bunch of topics that used to be categorised under @activitypub, were automatically moved to [[@activitypub](https://community.nodebb.org/category/30/activitypub)@forum.wedistribute.org](https://community.nodebb.org/category/[email protected])!
I presume this happened because [[@activitypub](https://community.nodebb.org/category/30/activitypub)@forum.wedistribute.org](https://community.nodebb.org/category/[email protected]) is set to mirror @activitypub. I'm guessing that since the group actor was sharing all these posts, once NodeBB recognised it as a remote category instead, it began to treating those share activities as move actions.
Seeing how NodeBB does not have a notion of topics belonging to multiple categories, you might want to revisit how you handle remote categories that follow and mirror local categories.
@AltCode thanks for reporting! I'll take a look at those tomorrow.
The topics being moved out is a byproduct of the migration. Looks like some tweaking is in order! Perhaps I'll only move topics whose main post is on the same domain.
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@AltCode I've moved those topics back to the proper category
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Edit: updated as had to click into category to follow
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I can confirm it works with Mbin, look at my instance: https://kbin.melroy.org/m/[email protected]/p/286459/Happy-Tuesday-Today-we-ve-updated-the-NodeBB-community-forum-onto#post-comment-413326
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@julian @activitypub Makes sense. Were NodeBB's own federated categories represented as users prior to this change? Do you assume that all groups are FEP-1b12 groups?
There was an interesting discussion on SocialHub on identifying FEP-1b12 groups and nutomic made a compelling argument that we should just assume thatGroupsupports FEP-1b12 if there is no other indicator:https://socialhub.activitypub.rocks/t/fep-1b12-group-federation/2724/96
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@julian @activitypub Makes sense. Were NodeBB's own federated categories represented as users prior to this change? Do you assume that all groups are FEP-1b12 groups?
There was an interesting discussion on SocialHub on identifying FEP-1b12 groups and nutomic made a compelling argument that we should just assume thatGroupsupports FEP-1b12 if there is no other indicator:https://socialhub.activitypub.rocks/t/fep-1b12-group-federation/2724/96
@[email protected] good questions!
Local NodeBB categories are still federated out as ActivityPub actors, with
as:typeGroup, they follow 1b12 as they always have.I do assume that group actors adhere to 1b12, but that doesn't stop others from creating topics by mentioning them directly. If a NodeBB instance happens to hear about that, we'll add it to the remote category.
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@AltCode the two bugs you identified have been resolved, can you confirm the latter? The former I manually moved them back already to the right category.
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Confirmed working with:
- PieFed Communities: PieFed Meta
- Flipboard Magazines: [Gear by @[email protected]](https://community.nodebb.org/category/[email protected])
However, while Flipboard magazines send Announces as per 1b12, and the items are added to the outbox, the objects themselves do not address the magazine at all, and so a backreference is missing. When they come into NodeBB, there's no pointer back to the group, and so it is slotted into the "uncategorized" bucket.
tl;dr — can this object
https://flipboard.com/users/Engadget/statuses/uva9misBSrqjCSR6mtzV6g:a:3199686please includehttps://flipboard.com/@engadget/gear-nv6v86arzin itstoorccproperty? -
@julian Yes, I can confirm that the other bug has been fixed! There's no more guest accounts in my
/followingpage. -
@julian not sure. Cc’ing @jaonculverhouse
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@julian @activitypub Makes sense. Were NodeBB's own federated categories represented as users prior to this change? Do you assume that all groups are FEP-1b12 groups?
There was an interesting discussion on SocialHub on identifying FEP-1b12 groups and nutomic made a compelling argument that we should just assume thatGroupsupports FEP-1b12 if there is no other indicator:https://socialhub.activitypub.rocks/t/fep-1b12-group-federation/2724/96
@[email protected] I read back a bit to get a fuller context (not all the way, though, there's a damn lot of bikeshedding in that topic.)
Basically Nutomic is advocating against multi typing because it is poorly supported (true), and because Lemmy has first-mover advantage (also true.)
Requiring a multitype or boolean flag for 1b12 would be quite difficult to do because you'll never have 100% adoption and end up needing backwards compatibility with 1b12-classic anyway — cat's already out of the bag.
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@julian How do you deal with situations where the group actor also sends posts?
For example, on Hubzilla, (streams), and Forte, the top level post of a forum thread is from the forum, not the user. This was originally done for Mastodon compatibility since it did not understand threaded conversations and groups. They could follow the forum as if it were a user, and receive all of the forum posts. They could send a DM to the forum to create a new post.
NodeBB took a different approach, using boosts to distribute user posts to people who follow the forum. And I think you said you use mentions within a post to create a new top level post.
How are we handling the differences in approaches? -
@julian How do you deal with situations where the group actor also sends posts?
For example, on Hubzilla, (streams), and Forte, the top level post of a forum thread is from the forum, not the user. This was originally done for Mastodon compatibility since it did not understand threaded conversations and groups. They could follow the forum as if it were a user, and receive all of the forum posts. They could send a DM to the forum to create a new post.
NodeBB took a different approach, using boosts to distribute user posts to people who follow the forum. And I think you said you use mentions within a post to create a new top level post.
How are we handling the differences in approaches?wrote on last edited by [email protected]@[email protected] can you share an example of a group actor from Hubzilla? Would be interesting to see how that's handled. Likely it wouldn't work properly because categories in NodeBB don't author posts.
Do your group actors send creates on behalf of regular users? That might work ok.
Lastly, there's no requirement that a NodeBB category be mentioned. It only needs to be addressed. A mention is the easiest way to do that because you addressing is abstracted out of the Mastodon UI.
But for things like PieFed, Lemmy, Mbin, and likely Hubzilla, you're able to change addressing based on where you create the post.
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@julian I'm not sure. They changed things in the last major version when they adopted FEP 171b Conversation Containers.
Some examples of forum channels are @Hubzilla Support Forum and @Neuhub Support Forum. -
@julian
But for things like PieFed, Lemmy, Mbin, and likely Hubzilla, you're able to change addressing based on where you create the post.
Yes, in Hubzilla, we can click on the padlock and select who the post is addressed to, including NodeBB forums. I haven't tried it yet, but Hubzilla does recognize NodeBB categories as "forums."
