@julian I tested out a root post that mentioned a PieFed community, and it got there okay - it's viewable at https://pythag.net/c/sci_fi (and federated out okay to another PieFed instance at https://palaver.p3x.de/c/sci_fi@pythag.net)

My guess as to why Lemmy might not like it is that the activity contains:

"audience": "https://community.nodebb.org/category/-1"

It looks like Lemmy tries to fetch that and can't parse the response.

@freamon oh! You're right on the money.

For whatever reason, Lemmy always checks audience even though it doesn't need to.

I brought this up for discussion in their github, and it resulted in @nutomic@lemmy.ml removing parsing of audience altogether!

So this might actually be a moot point once more Lemmy instances update, but I am not 100% sure.

@silverpill@mitra.social this is now tested and outgoing backfill is working with NodeBB.

Are there plans to introduce post collections to all levels via context?

While there is utility in exposing it for the root-level, if I am Announce'd one of the replies (e.g. this one), there is no explicit link to the top-level post in order to discover context.

@julian Sure, I will add context to replies. Maybe in the next release

@angus @mario @jupiter_rowland @kopper

@mario@hub.somaton.com when you say "internally backfills", I'm assuming you mean between Hubzilla instances?

Is this done via context containing activities, or objects?

I still cant post into a community on Lemmy. Ive had more tries and looked at other posts which are going in. It seems they are directed in there somehow, not just by mentioning the group in the post.
@julian did you get any idea on this?

@eeeee it is likely due to audience.

So, what happens on your end is you make a topic and mention the Lemmy community.

When NodeBB federates that post out, the Lemmy community is included in the mentions, but it also specifies your category 18, World Chat, in audience.

If Lemmy sees that, and it doesn't know about that community already, it will drop the activity immediately. If it does, then it will likely slot the post into the "World Chat on isurg.com" community on that Lemmy instance.

Lemmy removed audience checking, so this might be a non-issue. Once that Lemmy instance updates to the latest version, it'll hopefully post to the correct community.

That's a tricky one, though, because which community should it post to?

• "Medicine" on mander.xyz, or
• "World Chat" on isurg.com?

Ok but I also referenced @isurg@lemm.ee and that didnt get a notification either

I get your dilema about should it post in world or in medicine@mander.xyz
So if I want it to go in mander@xyz how to specify that?

@eeeee You wait for me to overhaul the entire /world/category UX so that you can "browse" to @medicine@mander.xyz from your NodeBB itself.

That sounds good