this post was submitted on 19 Jun 2023
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API call GetComments sometimes returns no comments (lemmy.world)
submitted 2 years ago* (last edited 2 years ago) by [email protected] to c/[email protected]
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This happens for me on a small number of posts, and is generally repeatable, even when the website shows comments.

For instance, running on lemmy.world, GetPost(id: 290602) tells me the post exists and has 7 comments, as does https://lemmy.world/post/290602

But GetComments(postId: 290602) returns an empty list.

If I run against the original post on 'programming.dev', GetComments(postId: 99912) does show me the comments, but I don't think I'm supposed to be second guessing the federating logic :-)

Has anyone seen anything similar or can confirm they see this same behaviour for this post?

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[–] [email protected] 2 points 2 years ago* (last edited 2 years ago) (1 children)

Quick update for anyone reading this:

I've just worked out how to use curl with the Lemmy API, and sadly curl -H 'Accept: application/activity+json' "https://lemmy.world/api/v3/comment/list?limit=10&postId=290602" does show the comments, so I had to accept that there's something wrong in my request.

Having fiddled about a bit it appears that setting the type parameter controls whether non-local comments get included, so adding type: CommentListingType.all solved this problem.

[–] [email protected] 1 points 2 years ago* (last edited 2 years ago)

Hi! The first curl example doesn't seem to work - it fetches comments but they are not relevant to https://lemmy.world/post/290602 :

> curl -H 'Accept: application/activity+json' "https://lemmy.world/api/v3/comment/list?limit=10&postId=290602" | jq -c '.comments[] | [.post.id, .comment.id, community.name]'
[484044,486431,"nostupidquestions"]
[455772,486976,"giftofgaming"]
...
[485477,486428,"outoftheloop"]
[484044,485717,"nostupidquestions"]

It seems that we need to set type_ parameter like this:

> curl -H 'Accept: application/activity+json' "https://lemmy.world/api/v3/comment/list?limit=10&post_id=290602&type_=All" | jq -c '.comments[] | [.post.id, .comment.id, community.
name]'
[290602,484328,"programmer_humor"]
[290602,374758,"programmer_humor"]
...
[290602,355277,"programmer_humor"]
[290602,345799,"programmer_humor"]
[–] [email protected] 2 points 2 years ago

Yes! I didn't see your post, I'm having the same issue, specifically with the instances lemmy.world and feddit.de. Good to know it's not my fault I guess?

[–] [email protected] 2 points 2 years ago (1 children)

I was running into this. I’ve noticed that some instances seem to have limits to how many comments you can fetch at a time, especially when there is no “limit” or “page” set. Setting “limit” or “page” or a parent id seems to avoid it. The limits for each server might be under getSite(), but if those limits are related to this issue specifically, haven’t tested it

[–] [email protected] 1 points 2 years ago

Thanks, that’s an interesting gotcha to watch out for.

[–] [email protected] 1 points 2 years ago

I was running into this. I’ve noticed that some instances seem to have limits to how many comments you can fetch at a time, especially when there is no “limit” or “page” set. Setting “limit” or “page” or a parent id seems to avoid it. The limits for each server might be under getSite(), but if those limits are related to this issue specifically, haven’t tested it

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