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 mykl@lemmy.world to c/lemmydev@lemm.ee
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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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[โ€“] mykl@lemmy.world 1 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.

[โ€“] nmtake@lemm.ee 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"]