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Martin Sleziak
Martin Sleziak
20:38
Is there a way of linking to comments, which would be reliable even for a comment under an answer which is not necessarily on the first page of answers ... Yes, for example: https://stackoverflow.com/posts/comments/2221 ... I cheated to get that comment link — rene 25 mins ago
Let us try a MO post with many answers as a test. So this link https://mathoverflow.net/posts/comments/2259 indeed goes to a comment: mathoverflow.net/posts/comments/2259
And the comment is on the second page when the answers are sorted by score.
What happens if I post such a link in a chat message? Will it be oneboxed?
I would think of Completeness or Compactness of first order logic as a more reasonable answer. Incompleteness is interesting, but it feels more like a side branch of the theorem tree than the main trunk (whatever that means). — Richard Dore Oct 25 '09 at 6:40
Yes, it even gets oneboxed.
 
1 hour later…
Martin Sleziak
Martin Sleziak
21:51
Normally it doesn't matter what the title is because it only cares about and up to the postid in the url. I expect the problem here is that comment identifier is sent as fragment and that causes the problem when an redirect is done to land you on the now current url with the correct title. — rene 2 hours ago
Is there a way of linking to comments, which would be reliable even for a comment under an answer which is not necessarily on the first page of answers ... Yes, for example: https://stackoverflow.com/posts/comments/2221 ... I cheated to get that comment link — rene 2 hours ago
@rene, your comment suggests a mechanical translation from the auto-generated link https://stackoverflow.com/questions/56078/merging-two-collec‌​tiont/56108#comment2‌​221_56108 that simply strips out all information but the comment number—in particular, it suggests that the question number is not needed to refer to the post. Is that correct? — LSpice 44 mins ago
@LSpice yes, for that specific route you don't need the question number (post id technically). This is because the system has one comments table for all comments in the system. It has an id as well as an postid. So once you navigate to /posts/comments/{id} the server will lookup in the comments table the row with the matching id where it then also finds the postid. With that information it can build the correct url for you and send that back as Location header where your browser takes care of it. — rene 23 mins ago
Given that I'm used to questions having at least one comment, I was very surprised that the 2221st comment on SO should have been on the 56078th question! Are the numbers non-sequential? — LSpice 3 mins ago
Martin Sleziak
Martin Sleziak
22:31
On newer sites the identity column is a sequence. On the triology sites and a few other sites that I believe started on Version 1.0 of the Stack Exchange software have that non-sequential comment id. On SO the latest commentids are sequential data.stackexchange.com/stackoverflow/query/1352291 — rene 8 mins ago

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