I am halfway through a migration from Kunena, I have (almost) successfully ran a test migration, but as I think about the permalinks problem, and also internal links problem, I wonder… Would it be hard to have Discourse create the new posts keeping the old post ids that Kunena originally assigned? …

The import script saves the import id in a post custom field. You can use it to create permalinks. Several importers do that. You can look at others for examples.

Thanks Jay, I know that, and I use that to go from old ids to new ids. But it would be more practical to simply use the same number and avoid that de-referencing. I am doing parts of my import with SQL and it complicates queries. Also, the permalinks table can get quite huge. A regexp redirect is …

It seems Discourse relies on PostgreSQL to assign the id, which is numeric: [image] And it seems PostgreSQL allows manipulation of that “sequence object”: [图片] 9.17. Sequence Manipulation Functions 9.17. Sequence Manipulation Functions # This section describes functions for operating…

[图片] pfaffman: You know about permalink normalizations? I had heard about these regexp operations but I was thinking they required post ids to match so a simple find-and-replace could take me from the old post id to the new one. Or is the mechanism more intelligent and it does a lookup on th…

Yes. You still need to have the post (or topic or category) ID in a permalink. Your solution might work with a plugin that you would have to continually maintain, but it’ll be really hard, and the recommended way works and has been used dozens of times, including several with millions of posts, and…

The approach (without keeping a plug in all the time) could be: Disable automatic serial numbers for topics Import everything with the old ids Re-enable serials, starting at a number larger than the MAX currently used But ok, I get the point - it’s easier with the permalinks feature. I have found…

Can anybody point to any Documentation on how to use the permalinks feature? Even if it’s minimal docs. I don’t mind helping to write a more extended documentation once I understand how this works. Thanks.

The best thing to do is to grep Permalink script/import-scripts/*rb and look at how people have used it.

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pfaffman (Jay Pfaffman) 2018 年10 月 18 日 11:53 4

The permalinks table is only as big as the post table. You know about permalink normalizations?

But to answer your question, yes, having discourse use different topic id would be very hard.

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