Migrate a Kunena 3 forum to Discourse

It might make sense to import them as likes. A few importers do that and can serve as examples.

If you have a budget and need help, please see my contact information is in my profile.

FYI based on this howto I wrote this one:

Hi Jay. I am working on the Import now, I have successfully done my first import with the Kunena3 script (with a Kunena4 database).

I got users, categories and posts converted, but now I want to fine-tune the process and get more information. Can you please point me to which conversion scripts you think are more complete (with the Likes or any other extras)? Thanks!

What I do is grep the import script directory for what I’m looking for.

I’ve not imported likes before. I’m unclear whether setting the like count in the post model is all that is required or whether that field gets updated some other way.

You can also look in app/models to see what’s there.

Thanks! My database has info about which user liked which post. I’ll have to see how that fits into Discourse (if possible), but it’s not just a count, it’s a list of user names related to individual posts.

You’ll need to look into the rails models to see how those are updated.

Probably this part of app/models/post_action.rb to update counts:

    when :like
      # 'like_score' is weighted higher for staff accounts
      score = PostAction.joins(:user)
        .where(post_id: post_id)
        .sum("CASE WHEN users.moderator OR users.admin THEN #{SiteSetting.staff_like_weight} ELSE 1 END")
      Post.where(id: post_id).update_all ["like_count = :count, like_score = :score", count: count, score: score]

and maybe I’ll try using this to actually do the “like” which is a kind of PostAction:

https://github.com/discourse/discourse/blob/master/script/import_scripts/lithium.rb#L380-L469

This is my first time even looking at Ruby code… this will be fun…

You can use the following method, if you don’t want to do everything with SQL like the Lithium importer does:

PostAction.act(user, post, PostActionType.types[:like])

Thanks. It might be just my Ruby/Discourse newbieness tricking me, but it seems the Lithium importer is doing more stuff, I wonder if it is necessary? It seems to add rows both in UserActions and PostActions. And it has some extra logic to add only “missing” actions, why is that?

And if I use the method you suggest, do I still need to update Like counts, or does it take care of that? Thanks!

Calling PostAction.act should take care of all necessary stuff. The same method gets called when you like a post in the UI.

I wrote a couple importers before I knew ruby. My Programming Languages professor told us in 1986 that if a job requirement was to know some language, we didn’t need to worry. He was right.

I recommend doing things the rails way rather than mucking with the database directly.

There are two different Kunena import scripts. One is kunena.rb, the other kunena3.rb. Kunena itself is up to version 6.x. Which script should be used for more recent versions of Kunena?

What I would do is to try kunena.rb first.

@JetForMe

I just posted my final scripts as a gist. I honestly don’t remember what I did there, or how specific that is to my community. But maybe you can diff those scripts to the originals and see a few problems I solved, and things I added. I tried to make the import more complete, I hate losing information in migrations.

→ importing-from-kunena-3-to-discourse · GitHub
and
→ importing-from-kunena-3-to-discourse-2 · GitHub

I hope this helps.

EDIT: I just remembered I used a mixture of Ruby scripts and SQL commands (I recommend DBWeaver for a practical SQL console during migrations). I can post SQL fragments if there is interest.

I was able to install mariadb-server and default-mysql-client (libmysqlclient-dev doesn’t exist anymore).
But now I have the following error:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/run/mysqld/mysqld.sock' (2)

So how can I start the mysql instance? mysql.server start doesn’t work