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The Lounge What is on Your Mind? Update on vB3 Migration to Discourse - Issues and Status of BBCode Transformations Post 303045598 by Neo on Friday 3rd of April 2020 12:05:05 AM
Old 04-03-2020
Also, I am finding, by trial and error, that even before preprocessing with the Ruby migration scripts, there are some transformations which are easily done on the copy of the vB3 MySQL DB dump; for example:

Code:
UPDATE post SET  pagetext= LOWER(REGEXP_REPLACE(pagetext,'\\[ATTACH\\](.*)\\[\\/ATTACH\\]', '[IMG]https://www.unix.com/attachment.php?attachmentid=\\1[/IMG]'));

There was some bug in the Ruby attachment preprocessing and some attachment ids were lost, so instead of wasting time trying to find the bug in the Ruby preprocessing routine, it was easier to do the regex search and replace in the staged copy of the DB dump.

All these attachment images are automatically downloaded to the new discourse forum over time as well.

Note: Not being an expert in MariaDB REGEX_REPLACE, started with (.*) and worked my way up, and the matches only worked with the double backslashes (escapes) , would not match with single backslashes. None of the examples on the net worked (most showed no backslashes or one backslash only) in this REGEX_REPLACE expression; but I could get it to work, building it from .* up, step-by-step.

Update: This change is done and confirmed working on the staging server.
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MojoMojo::Controller::Attachment(3pm)			User Contributed Perl Documentation		     MojoMojo::Controller::Attachment(3pm)

NAME
MojoMojo::Controller::Attachment - Attachment controller DESCRIPTION
MojoMojo supports attaching files to nodes. This controller handles administration and serving of these assets. ACTIONS
auth Return whether the current user has attachment manipulation rights (upload/delete). unauthorized Private action to return a 403 with an explanatory template. default Private action to return a 404 not found page. attachments Main attachment screen. Handles uploading of new attachments. list Display the list of attachments if the user has view permissions. template: attachments/list.tt plain_upload Upload feature that uses the traditional upload technique. check_file Check if the file(s) uploaded could be added to the Attachment table. flash_upload Upload feature that uses flash attachment Find and stash an attachment. defaultaction Set the default action for an attachment which is forwarding to a view. view Render the attachment in the browser ("Content-Disposition: inline"), with caching for 1 day. download Forwards to "view" then forces the attachment to be downloaded ("Content-Disposition: attachment") and disables caching. thumb Thumb action for attachments. Makes 100x100px thumbnails. inline Show 800x600 inline versions of photo attachments. delete Delete the attachment from this node. Will leave the original file on the file system but delete its thumbnail and inline versions. AUTHOR
Marcus Ramberg "marcus@nordaaker.com" LICENSE
This library is free software. You can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2010-05-23 MojoMojo::Controller::Attachment(3pm)
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