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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.
This User Gave Thanks to Neo For This Post:
 

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RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME
rake -- Ruby Make SYNOPSIS
rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE] [-r MODULE] [--rules] [variable=value] target ... DESCRIPTION
Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command. Rake has the following features: o Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax. No XML files to edit. No quirky Makefile syntax to worry about (is that a tab or a space?). o Users can specify tasks with prerequisites. o Rake supports rule patterns to synthesize implicit tasks. o Flexible FileLists that act like arrays but know about manipulating file names and paths. o A library of prepackaged tasks to make building rakefiles easier. OPTIONS
--version Display the program version. -C --classic-namespace Put Task and FileTask in the top level namespace -D [PATTERN] --describe [PATTERN] Describe the tasks (matching optional PATTERN), then exit. -E CODE --execute-continue CODE Execute some Ruby code, then continue with normal task processing. -G --no-system --nosystem Use standard project Rakefile search paths, ignore system wide rakefiles. -I LIBDIR --libdir LIBDIR Include LIBDIR in the search path for required modules. -N --no-search --nosearch Do not search parent directories for the Rakefile. -P --prereqs Display the tasks and dependencies, then exit. -R RAKELIBDIR --rakelib RAKELIBDIR --rakelibdir RAKELIBDIR Auto-import any .rake files in RAKELIBDIR. (default is rakelib ) -T [PATTERN] --tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit. -e CODE --execute CODE Execute some Ruby code and exit. -f FILE --rakefile FILE Use FILE as the rakefile. -h --help Prints a summary of options. -g --system Using system wide (global) rakefiles (usually ~/.rake/*.rake ). -n --dry-run Do a dry run without executing actions. -p CODE --execute-print CODE Execute some Ruby code, print the result, then exit. -q --quiet Do not log messages to standard output. -r MODULE --require MODULE Require MODULE before executing rakefile. -s --silent Like --quiet, but also suppresses the 'in directory' announcement. -t --trace Turn on invoke/execute tracing, enable full backtrace. -v --verbose Log message to standard output (default). --rules Trace the rules resolution. SEE ALSO
ruby(1) make(1) http://rake.rubyforge.org/ REPORTING BUGS
Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>. You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>. Or you can send an email to the author. AUTHOR
Rake is written by Jim Weirich <jim@weirichhouse.org> UNIX
November 7, 2012 UNIX
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