The Lounge What is on Your Mind? VBulletin 3.8 to Discourse on Docker Migration Test Take Four Post 303045312 by Neo on Monday 16th of March 2020 10:17:53 AM
Old 03-16-2020
I have a solution to this issue, or at least a workaround:

EDIT: This method only works on posts with no bbcode because discourse preprocesses the raw posts and changes the post. Hence, the MD4 (or matching methods in general, do not work).

Code:
raw = preprocess_post_raw()

On discourse (after migrating):

Code:
discourse=> select md5(raw) from posts where raw like '%where can i get a free copy of unix? any kind... plz send %';
               md5                
----------------------------------
 e136704539982b094d8d1d4229884583
(1 row)

On vb forums:

Code:
mysql> select md5(pagetext) from post where pagetext like '%where can i get a free copy of unix? any kind... plz send %';
+----------------------------------+
| md5(pagetext)                    |
+----------------------------------+
| e136704539982b094d8d1d4229884583 |
+----------------------------------+
1 row in set (1.07 sec)

So, the MD5() function in post mysql and postgres returns the same hash on the same post in two different DBs (it's should, but always good to check).

This means that we can match the posts in both DBs without unique post ids using MD5() and the user name who created the post.

The
Code:
MD5

hash combined with the user name should does not work because the post is preprocessed for bbcode and markdown.
 

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