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  1. MusicBrainz Server
  2. MBS-8524

Merging entities can corrupt tags up/down-votes



    • Type: Bug
    • Status: Closed
    • Priority: High
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2015-08-24
    • Component/s: Edit system
    • Labels:


      I have found recently countless examples of entities (recordings/releases/release groups) with tags up-voted by myself that I'm pretty sure I've never voted for. This always appears on entities for which I'had done some up-votes, but not on the tags currently marked.

      First of all I didn't reported it and thought I must have clicked on some +/- up vote tags by mistake.
      But this is becoming more and more frequent and it cannot be the case anymore.

      The latest example is http://musicbrainz.org/release-group/2fbf4c3e-09e5-38f0-ae59-fbdc9ea16b87/tags. I'm pretty sure that I may have up-voted "hard rock" and maybe "classic rock" or "rock" if any, but nothing else. But now when I look at the release group it says that I up-voted "pop/rock" and "should be public domain" and nothing else. Two tags I never up-vote for! I may well have down-voted them however...

      On all the other latest examples that I have analyzed, I was able to identify a single event that always preceded the appearance of these misplaced up-votes on tags: All these entities were recently merged. For the example above the release group was merged a few days ago in http://musicbrainz.org/edit/34427730.

      I noted also until now, that the misplaced tags are always up-votes, never down-votes.
      One possible explanation that I Could find is that down votes can beconverted in up-votes in a merge. I will try to track that down in other examples.

      This may be a serious bug I every merge has the possibility to destroy the tags up-vote count
      Please look at what is going in the merge code for tags up-votes; it is slowly destroying all the tags I've been adding
      Thanks a lot.




            • Assignee:
              bitmap Michael Wiencek
              ebz777 ebz777
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