get() returned more than one Tag -- it returned 2!

Hello Sometimes when adding tags to an existing object, I am getting the following error.

get() returned more than one Tag -- it returned 2!

Here is the code I am using

...
publication.tags.set(all_tags, clear=True)
publication.save()
# I also tried
publication.tags.set(all_tags)
publication.save()
# and
publication.tags.add(*all_tags)
publication.save()
# but still getting the same issue
...

Notes:

• I am not using any get function
• Django version 4.1

[rtpg]

@naskio thank you very much for that detail! It sounds very important.

If in your system you have that problem, the easiest thing to do would be to normalize manually in a database migration. So for example you find all of the TaggedItems that are pointing to UKRAINE and then point them to Ukraine. From there, you should be able to delete UKRAINE.

You’ll need to do some database cleanup. I think though that this error should have its own handling, though. And it might even make sense for us to write a helper management command… but at the very least we should document what to do.

[naskio]

@rtpg For me the ideal solution would be to have both options: 1- Handling this case by taking only the first tag when get() returns more than one, This would be more flexible enabling us to disable TAGGIT_CASE_INSENSITIVE again without impacting the data. 2- A management command if someone decides to enable TAGGIT_CASE_INSENSITIVE and keep only one instance of similar tags.