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How to make taxonomy term names unique per user?

I have a taxonomy vocabulary, Groups.

Requirements

  • Different users can create groups with the same name. (User A can make an apples group, and User B can also make an apples group.)
  • The same user cannot make two groups with the same name (User A cannot make two apples groups.)

How can I implement this?

D8/9 offers a field constraint as explained in this answer and this blog post, but this makes a field unique for all users.

I want to make the taxonomy term name unique per user. Also, this needs to work with JSON:API. How can I do this?

This article was republished from its original source.
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How to make taxonomy term names unique per user?

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