Quote:
Originally Posted by chaley
"Custom book data" isn't custom columns. It is a persustent map of keys to values, intended for plugins to store extra book information pertinent to that plugin. For example, a plugin might want to store some extra dates about a book that the plugin will need later. It can use add_custom_book_data() to store this information.
If you want to update custom columns then use db.new_api.set_field().
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Yes, thank you. I've seen it later. I'm using that function in one of my plugins (obviously wrong and I was mislead). After using set_field it's working.