Help with managing multiple "creators" in epub metadata

[Gaqs]

Hello everyone, I'm having a problem managing epub metadata, basically I have this series of translated books where it's supposed to have an author, but no matter how I changed or polished the book, when I sent the book to koreader it would display a different author instead(with et al. at the end signifying other authors) .

I decided to look into it and if I extract the epub file and look at the "content.opf" file inside, I think I see the problem

    <dc:creator id="creator02">translator</dc:creator>
    <dc:creator id="creator03">translator</dc:creator>
    <dc:creator id="creator04">translator</dc:creator>
    <dc:creator id="id-1">author</dc:creator>
    <dc:rights>Copyright © 2013 author</dc:rights>

I changed their actual names here to author and translator, but basically what's displayed in koreader are the translator names instead of the author, and I can't see the extra "creator" names at all in calibre, the only name that shows up is the actual author name, so I can't change or remove these extra people from the interface, since they don't show up at all.

Using the polish book tool doesn't work either, it just stays the same with these extra people there.

Now, I'm not technical at all, I need to know, is there any easy way to just remove these "creators" directly from the calibre interface? so that the author is displayed correctly in koreader? Or will I need to do something more complicated like editing the files one by one using the edit book tool to get it how I want? I'm honestly not good with this so I don't want to "break" my books.

EDIT: I saw another of my books with multiple authors and I think the normal behavior should be for calibre to show all the "creator" tags as authors separated with &'s, so I think the problem here is that calibre just isn't detecting all the "creator" tags here, thus not allowing me to delete the other "creators"

[kovidgoyal]

this will be a bug in koreader report it there, you can work around it by deleting those entries from the opf manually using the edit book tool.

[Gaqs]

Originally Posted by kovidgoyal

this will be a bug in koreader report it there, you can work around it by deleting those entries from the opf manually using the edit book tool.

I ended up deleting them using the edit book tool like you said, thanks.

But are you sure this is a bug in koreader and not in calibre? I feel like calibre should be detecting these entries and displaying them on the interface but it isn't, while koreader is displaying them.

I looked through other books that have multiple authors and they have the same structure in the opf file, and calibre detects them correctly.

[kovidgoyal]

Yes, I'm sure. They will not have their roles set.

[Gaqs]

Originally Posted by kovidgoyal

Yes, I'm sure. They will not have their roles set.

I see, thanks for the help.

[wordloversf]

This is a frequent problem with Calibre - where can we edit, via the main interface, multiple authors? An example: recent edition of "Siddhartha" by Herman Hesse, translated by Joachim Neugroschel. There is no location in any Calibre screen to edit "translator" so when the file is viewed in a Kobo OR Freda epub reader, the *author* is incorrectly listed (and indexed) as "Neugroschel." Where/how can we view or add "editor" and "introduction by" and "translator" fields to the main Calibre "edit metadata" screen to be able to edit problems like this?

https://www.dropbox.com/s/e2uaw8o6yt...ha_01.jpg?dl=0

https://www.dropbox.com/s/co9haqutdw...ha_02.jpg?dl=0

https://www.dropbox.com/s/mxukz65p2q...ha_03.jpg?dl=0

[kovidgoyal]

So, report the bug to freda and kobo. I am not adding extra UI to calibre to workaround bugs in other software in dealing with a particular format. calibre will change only authors marked with the role author or editor in EPUB files. If other software incorrectly decides to display translators as authors, that's a bug in that software.