[kaddressbook] [Bug 320022] New: kaddressbook silently loses vCard entries when UID is not unique

[Thomas Bleher]

https://bugs.kde.org/show_bug.cgi?id=320022

            Bug ID: 320022
           Summary: kaddressbook silently loses vCard entries when UID is
                    not unique
    Classification: Unclassified
           Product: kaddressbook
           Version: 4.10
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: bleher at informatik.uni-muenchen.de
                CC: tokoe at kde.org

I recently tried to load a vCard file where several addresses had an identical
UID. KAddressBook seemed to load the file just fine, but several entries were
missing. It turned out that the missing entries had a duplicated UID with
another field.

I know that this is an error in the file, but it would be very helpful if
KAddressBook noticed this error, and printed an appropriate message.

Background: I regularly export my data from KAddressBook via a small script:
https://github.com/tbleher/vcard-tools/blob/master/akonadi-to-vcard
I recently tried to re-import the generated vCard file on another computer, and
noticed the error there. Apparently, duplicate UIDs are stored in the Akonadi
database itself (as far as I could see, when an entry is copied). Now I don't
know if this is a bug (because I don't know the internal akonadi format), and
certainly the way the script accesses the data is not officially supported, but
I thought the issue would still be worth mentioning.

I often export my data

Reproducible: Always

Steps to Reproduce:
1. Load vCard file which contain several entries, where some entries contain
duplicate UID

Actual Results:  
Some addresses are missing

Expected Results:  
All addresses are there, or a warning is generated

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