[Koha-bugs] [Bug 13760] Authorities merge sometimes create duplicate fields in biblio

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13760

--- Comment #6 from Jacek Ablewicz <abl at biblos.pk.edu.pl> ---
(In reply to Fridolin SOMERS from comment #0)

> Actually some cases create a duplicate field.
> For example, a biblio record as : 
>   600 $9 11 $a Son Goku
>   600 $9 12 $a Vegeta

> If you merge the authorities id=11 and id=12 into id=11 (creating Gogeta),
> you actually get :
>   600 $9 11 $a Son Goku
>   600 $9 11 $a Son Goku

This patch seems to work fine for relativelly simple cases. But what about some
more complex ones, like e.g:

   700 $9 11 $a Son Goku $t Aaa Bbb
   700 $9 12 $a Vegeta $t Ddd Ccc
   700 $9 12 $a Vegeta $t Eee Fff

after merge, result will be:

   700 $9 11 $a Son Goku $t Aaa Bbb

instead of

   700 $9 11 $a Son Goku $t Aaa Bbb
   700 $9 11 $a Son Goku $t Ddd Ccc
   700 $9 11 $a Son Goku $t Eee Fff

> Having two identical fields linked to the same authority is useless.

I agree, but there is no check anywhere to ensure that the suspected
"duplicates" are in fact identical? While having 2+ $9 links to the same
authority record from one biblio record is probably not very common (depending
on the material type, local cataloguing rules etc.), AFAIK this can happen
occasionally and in such cases it's not always necessarily an error and/or a
duplicate.

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