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py3: Fix sorting on one-one fields that can have None values

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Fixes #1878388 [Private bug](https://bugs.launchpad.net/calibre/+bug/1878388)
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Kovid Goyal 2020-05-13 16:59:33 +05:30
parent e40834080e
commit 9c05bb0ff3
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1 changed files with 7 additions and 0 deletions
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7
src/calibre/db/fields.py
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@ -192,6 +192,13 @@ def sort_keys_for_books(self, get_metadata, lang_map):
dk = self._default_sort_key
sk = self._sort_key
if sk is IDENTITY:
if dk is not None:
def none_safe_key(book_id):
ans = bcmg(book_id, dk)
if ans is None:
ans = dk
return ans
return none_safe_key
return lambda book_id:bcmg(book_id, dk)
return lambda book_id:sk(bcmg(book_id, dk))