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Fix many_many writes coverwriting equal values because of optimisation

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Kovid Goyal 2021-09-14 14:59:17 +05:30
parent 27dcbfd8c5
commit d45540686d
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1 changed files with 2 additions and 1 deletions
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src/calibre/db/write.py
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@ -439,7 +439,8 @@ def many_many(book_id_val_map, db, field, allow_case_change, *args):
# Ignore those items whose value is the same as the current value
g = table.book_col_map.get
book_id_item_id_map = {k:v for k, v in book_id_item_id_map.items() if v != g(k, missing)}
not_set = ()
book_id_item_id_map = {k:v for k, v in book_id_item_id_map.items() if v != g(k, not_set)}
dirtied |= set(book_id_item_id_map)
# Update the book->col and col->book maps