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When getting identifiers for a book use a copy of the dict

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Fixes #1945098 [5.28 Forgets or reverts identifiers](https://bugs.launchpad.net/calibre/+bug/1945098)
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Kovid Goyal 2021-09-26 20:07:49 +05:30
parent 32e9dc32b2
commit 5bf68b5971
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1 changed files with 4 additions and 2 deletions
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6
src/calibre/db/fields.py
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@ -577,8 +577,10 @@ class ManyToManyField(Field):
class IdentifiersField(ManyToManyField): class IdentifiersField(ManyToManyField):
def for_book(self, book_id, default_value=None): def for_book(self, book_id, default_value=None):
ids = self.table.book_col_map.get(book_id, ()) ids = self.table.book_col_map.get(book_id, None)
if not ids: if ids:
ids = ids.copy()
else:
try: try:
ids = default_value.copy() # in case default_value is a mutable dict ids = default_value.copy() # in case default_value is a mutable dict
except AttributeError: except AttributeError: