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When merging metadata objects, if a custom column has type multiple in the new data and some other type in the old data, ignore the old data instead of erroring out. Fixes #1881796 [Private bug](https://bugs.launchpad.net/calibre/+bug/1881796)
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@ -15,7 +15,7 @@ from calibre.ebooks.metadata.book import (SC_COPYABLE_FIELDS,
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TOP_LEVEL_IDENTIFIERS, ALL_METADATA_FIELDS)
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from calibre.library.field_metadata import FieldMetadata
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from calibre.utils.icu import sort_key
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from polyglot.builtins import iteritems, unicode_type, filter, map
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from polyglot.builtins import iteritems, unicode_type, filter, map, string_or_bytes
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# Special sets used to optimize the performance of getting and setting
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# attributes on Metadata objects
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@ -544,6 +544,8 @@ class Metadata(object):
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meta = other.get_user_metadata(x, make_copy=True)
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if meta is not None:
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self_tags = self.get(x, [])
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if isinstance(self_tags, string_or_bytes):
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self_tags = []
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self.set_user_metadata(x, meta) # get... did the deepcopy
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other_tags = other.get(x, [])
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if meta['datatype'] == 'text' and meta['is_multiple']:
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