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Add a comment explaining the use of a bytestring for default sort key

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Kovid Goyal 2013-07-22 12:59:07 +05:30
parent dcedc5b87d
commit d336d75a81
1 changed files with 6 additions and 0 deletions
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6
src/calibre/db/fields.py
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@ -31,7 +31,13 @@ class Field(object):
self.has_text_data = dt in {'text', 'comments', 'series', 'enumeration'} self.has_text_data = dt in {'text', 'comments', 'series', 'enumeration'}
self.table_type = self.table.table_type self.table_type = self.table.table_type
self._sort_key = (sort_key if dt in ('text', 'series', 'enumeration') else lambda x: x) self._sort_key = (sort_key if dt in ('text', 'series', 'enumeration') else lambda x: x)
# This will be compared to the output of sort_key() which is a
# bytestring, therefore it is safer to have it be a bytestring.
# Coercing an empty bytestring to unicode will never fail, but the
# output of sort_key cannot be coerced to unicode
self._default_sort_key = b'' self._default_sort_key = b''
if dt in {'int', 'float', 'rating'}: if dt in {'int', 'float', 'rating'}:
self._default_sort_key = 0 self._default_sort_key = 0
elif dt == 'bool': elif dt == 'bool':