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multisort: Sort only once on any given field

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This commit is contained in:
Kovid Goyal 2013-08-29 12:33:25 +05:30
parent c16d95877e
commit c10d73e5c6
1 changed files with 5 additions and 2 deletions
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7
src/calibre/db/cache.py
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@ -7,7 +7,7 @@ __license__ = 'GPL v3'
__copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'
import os, traceback, random, shutil, re
import os, traceback, random, shutil, re, operator
from io import BytesIO
from collections import defaultdict
from functools import wraps
@ -23,7 +23,7 @@ from calibre.db.errors import NoSuchFormat
from calibre.db.fields import create_field, IDENTITY
from calibre.db.search import Search
from calibre.db.tables import VirtualTable
from calibre.db.write import get_series_values
from calibre.db.write import get_series_values, uniq
from calibre.db.lazy import FormatMetadata, FormatsList, ProxyMetadata
from calibre.ebooks import check_ebook_format
from calibre.ebooks.metadata import string_to_authors, author_to_author_sort, get_title_sort_pat
@ -830,6 +830,9 @@ class Cache(object):
return skf
return func
# Sort only once on any given field
fields = uniq(fields, operator.itemgetter(0))
if len(fields) == 1:
return sorted(ids_to_sort, key=sort_key_func(fields[0][0]),
reverse=not fields[0][1])