/Python/Use in in django while preserving order

Use in in django while preserving order

pk_list = [5, 7, 1, 3, 4]
clauses = ' '.join(['WHEN id=%s THEN %s' % (pk, i) for i, pk in enumerate(pk_list)])
ordering = 'CASE %s END' % clauses
queryset = Article.objects.filter(pk__in=pk_list).extra(
           select={'ordering': ordering}, order_by=('ordering',))

Source: codybonney.com

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