I needed to sort a set of objects (a QuerySet for example) by an externally provided list of IDs - for example:
>>> writers = Writer.objects.all()
>>> sort_by_id_sequence(writers, [3, 1, 2])
[<Writer id: 3>, <Writer id: 1>, <Writer id: 2>]
1 2 3 4 5 6 7 8 9 10 | def sort_by_id_sequence(objects, id_sequence):
max_score = len(objects)
def sort_score_for_object(obj):
# A lower score is better
id = obj.id
try:
return id_sequence.index(id)
except ValueError: # Not found
return max_score
return sorted(objects, key=sort_score_for_object)
|
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