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Hat-trick for getting categories related to an object group

Author:
pablo_PXL
Posted:
January 30, 2011
Language:
Python
Version:
1.2
Score:
0 (after 0 ratings)

Three step list comprehension for getting a set of categories existing in a group of objects 

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## helpers.py
def get_categories(category_model, item_set):
    return [category for category in
            category_model.objects.all() if category in
            [item.category for item in item_set]]

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