bulk_operations.py 文件源码

def update_list_best_practice():
    """
    Hits the DB once no matter how many objects.
    NB:
      - save() will not be called, and the related signals will not be sent.
      - does not work with m2m relationships.

    >>> UPDATE community SET name = (community.name + ' e.V')
        WHERE community.name LIKE 'community%'
    """
    communities = Community.objects.filter(name__startswith='community')
    communities.update(name=Concat('name', Value(' e.V')))


## Bulk delete
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