forms.py 文件源码

def __init__(self, *args, **kwargs):
        super(PageBlockQueryForm, self).__init__(*args, **kwargs)
        block_choices = BLANK_CHOICE_DASH + [
            (b, b) for b in
            PageBlock.objects.values_list('block', flat=True).distinct()
        ]
        self.fields['block'].choices = block_choices