django下ChoiceField等, queryset 动态设定

定义:class XXXForm(forms.Form):    def __init__(self, query_set=None, *args, **kwargs):        super(XXXForm, self).__init__(*args, **kwargs)        roles = forms.ModelMultipleChoiceField(label=u"角色:",                                           required=False,                                           widget=CheckboxSelectMultiple,                                           queryset=query_set)        self.fields['roles'] = roles            password = forms.CharField(label="修改密码:",                               widget=forms.PasswordInput,                               min_length=6,                               max_length=32,                               required=False,                               error_messages={"required"   : u"请输入密码",                                                "min_length" : "密码长度为6-32个字符",                                                "max_length" : "密码长度为6-32个字符"})使用:role_form = forms.XXXForm(query_set=query_set, initial=initial_dict)