django:如何从CharField和ModelChoiceField获取值

Question

我有一个类GroupAdminForm,用于扩展Django中的组管理页面.有两个字段,selected_to_change和print_name.我正在设计的是在"selected_to_change"中选择一列并在"print_name"中输入一个字符名称,以便进行如下查询:

UPDATE "annotation" 
SET print_name= "value of print_name" 
WHERE id = "value of selected_to_change";

这是GroupAdminForm:

class GroupAdminForm(forms.ModelForm):
    users = forms.ModelMultipleChoiceField(queryset=User.objects.all(),
                                       widget=FilteredSelectMultiple('Users', False),
                                       required=False)

    select_to_change = forms.ModelChoiceField(queryset=Annotation.objects.all(), required=False)
    print_name = forms.CharField(required=False)

    class Meta:
        model = Group

    def __init__(self, *args, **kwargs):
        instance = kwargs.get('instance', None)
        if instance is not None:
            initial = kwargs.get('initial', {})
            initial['users'] = instance.user_set.all()
            initial['locations'] = instance.c_locations.all()
            kwargs['initial'] = initial
        super(GroupAdminForm, self).__init__(*args, **kwargs)

    def save(self, commit=True):
        group = super(GroupAdminForm, self).save(commit=commit)

        if commit:
            group.user_set = self.cleaned_data['users']
        else:
            old_save_m2m = self.save_m2m
            def new_save_m2m():
                old_save_m2m()
                group.user_set = self.cleaned_data['users']
            self.save_m2m = new_save_m2m
        return group

如何从CharField和ModelChoiceField获取值以在方法save()中进行此类查询？谢谢.

Answer 1

您已经在使用 self.cleaned_data 中保存的表单中的数据。

print self.cleaned_data['select_to_change']
print self.cleaned_data['print_name']