django：如何从 CharField 和 ModelChoiceField 中获取价值

Question

我有一个 GroupAdminForm 类，用于扩展 Django 中的组管理页面。有两个字段，selected_to_change 和 print_name。我打算做的是在 "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";

这里是 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 中获取值以在方法 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']