django：如何從CharField和ModelChoiceField獲得價值

Question

我有一個GroupAdminForm類，用於擴展Django中的組管理頁面。 有兩個字段，selected_to_change和print_name。 我要設計的是在“ selected_to_change”中選擇一列，並在“ print_name”中輸入字符名稱，以便進行如下查詢：

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

這是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

如何從CharField和ModelChoiceField中獲取值以在方法save（）中進行此類查詢？ 謝謝。

Answer 1

您已經在self.cleaned_data中使用保存的表單中的數據。

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