Question

所以我通过模型为表单添加了一个额外的字段，＆amp;使用这些选择：

A_CHOICES = (
    ('none', 'none'),
    # further conversion table

class MyForm(ModelForm):

extra_field_a = ChoiceField(choices=A_CHOICES)

如果此字段不是'none'，那么我想将其值用于模型中的字段，但我不确定如何检索它，我在MyForm内尝试了：

def cleaned_extra(self):
    if(self.cleaned_data.get('extra_field_a') != 'none'):
        return self.extra_field_a
    else:
        return self.original_field

但我得到一个NameError，'未定义全局名称'？任何帮助非常感谢，

亚当

Answer 1

这就是你如何检索它。除了时髦的语法，NameError在哪里？ self未定义？你把这个代码放在哪里。

您通常会将此类字段特定代码放在clean_FOO方法中。 http://docs.djangoproject.com/en/dev/ref/forms/validation/#form-and-field-validation

def clean_extra_field_a(self):
    data = self.cleaned_data.get('extra_field_a')
    if data != 'none':
        return data
    return None # remember to set this field as required=False

def save(self, *args, **kwargs):
    # override save to do something with your extra field.
    self.instance.myfield = self.cleaned_data.get('extra_field_a')
    super(MyForm).save(*args, **kwargs)

更新：在视图中保存没问题。

mymodel = myform.save(commit=False) 
# ModelForm's will return the object being created/edited on save()
# commit=False will prevent a database save

mymodel.myfield = myform.cleaned_data.get('extra_field_a')
mymodel.save()

# note if you have an m2m, there is an extra method to call on commit=False

模型表单额外字段

1 个答案: