django - 验证 Django 中的唯一字段

Question

我不知道我是否以正确的方式解决问题。预期的结果是有一个只显示 name 的表单。和 description .用户提交表单后，我想将当前用户添加为 owner并检查是否已经有一个条目具有相同的 name和 user .如果有，我想返回有错误的表单。如果没有，我想保存 Status .

我的型号:

class Status(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField(blank=True)
    owner = models.ForeignKey(User)
    active = models.BooleanField(default=True)

    class Meta:
        unique_together = ('name','owner')

我的看法:

def settings_status(request):
    status_form = StatusForm()

    if request.method == 'POST':
        status_form = StatusForm(request.POST)
            if status_form.is_valid():
                new_status = Status()
                new_status.name = status_form.cleaned_data['name']
                new_status.description = status_form.cleaned_data['description']
                new_status.owner = request.user
                new_status.save()

    return render_to_response('base/settings_status.html',{
        'status_form'           :       status_form,
}, context_instance=RequestContext(request))

我尝试了很多东西，但我一直遇到问题，如果我添加 owner单独添加到对象，则模型的 clean 无法使用它函数，因此不能用于检查是否 name和 owner是独一无二的。

Answer 1

有几种方法可以做到这一点:

例如，将用户(所有者)传递给表单:

表格.py:

class StatusForm(forms.Form):
    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user','')
        super(StatusForm, self).__init__(*args, **kwargs)
        self.fields['name'] = forms.CharField(label='Name')
        self.fields['description'] = CharField(label='Description', widget=forms.Textarea)

    def clean(self):
        cleaned_data = self.cleaned_data
        name = cleaned_data.get('name')

        if Status.objects.filter(name=name, owner=self.user).exists():
            self._errors['name'] self.error_class(['Status with this name exists'])  

        return cleaned_data

View .py:

def settings_status(request):

    if request.method == 'POST':
        status_form = StatusForm(request.POST, user=request.user)
            if status_form.is_valid():
                new_status = Status()
                new_status.name = status_form.cleaned_data['name']
                new_status.description = status_form.cleaned_data['description']
                new_status.owner = request.user
                new_status.save()
    else:
        status_form = StatusForm(user=request.user)

    context = {'status_form':status_form,}

    return render_to_response('base/settings_status.html', context,
                context_instance=RequestContext(request))

另请查看根据您的表单设置设置初始数据并考虑使用 ModelForm。