Question

我正在尝试创建一个验证规则，如果（里程碑）对象target_date大于项目target_date，则传递错误。问题是没有出现任何错误。

为了简单起见，

models.py

class Project(models.Model):
    target_date = models.DateField()

class Milestone(models.Model):
    project = models.ForeignKey(Project)
    target_date = models.DateField()

Forms.py

class MilestoneAddForm(forms.ModelForm):

    class Meta:
        model = Milestone

    def clean_target_date(self):
        tdate = self.cleaned_data['target_date']
        if tdate > self.instance.project.target_date
            raise forms.ValidationError("Target Date is outside or project target date.")
        return tdate

views.py（删除不相关的代码）

def MilestoneManage(request, project_id):
    qs = Project.objects.none()
    if request.method == 'POST':
        formset = MilestoneFormSet(request.POST, prefix='new')
        if formset.is_valid():
            newMiles = formset.save(commit=False)
            for new in newMiles:
                new.project_id = project.id
                new.save()
            return HttpResponseRedirect(reverse('project.views.detail', args=(project.id,)))
    else:
        formset = MilestoneFormSet2(queryset=qs, prefix='new')
    return render_to_response('project/manageMilestones.html', {
        'formset': formset,
    }, context_instance=RequestContext(request))

Answer 1

这应该有效。有关更改内容的详细信息，请参阅内联注释。

def clean_target_date(self):
    #                 V-- typo (cleand_data => cleaned_data)
    tdate = self.cleaned_data['target_date']
    project = self.instance.project
    # project allows for nulls, so check that first.
    if project is None:
        raise forms.ValidationError("There's no project associated with this milestone.")
    #                   V-- Do an attribute lookup, don't use the query lookup syntax
    if tdate > project.target_date:
        raise forms.ValidationError("Target Date is outside or project target date.")
    return tdate

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