如何根据FK字段验证Django Form字段 [英] How to validate a Django Form field against a FK field

问题描述

我试图创建一个验证规则，如果（里程碑）对象target_date大于项目target_date，则传递错误。问题是没有提出任何错误。

为简单起见，

models.py

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

Forms.py

 类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，如果request.method =='POST'：
 formset = MilestoneFormSet（request.POST，prefix ='new'）
 if formset.is_valid（）：
 newMiles = formset.save（commit = False）
 for 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（requ est））
  

解决方案

这应该起作用。

  def clean_target_date（self）：
＃V-- typo （cleand_data => cleared_data）
 tdate = self.cleaned_data ['target_date'] 
 project = self.instance.project 
＃项目允许空值，所以先检查一下。 
如果项目为None：
 raise forms.ValidationError（没有与此里程碑关联的项目）
＃V--执行属性查找，不要使用查询查找语法
 if tdate> project.target_date：
 raise forms.ValidationError（Target Date is outside or project target date。）
 return tdate 
  

I am attempting to create a validation rule that passes an error if the (milestone)objects target_date is greater then the projects target_date. The issue is that none of the errors are being raised.

For simplicities sake,

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(dropped unrelated code)

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))

解决方案

This should work. See inline comments for more info on what was changed.

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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