通过Django中的模型表单保存多对多数据

Z时代
2024-01-10
分类：问答

我在从表单保存许多字段时遇到问题。这是我的模型：

class TextIssue(models.Model):
    Issue = models.CharField(max_length=150, unique=True)
    def __unicode__(self):
        return self.Issue
class PadIssue(models.Model):
    Issue = models.CharField(max_length=150, unique=True)
    def __unicode__(self):
        return self.Issue   
class PHIssue(models.Model):
    Data = models.ForeignKey(Data)
    TextIssue = models.ManyToManyField(TextIssue, blank=True, null=True)
    PadIssue = models.ManyToManyField(PadIssue, blank=True, null=True)
    Notes = models.TextField()
    def clean(self):
        from django.core.exceptions import ValidationError
        if self.TextIssue is None and self.PadIssue is None:
            raise ValidationError('You must choose at least one issue category.')   
        if self.Notes is None:
            raise ValidationError('You must write a note regarding the issues selected above.')
class PHIssueForm(ModelForm):
    class Meta:
        model = PHIssue
        exclude = ('Data',)

在这里，我在views.py中处理发布请求：

def process_npiform(request, npi_id=None):
    if npi_id:
        try:
            npi = Data.objects.get(id=int(npi_id))
        except: 
            raise Http404   
    if request.method == 'POST':
        data = DataForm(request.POST, instance=npi, prefix='npi_data')
        if data.is_valid():
            update = data.save(commit=False)
            if not request.user.is_superuser:
                update.User = request.user
            update.save()
            if update.Status == 'past-due':
                try:
                    prefab = PHIssue.objects.get(Data=npi)
                except:
                    prefab = PHIssue(Data=Data.objects.get(id=int(update.id)))
                    prefab.save()
                issue = PHIssueForm(request.POST, instance=prefab, prefix='npi_issue')
                if issue.is_valid():
                    save_issue = issue.save(commit=False)
                    save_issue.save()
            return HttpResponseRedirect(reverse('pm'))
        else:
            return render_to_response('npi/data.html', {'data': data, 'issue': issue}, context_instance=RequestContext(request))    
    else:
        return HttpResponseRedirect(reverse('pm'))