Django formset隐藏外键

Question

This 问答让我成功了 90%。所以感谢社区。​​p>

我有一个模型表单集，它验证并进入“如果有效”循环

models.py

class session_log(models.Model):
    anaesthetist_id = models.ForeignKey('auth.User')
    session_start_datetime = models.DateTimeField(blank=False)
    session_end_datetime = models.DateTimeField(blank=False)
    session_type= models.ForeignKey(session_types, null=True, blank=True)
    session_comments=models.TextField(null=True, blank=True)

    def __unicode__(self):
        return str(self.anaesthetist_id)+" "+str(self.session_start_datetime.date())+" "+str(self.session_type)

forms.py

class SessionList(forms.ModelForm):

    session_comments = forms.CharField(required=False, widget=forms.Textarea(attrs={'rows':1}))
    session_start_datetime = forms.DateTimeField(input_formats=['%d/%m/%y %H:%M',], widget=forms.DateTimeInput(format="%d/%m/%y %H:%M"))    
    session_end_datetime = forms.DateTimeField(input_formats=['%d/%m/%y %H:%M',], widget=forms.DateTimeInput(format="%d/%m/%y %H:%M"))    

    class Meta:
        model = session_log
        exclude = ('anaesthetist_id',)
        fields = ['session_start_datetime', 'session_end_datetime', 'session_comments','session_type']

views.py

def session_overview(request):


    SessionListFormSet = modelformset_factory(session_log, form=SessionList, extra = 10, exclude =('anaesthetist_id',), can_delete=True)
    x = session_log.objects.filter(anaesthetist_id=request.user.id).count()
    y = x-10
    initialformset = SessionListFormSet(queryset=session_log.objects.filter(anaesthetist_id=request.user.id).order_by("session_start_datetime")[y:])
    if request.method == 'POST':    
        submitted_data = SessionListFormSet(data=request.POST)
        if submitted_data.is_valid():
            for session in submitted_data:
              new_session = session.save(commit=False)
              new_session.anaesthetist_id = request.user
              new_session.save()

其中的 x 和 y 用于反转查询集并按降序给我最后 10 个结果，以便您在表单集的底部添加一个新会话，通常是后一个会话。这是一个风格的boge

问题是当我尝试保存或编辑表单时，我得到：

IntegrityError at /trainee/dataentry/
NOT NULL constraint failed: trainee_session_log.session_end_datetime

但我可以通过在保存循环中添加“如果不是无”来避免它：

bodged views.py

if request.method == 'POST':    
    submitted_data = SessionListFormSet(data=request.POST)
    if submitted_data.is_valid():
        for session in submitted_data:
                new_session = session.save(commit=False)
                new_session.anaesthetist_id = request.user
                if new_session.session_end_datetime is not None:
                    new_session.save()

我真的不知道为什么只有那个领域会导致问题。显然，这是一个完全的错误

我真的很傻吗？

Answer 1

您尚未为各个字段定义null=True。如果您希望 Django 在数据库中保存空值，那么您可以更改这些行，

session_start_datetime = models.DateTimeField(null=True, blank=True)
session_end_datetime = models.DateTimeField(null=True, blank=True)