我想将一个模型的非str对象提取到另一个模型中...
这是我的模特
class Selectdatefield(models.Model):
User = models.OneToOneField(settings.AUTH_USER_MODEL,related_name="Users",on_delete=models.CASCADE,null=True,blank=True)
Start_Date = models.DateField(blank=True, null=True)
End_Date = models.DateField(blank=True, null=True)
class Journal(models.Model):
User = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE,null=True,blank=True)
company = models.ForeignKey(Company,on_delete=models.CASCADE,null=True,blank=True,related_name='Companyname')
start_date = models.ForeignKey(Selectdatefield,on_delete=models.CASCADE,null=True,blank=True,related_name='startdate')
end_date = models.ForeignKey(Selectdatefield,on_delete=models.CASCADE,null=True,blank=True,related_name='enddate')
Date = models.DateField()
By = models.ForeignKey(Ledger1,on_delete=models.CASCADE,related_name='Debitledgers')
To = models.ForeignKey(Ledger1,on_delete=models.CASCADE,related_name='Creditledgers')
Debit = models.DecimalField(max_digits=10,decimal_places=2)
Credit = models.DecimalField(max_digits=10,decimal_places=2)
我已经在日记创建视图中尝试过此操作:
class journalCreateView(LoginRequiredMixin,CreateView):
model = journal
form_class = journalForm
def form_valid(self, form):
form.instance.User = self.request.user
c = company.objects.get(pk=self.kwargs['pk'])
form.instance.Company = c
s = selectdatefield.objects.get(pk=self.kwargs['pk3'])
form.instance.start_date = s
form.instance.end_date = s.End_Date
return super(journalCreateView, self).form_valid(form)
我想在提交日记帐表单时在我的日记帐模型中自动获取selectdate的结束日期...
但是出现此错误:
ValueError: Cannot assign "datetime.date(2018, 10, 6)": "journal.end_date" must be a "selectdatefield" instance.
该代码行中有错误:
form.instance.end_date = s.End_Date
有人可以告诉我我的代码在做什么错吗?
答案 0 :(得分:2)
需要为Django中的外键分配一个对象,而不是值。该错误告诉您您正在尝试将DateTime
值分配给一个仅接受Selectdatefield
对象的字段。
由于您已经有一个带有值的Selectdatefield
对象,因此可以直接对其进行分配,就像对start_date
属性所做的那样:
form.instance.start_date = s
form.instance.end_date = s