Question

因此，我对Django非常陌生，我正在尝试保存模型Ovelse的新实例，该实例具有指向另一个模型Okt的外键。我有一个视图，其中包含所有Okt实例的列表，该列表链接到连接到每个Okt的所有Ovelse实例。

Models.py

class Okt(models.Model):

def __str__(self):
    return '{}, uke {}, dag {}'.format(self.sykel_navn, self.sykel_uke, self.sykel_dag)


sykel_navn = models.CharField(max_length=8, default="Sykel 1")
sykel_dag = models.CharField(max_length=(1), choices=(SYKEL_DAGER))
sykel_uke = models.CharField(max_length=(1), choices=(SYKEL_UKER))
dato = models.DateTimeField('Dato på treningsøkt: ')
notater = models.CharField(max_length=400)


class Ovelse(models.Model):

okt = models.ForeignKey(Okt, on_delete=models.CASCADE)
ovelse_type = models.CharField(max_length=2, choices=MUSKELGRUPPE_CHOICES)
ovelse_navn = models.CharField(max_length=20)
vekt = models.IntegerField(default=0, name='kg')
sets = models.PositiveIntegerField(default=2)
reps = models.PositiveIntegerField(default=2)

def __str__(self):
    return self.ovelse_navn

views.py

class OvelseCreateView(generic.CreateView):
model = Ovelse
template_name = 'trening/add.html'
form_class = OvelseForm

def form_valid(self, form):
    form.instance.okt = self.kwargs.get('pk')
    return super(OvelseCreateView, self).form_valid(form)

forms.py

class OvelseForm(forms.ModelForm):

class Meta:
    model = Ovelse
    exclude = ['okt',]
    fields = ['ovelse_navn', 'ovelse_type', 'kg', 'sets', 'reps']

def __init__(self, *args, **kwargs):
    super(OvelseForm, self).__init__(*args, **kwargs)
    self.fields['ovelse_type'].label = "Muskler brukt"
    self.fields['ovelse_navn'].label = "Navn på øvelsen"
    self.fields['kg'].label = "Antall kilo"
    self.fields['sets'].label = "Antall set"
    self.fields['reps'].label = "Antall reps"

当我尝试提交表单时，收到错误消息：无法分配“ 1”：“ Ovelse.okt”必须是“ Okt”实例，而我希望创建该实例的新模型。

Answer 1

由于您自己是在“注入”主键而不是{ "entries": [ { "jason": { "added": true } } ] }对象，因此应在Okt上使用.okt_id：

.okt

请注意，您可以在表单的class OvelseCreateView(generic.CreateView): model = Ovelse template_name = 'trening/add.html' form_class = OvelseForm def form_valid(self, form): form.instance.okt_id = self.kwargs.get('pk') return super(OvelseCreateView, self).form_valid(form)类中设置标签，而无需为此覆盖Meta文件：

__init__

ValueError：无法分配：必须是实例

1 个答案: