无法更新Django中的单个项目

debugcn 发表于 Dev

编码员

我正在尝试更新Django应用程序中的某些信息，但出现此错误“无法分配“ 9”：“ Reservation.table”必须是“ Tables”实例”。

我也尝试过这样的手动方法，但它仍然是相同的错误。

错误：无法分配“ 9”：“ Reservation.table”必须是“ Tables”实例

views.py

@login_required
def UpdateReservation(request, pk):
    table_exists = get_object_or_404(Reservation, id=pk)
    form = ReservationForm(instance=table_exists)
    
    if request.method == "POST":
        form = ReservationForm(request.POST, instance=table_exists)
        if form.is_valid():
            form = ReservationForm(request.POST, instance=table_exists)
            if form.is_valid():
                form.save()
                return redirect('view_reservations')
                messages.success(request, "successfully updated table")
    context = {"form": form}
    return render(request, "dashboard/super/landlord/update_reserve.html", context)

models.py

class Reservation(models.Model):

    status_choices = (
        ("pending", "pending"), 
        ("confirmed", "confirmed")
    )

    first_name = models.CharField(max_length=200)
    last_name = models.CharField(max_length=200)
    email = models.EmailField()
    phone = PhoneNumberField(blank=True)
    people = models.IntegerField(default=1)
    time = models.TimeField()
    date_reserved = models.DateField()
    date_booked = models.DateTimeField(auto_now_add=True)
    status = models.CharField(max_length=10, choices=status_choices, default="confirmed")
    comment = models.TextField(blank=True)
    table = models.ForeignKey(Tables, on_delete=models.CASCADE)

    def __str__(self):
        return self.first_name

表格

class ReservationForm(forms.ModelForm):
    time = forms.CharField(
        widget=forms.TextInput(attrs={'id': 'timepicker',
                                      'class': 'input-group',
                                      'placeholder': '12:00:AM'}))
    date_reserved = forms.DateField(widget=forms.TextInput(
        attrs={'placeholder': 'yyyy-mm-dd',
               'id': 'datepicker'}), required=True,)
    comment = forms.CharField(widget=forms.TextInput(
        attrs={'placeholder': 'Leave a message'}), required=True,)
    first_name = forms.CharField(widget=forms.TextInput(
        attrs={'placeholder': 'Leave a message'}), required=False,)
    email = forms.CharField(widget=forms.TextInput(
        attrs={'placeholder': 'Your Email Address'}), required=True,)
    phone = forms.CharField(widget=forms.TextInput(
        attrs={'placeholder': 'Your Telephone number'}), required=True,)
    table = forms.IntegerField(widget=forms.TextInput(
        attrs={'placeholder': 'Table Number'}), required=True,)

    class Meta:
        model = Reservation
        fields = ['first_name', 'email', 'time', 'comment',
                  'phone', 'date_reserved', 'people', 'table']

template.html

<div class="panel-body">
    <form class="form-horizontal" role="form" method="post" enctype="multipart/form-data">
        {% csrf_token %}
        {% for field in form %}                                   
        <div class="form-group">
            <label class="col-md-2 control-label">{{ field.label }}</label>
            <div class="col-md-10">
                {{ field|attr:'class:form-control'}}
            </div>
        </div>
        {% endfor %}
        <div class="form-group">
            <div class="col-md-10">
                <center><button class="btn btn-primary" type="submit">Update Reservation</button></center>
            </div>
        </div>
    </div>

电磁场

在表单中，从上方的字段列表中删除表格字段，但将其保留在Meta中，因为值在Integer中，并且必须分配一个对象，因此将其弄乱了。

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