Question

注意：Django / Python初学者，希望这个问题很清楚。

我创建了一个表单，可以在一个表单中一次编辑模型（Guest）的多个实例，并同时提交。

此Guest模型链接到父模型Invite，表示多个Guest连接到单个Invite。

我已经设法为每个访客创建了一个formset并显示它，但是当我提交它时，我收到以下错误。

NOT NULL constraint failed: app_guest.invite_id

我假设这是因为它没有邀请保存数据，但是我无法确定将invite_id放在哪里＆＃ 39; s要求。

到目前为止，我的观点是：

def extra_view(request, code):
    # Get the specific invite
    invite = get_invite(code)

    # Get guests attached to this invite
    guests = invite.guest_set.all()

    # Get the context from the request.
    context = RequestContext(request)

    # Store object of guests marked as attending
    guests_attending = invite.guest_set.filter(attending=True, invite=invite)

    form = ExtraForm(data=request.POST or None)

    if form.is_valid():
        # Save the new category to the database.
        ### FAILS HERE
        form.save(commit=True)

        # Go to Confirm page
        HttpResponseRedirect('confirm')
    else:
        # The supplied form contained errors - just print them to the terminal for now
        print form.errors

    if guests_attending.count() > 1:
        # If the request was not a POST, display the form to enter details.
        guest_formset = modelformset_factory(Guest, form=ExtraForm, extra=0, max_num=guests_attending.count())

        # Filter the formset so that only guests marked as attending are
        filtered_guest_form = guest_formset(queryset=guests.filter(attending=True))

        # Return the view
        return render_to_response('weddingapp/extra.html', {'GuestForm': filtered_guest_form, 'invite': invite, 'guests_attending': guests_attending, 'form_errors': form.errors}, context)

    else:
        # Since there's no guests to create a form for, return Confirm view
        return render(request, 'weddingapp/confirm.html', {
            'invite': invite,
        })

这是我的嘉宾模特：

@python_2_unicode_compatible
class Guest(models.Model):
    invite = models.ForeignKey(Invite, on_delete=models.CASCADE)
    guest_name = models.CharField(max_length=200)
    diet = models.CharField(max_length=250)
    transport = models.NullBooleanField(default=False, null=True)
    attending = models.NullBooleanField(null=True)

    def __str__(self):
        return self.guest_name

以下是表格：

class ExtraForm(forms.ModelForm):
    diet = forms.CharField(max_length=128, help_text="Please enter your diet restrictions", required=False)
    transport = forms.BooleanField(initial=False, help_text="Will you be needing transport?", required=False)

    # An inline class to provide additional information on the form.
    class Meta:
        # Provide an association between the ModelForm and a model
        model = Guest
        fields = ('diet', 'transport')

真的很感激任何帮助。即使是关于更好地构建所有这些的建议也会有所帮助。感谢。

Answer 1

您的表单不包含#include <stdio.h> #include <stdlib.h> void* create_2D_array (size_t x, size_t y) { int (*array)[y] = malloc( sizeof(int[x][y]) ); for (size_t i = 0; i < x; ++i) { for (size_t j = 0; j < y; ++j) { array[i][j] = (int)(i + j); } } return array; } void print_2D_array (size_t x, size_t y, int array[x][y]) { for (size_t i = 0; i < x; ++i) { for (size_t j = 0; j < y; ++j) { printf("%d ", array[i][j]); } printf("\n"); } } int main (void) { size_t x = 5; size_t y = 3; int (*arr_2D)[y]; arr_2D = create_2D_array(x, y); print_2D_array(x, y, arr_2D); free(arr_2D); return 0; }字段，因此您必须在保存到数据库之前进行设置。

invite

NOT NULL约束失败：尝试保存formset

1 个答案: