Django 将父对象传递到子对象的CreateView

我正在创建一个仪表板来编辑旅游应用程序

每次巡演我都有一个子记录，我在其中定义了步骤。这两种型号如下所示：

型号.py

class Tour(models.Model):
    tour_id = models.CharField(primary_key=True,unique=True, max_length=10)
    country = models.ForeignKey(Countries, models.DO_NOTHING, db_column='country')
    language = models.ForeignKey(Language, models.DO_NOTHING, db_column='language')
    lastupddtm = models.DateTimeField(default=timezone.now)
    productid = models.CharField(max_length=50)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=100)
    descrlong = models.CharField(max_length=1000)
    live = models.CharField(max_length=1)
    image = models.ImageField(upload_to=upload_tour_image, storage=OverwriteStorage(), blank=True, null=True)

    class Meta:
        db_table = 'tour'
        verbose_name_plural = "tour"


    def get_language_flag(self):
        return self.language.flag.url

    def __str__(self):
        return str(self.tour_id) + ' - ' + str(self.title) + ' - ' + str(self.description)



class Toursteps(models.Model):
    # tour_id = models.OneToOneField(Tour, models.DO_NOTHING, db_column='tour_id')
    tour = models.ForeignKey(Tour, related_name='toursteps', on_delete=models.CASCADE)
    step = models.IntegerField(unique=True)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=100)
    descrlong = models.CharField(max_length=1000)
    audiotext = models.TextField()
    latitude = models.FloatField()
    longitude = models.FloatField()
    radius = models.FloatField()
    image = models.ImageField(upload_to=upload_tour_step_image, blank=True, null=True)

    class Meta:
        db_table = 'tourSteps'
        verbose_name_plural = "tourSteps"

    def __str__(self):
        return str(self.tour) + "|" + str(self.step)

urlpatterns = [
    path('tour/<str:pk>/detail', views.TourDetailView.as_view(), name='tour_detail'),
    path('tour/<str:pk>/edit', views.UpdateTourView.as_view(), name='tour_edit'),
    path('tour/<str:pk>/remove', views.DeleteTourView.as_view(), name='tour_remove'),
    path('tour/<str:tour_id>/step/new', views.CreateTourStepView.as_view(), name='tour_step_new')
]

class CreateTourStepView(LoginRequiredMixin,CreateView):
    login_url = '/login/'
    redirect_field_name = 'tour_admin/tour_list.html'
    success_url = '/'
    form_class = TourStepForm
    model = Toursteps

    def get_context_data(self, **kwargs):
        context = super(CreateTourStepView, self).get_context_data(**kwargs)
        print(context['tour_id'])
        return context

class TourStepForm(forms.ModelForm):

    class Meta():
        model = Toursteps
        #fields = '__all__'
        exclude = ('tour',)

    def form_valid(self, form):
        if form.is_valid():
            form.instance.tour_id = self.request.GET("tour_id")

            form.instance.save()

            return HttpResponseRedirect(self.get_success_url())

    def get_success_url(self):
        return reverse('tour_detail', kwargs={'pk':form.instance.tour_id})

创建巡更后，我转到详细信息页面。从那里，我可以单击一个链接来添加此教程的步骤。 这就是问题所在。我将tour_id作为变量传递到url中，但在步骤的CreateView中找不到获取它的方法

url.py

class Tour(models.Model):
    tour_id = models.CharField(primary_key=True,unique=True, max_length=10)
    country = models.ForeignKey(Countries, models.DO_NOTHING, db_column='country')
    language = models.ForeignKey(Language, models.DO_NOTHING, db_column='language')
    lastupddtm = models.DateTimeField(default=timezone.now)
    productid = models.CharField(max_length=50)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=100)
    descrlong = models.CharField(max_length=1000)
    live = models.CharField(max_length=1)
    image = models.ImageField(upload_to=upload_tour_image, storage=OverwriteStorage(), blank=True, null=True)

    class Meta:
        db_table = 'tour'
        verbose_name_plural = "tour"


    def get_language_flag(self):
        return self.language.flag.url

    def __str__(self):
        return str(self.tour_id) + ' - ' + str(self.title) + ' - ' + str(self.description)



class Toursteps(models.Model):
    # tour_id = models.OneToOneField(Tour, models.DO_NOTHING, db_column='tour_id')
    tour = models.ForeignKey(Tour, related_name='toursteps', on_delete=models.CASCADE)
    step = models.IntegerField(unique=True)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=100)
    descrlong = models.CharField(max_length=1000)
    audiotext = models.TextField()
    latitude = models.FloatField()
    longitude = models.FloatField()
    radius = models.FloatField()
    image = models.ImageField(upload_to=upload_tour_step_image, blank=True, null=True)

    class Meta:
        db_table = 'tourSteps'
        verbose_name_plural = "tourSteps"

    def __str__(self):
        return str(self.tour) + "|" + str(self.step)

urlpatterns = [
    path('tour/<str:pk>/detail', views.TourDetailView.as_view(), name='tour_detail'),
    path('tour/<str:pk>/edit', views.UpdateTourView.as_view(), name='tour_edit'),
    path('tour/<str:pk>/remove', views.DeleteTourView.as_view(), name='tour_remove'),
    path('tour/<str:tour_id>/step/new', views.CreateTourStepView.as_view(), name='tour_step_new')
]

class CreateTourStepView(LoginRequiredMixin,CreateView):
    login_url = '/login/'
    redirect_field_name = 'tour_admin/tour_list.html'
    success_url = '/'
    form_class = TourStepForm
    model = Toursteps

    def get_context_data(self, **kwargs):
        context = super(CreateTourStepView, self).get_context_data(**kwargs)
        print(context['tour_id'])
        return context

class TourStepForm(forms.ModelForm):

    class Meta():
        model = Toursteps
        #fields = '__all__'
        exclude = ('tour',)

    def form_valid(self, form):
        if form.is_valid():
            form.instance.tour_id = self.request.GET("tour_id")

            form.instance.save()

            return HttpResponseRedirect(self.get_success_url())

    def get_success_url(self):
        return reverse('tour_detail', kwargs={'pk':form.instance.tour_id})

forms.py

class Tour(models.Model):
    tour_id = models.CharField(primary_key=True,unique=True, max_length=10)
    country = models.ForeignKey(Countries, models.DO_NOTHING, db_column='country')
    language = models.ForeignKey(Language, models.DO_NOTHING, db_column='language')
    lastupddtm = models.DateTimeField(default=timezone.now)
    productid = models.CharField(max_length=50)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=100)
    descrlong = models.CharField(max_length=1000)
    live = models.CharField(max_length=1)
    image = models.ImageField(upload_to=upload_tour_image, storage=OverwriteStorage(), blank=True, null=True)

    class Meta:
        db_table = 'tour'
        verbose_name_plural = "tour"


    def get_language_flag(self):
        return self.language.flag.url

    def __str__(self):
        return str(self.tour_id) + ' - ' + str(self.title) + ' - ' + str(self.description)



class Toursteps(models.Model):
    # tour_id = models.OneToOneField(Tour, models.DO_NOTHING, db_column='tour_id')
    tour = models.ForeignKey(Tour, related_name='toursteps', on_delete=models.CASCADE)
    step = models.IntegerField(unique=True)
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=100)
    descrlong = models.CharField(max_length=1000)
    audiotext = models.TextField()
    latitude = models.FloatField()
    longitude = models.FloatField()
    radius = models.FloatField()
    image = models.ImageField(upload_to=upload_tour_step_image, blank=True, null=True)

    class Meta:
        db_table = 'tourSteps'
        verbose_name_plural = "tourSteps"

    def __str__(self):
        return str(self.tour) + "|" + str(self.step)

urlpatterns = [
    path('tour/<str:pk>/detail', views.TourDetailView.as_view(), name='tour_detail'),
    path('tour/<str:pk>/edit', views.UpdateTourView.as_view(), name='tour_edit'),
    path('tour/<str:pk>/remove', views.DeleteTourView.as_view(), name='tour_remove'),
    path('tour/<str:tour_id>/step/new', views.CreateTourStepView.as_view(), name='tour_step_new')
]

class CreateTourStepView(LoginRequiredMixin,CreateView):
    login_url = '/login/'
    redirect_field_name = 'tour_admin/tour_list.html'
    success_url = '/'
    form_class = TourStepForm
    model = Toursteps

    def get_context_data(self, **kwargs):
        context = super(CreateTourStepView, self).get_context_data(**kwargs)
        print(context['tour_id'])
        return context

class TourStepForm(forms.ModelForm):

    class Meta():
        model = Toursteps
        #fields = '__all__'
        exclude = ('tour',)

    def form_valid(self, form):
        if form.is_valid():
            form.instance.tour_id = self.request.GET("tour_id")

            form.instance.save()

            return HttpResponseRedirect(self.get_success_url())

    def get_success_url(self):
        return reverse('tour_detail', kwargs={'pk':form.instance.tour_id})

---

首先，您的

form\u valid（）

和

get\u success\u url（）

方法属于您的视图，而不属于您的表单

其次，

tour\u id

被传递给视图的

kwargs

，它不是查询参数，因此不在

self.request.GET

中。您可以在

self.kwargs

中找到它

第三，您需要从数据库中实际获取

Tour

，而不仅仅是分配

Tour\u id

。如果我愿意，我可以发布到任何

tour\u id

，并且不能保证

tour\u id

属于实际的

tour

对象。如果巡演不存在，则返回404。如果存在，则将其指定给巡更步骤

---

最后，您不应该分配和保存

form.instance

。您应该使用

step=form.save（commit=False）

获取实例，然后分配到

step

并保存

step

，因为

tour\u id

是您的url模式的一部分，它在视图的

kwargs

中（

self.kwargs

），而不是在

请求中。get

（这些是查询参数）。谢谢！这帮了大忙。self.kwargs就是答案，我基本上可以删除您提到的其余代码。不需要获取tour_id，因为检查已经通过外键构造在数据库级别上完成。检查已经完成，但在保存时会抛出数据库完整性错误，这不是一个很好的用户体验（还因为在日志中，除了用户输入外，实际上没有任何错误，因此会引发错误）。返回404是一种更好的体验。