Python 如何筛选当前登录用户的Django表单下拉列表（基于类的视图）

我有两个模型，Fillup和Car，Fillup模型有一个外键（例如，用于记录汽车加油的时间），在创建新的Fillup的表单中，我想将Car字段的下拉列表限制为仅与当前用户关联的汽车，但现在它显示的是所有用户的汽车。我已经看到了一些解决方案，涉及将请求从视图传递到表单中，但我不知道如何使用我当前设置的基于类的视图来完成。这是我的密码：

型号.py

class Fillup(models.Model):
    username = models.ForeignKey(User,on_delete=models.CASCADE)
    date = models.DateField(default=date.today)
    price_per_gallon = models.FloatField()
    trip_distance = models.FloatField()
    gallons = models.FloatField()
    car = models.ForeignKey('Car',on_delete=models.CASCADE)

    @property
    def total_sale(self):
        return round(self.price_per_gallon*self.gallons, 2)

    @property
    def mpg(self):
        return round(self.trip_distance/self.gallons, 4)


class Car(models.Model):
    username = models.ForeignKey(User,on_delete=models.CASCADE)
    name = models.CharField(max_length=25)
    make = models.CharField(max_length=25)
    model = models.CharField(max_length=25)
    model_year = models.IntegerField(choices=MODEL_YEARS)
    status = models.BooleanField(choices=STATUS)

    def __str__(self):
        return self.name

class FillupListView(ListView):
    model = Fillup
    context_object_name = 'fillup_list'
    ordering = ['-date']

    # NOT USING THIS YET
    # def get_queryset(self):
    #     return Fillup.objects.filter(user=self.request.user)

class CarListView(ListView):
    model = Car
    ordering = ['name']

class NewFillup(LoginRequiredMixin,CreateView):
    model = Fillup
    fields = ('date', 'price_per_gallon', 'trip_distance', 'gallons', 'car')
    redirect_field_name = 'fillup_list'

    def form_valid(self, form):
        form.instance.username = self.request.user
        return super().form_valid(form)

class NewCar(LoginRequiredMixin,CreateView):
    model = Car
    fields = ('name', 'make', 'model', 'model_year', 'status')
    redirect_field_name = 'car_list'

    def form_valid(self, form):
        form.instance.username = self.request.user
        return super().form_valid(form)

class FillupForm(forms.ModelForm):

    def __init__(self, user, *args, **kwargs):
        super(FillupForm,self).__init__(*args, **kwargs)
        self.fields['car'].queryset = Car.objects.filter(username=user)

    class Meta():
        model = Fillup
        fields = ('date', 'price_per_gallon', 'trip_distance', 'gallons', 'car')


class CarForm(forms.ModelForm):

    class Meta():
        model = Car
        fields = ('name', 'make', 'model', 'model_year', 'status')

视图.py

class Fillup(models.Model):
    username = models.ForeignKey(User,on_delete=models.CASCADE)
    date = models.DateField(default=date.today)
    price_per_gallon = models.FloatField()
    trip_distance = models.FloatField()
    gallons = models.FloatField()
    car = models.ForeignKey('Car',on_delete=models.CASCADE)

    @property
    def total_sale(self):
        return round(self.price_per_gallon*self.gallons, 2)

    @property
    def mpg(self):
        return round(self.trip_distance/self.gallons, 4)


class Car(models.Model):
    username = models.ForeignKey(User,on_delete=models.CASCADE)
    name = models.CharField(max_length=25)
    make = models.CharField(max_length=25)
    model = models.CharField(max_length=25)
    model_year = models.IntegerField(choices=MODEL_YEARS)
    status = models.BooleanField(choices=STATUS)

    def __str__(self):
        return self.name

class FillupListView(ListView):
    model = Fillup
    context_object_name = 'fillup_list'
    ordering = ['-date']

    # NOT USING THIS YET
    # def get_queryset(self):
    #     return Fillup.objects.filter(user=self.request.user)

class CarListView(ListView):
    model = Car
    ordering = ['name']

class NewFillup(LoginRequiredMixin,CreateView):
    model = Fillup
    fields = ('date', 'price_per_gallon', 'trip_distance', 'gallons', 'car')
    redirect_field_name = 'fillup_list'

    def form_valid(self, form):
        form.instance.username = self.request.user
        return super().form_valid(form)

class NewCar(LoginRequiredMixin,CreateView):
    model = Car
    fields = ('name', 'make', 'model', 'model_year', 'status')
    redirect_field_name = 'car_list'

    def form_valid(self, form):
        form.instance.username = self.request.user
        return super().form_valid(form)

class FillupForm(forms.ModelForm):

    def __init__(self, user, *args, **kwargs):
        super(FillupForm,self).__init__(*args, **kwargs)
        self.fields['car'].queryset = Car.objects.filter(username=user)

    class Meta():
        model = Fillup
        fields = ('date', 'price_per_gallon', 'trip_distance', 'gallons', 'car')


class CarForm(forms.ModelForm):

    class Meta():
        model = Car
        fields = ('name', 'make', 'model', 'model_year', 'status')

forms.py

class Fillup(models.Model):
    username = models.ForeignKey(User,on_delete=models.CASCADE)
    date = models.DateField(default=date.today)
    price_per_gallon = models.FloatField()
    trip_distance = models.FloatField()
    gallons = models.FloatField()
    car = models.ForeignKey('Car',on_delete=models.CASCADE)

    @property
    def total_sale(self):
        return round(self.price_per_gallon*self.gallons, 2)

    @property
    def mpg(self):
        return round(self.trip_distance/self.gallons, 4)


class Car(models.Model):
    username = models.ForeignKey(User,on_delete=models.CASCADE)
    name = models.CharField(max_length=25)
    make = models.CharField(max_length=25)
    model = models.CharField(max_length=25)
    model_year = models.IntegerField(choices=MODEL_YEARS)
    status = models.BooleanField(choices=STATUS)

    def __str__(self):
        return self.name

class FillupListView(ListView):
    model = Fillup
    context_object_name = 'fillup_list'
    ordering = ['-date']

    # NOT USING THIS YET
    # def get_queryset(self):
    #     return Fillup.objects.filter(user=self.request.user)

class CarListView(ListView):
    model = Car
    ordering = ['name']

class NewFillup(LoginRequiredMixin,CreateView):
    model = Fillup
    fields = ('date', 'price_per_gallon', 'trip_distance', 'gallons', 'car')
    redirect_field_name = 'fillup_list'

    def form_valid(self, form):
        form.instance.username = self.request.user
        return super().form_valid(form)

class NewCar(LoginRequiredMixin,CreateView):
    model = Car
    fields = ('name', 'make', 'model', 'model_year', 'status')
    redirect_field_name = 'car_list'

    def form_valid(self, form):
        form.instance.username = self.request.user
        return super().form_valid(form)

class FillupForm(forms.ModelForm):

    def __init__(self, user, *args, **kwargs):
        super(FillupForm,self).__init__(*args, **kwargs)
        self.fields['car'].queryset = Car.objects.filter(username=user)

    class Meta():
        model = Fillup
        fields = ('date', 'price_per_gallon', 'trip_distance', 'gallons', 'car')


class CarForm(forms.ModelForm):

    class Meta():
        model = Car
        fields = ('name', 'make', 'model', 'model_year', 'status')

---

在FillupForm中重写init方法只是我试图让它工作的事情之一，这是根据另一个Stackoverflow答案改编的，但它似乎没有任何效果。如有任何建议/示例可使此工作正常进行，我们将不胜感激！如果我需要提供更多的代码，请告诉我。您可以在init方法中执行类似操作

        cars = Car.objects.filter(username=user)
        self.fields['car'].autocomplete = False
        self.fields['car'].queryset = users

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希望这能有所帮助。

我最终从r/Django在Reddit上的学习中得到了答案

我需要将以下内容添加到我的两个CreateView中：

def get_form_kwargs(self):
    kwargs = super().get_form_kwargs()
    kwargs['user'] = self.request.user
    return kwargs

他们还指出，我需要用form_class=forms.Fillup/Car替换两个createview上的字段=（'blah blah blah'）

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我希望这能帮助和我有同样问题的人

谢谢你的回复！我最终从reddit上的一个用户那里得到了我需要的答案。我把他们给我的答案留在这里作为答案，这样可以帮助其他人在他们的代码中解决同样的问题