Python 在视图上动态地将子对象与父对象关联

我有两个模型，Usermodel和Measurements模型。度量模型通过ForeignKey关系与Usermodel相关联。我已经成功地创建了允许创建用户的表单，但是希望在查看这些用户时，您可以从那里创建度量，而不指示关系，因为它应该自动使用当前显示为实例的Usermodel并将其关联。这一直是一个问题。我试着这样写观点

View.py 这不会保存到数据库。我是django的新手，请问我做错了什么

Model.py Form.py

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以下是我如何改变你的观点，做你想做的事。注意，模板上下文现在的客户机密钥是user，而不是

measurement

def client_measurements(request, pk):
    client = UserModel.objects.prefetch_related('measurements_set').get(id=pk)
    measurements = client.measurements_set.all()
    if request.method == 'POST':
        form = MeasurementsIForm(request.POST, request.FILES)

        if form.is_valid():
            measurement = form.save(commit=False)
            measurement.client_name = client
            measurement.save()
            return HttpResponseRedirect(reverse_lazy('client', args=   [measurement.id]))
    else:
        form = MeasurementsIForm()
    return render(request, 'app/measurements.html', {'form':form,      'measurements': measurements, 'client': client})

另外，我强烈建议将您的测量模型更改为：

class Measurement(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
    client = models.ForeignKey(UserModel, on_delete=models.CASCADE)

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应命名ForeignKey属性，以便表示相关模型实例，而不是它们的属性。当使用ORM时，你应该利用抽象，而不是对抗抽象。

只是再次检查了这段代码，使用前面的答案，我成功地让它工作。我不知道为什么它以前不起作用，因为我最初就是这样做的

新观点

---

如果有更好的解决办法，我很想知道。谢谢。

请包括您的模型和

measurementsform

。class-measurementsform（forms.ModelForm）：class-Meta:model=measures字段='all'排除=['user\u name'，'client\u name']。由于某些原因，我无法让表单代码像初始代码一样显示。请原谅，请在问题中加入您的模型。我已经用您可能需要的所有必要信息更新了问题。谢谢你的回复。。我试过了，但又犯了一个错误。“UserModel匹配查询不存在。”

class ClientForm(forms.ModelForm):
client_name = forms.RegexField(regex=re.compile(r'[A-Z][a-z]+((\s[A-Z]([a-z]+)?)?)((\s[A-Z]([a-z]+)?)?)'), required=True, error_messages={'invalid': "Each name must be Capitalized. E.g 'Kelly Roland' not 'kelly roland'"}, label="Client's Full Name")
tel = forms.RegexField(regex=re.compile(r'(080|090|070|081)[0-9]{8}'), required=False, error_messages={'invalid': "Enter a valid phone number"}, label="Phone No")
class Meta:
    model = UserModel
    widgets = {
        "tel": TextInput(),
        "client_name": TextInput(attrs={"placeholder": "Emanuel Felix Johnson"})
    }
    labels = {
        "client_name": "Client's FullName",
        "tel": "Phone No",
        "client_gender": "Gender"
    }

    fields = ('client_name', 'client_gender', 'address', 'tel', 'image' )

class MeasurementsIForm(forms.ModelForm):
class Meta:
    model = Measurements
    fields = '__all__'
    exclude = ['user_name', 'client_name']

def client_measurements(request, pk):
    client = UserModel.objects.prefetch_related('measurements_set').get(id=pk)
    measurements = client.measurements_set.all()
    if request.method == 'POST':
        form = MeasurementsIForm(request.POST, request.FILES)

        if form.is_valid():
            measurement = form.save(commit=False)
            measurement.client_name = client
            measurement.save()
            return HttpResponseRedirect(reverse_lazy('client', args=   [measurement.id]))
    else:
        form = MeasurementsIForm()
    return render(request, 'app/measurements.html', {'form':form,      'measurements': measurements, 'client': client})

class Measurement(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
    client = models.ForeignKey(UserModel, on_delete=models.CASCADE)

@login_required
def client_measurements(request, pk):
    client = UserModel.objects.get(id=pk)
    measurements = client.measurements_set.all()
    if request.method == 'POST':
        form = MeasurementsUpdateForm(request.POST, request.FILES)
        if form.is_valid():

            measurement = form.save(commit=False)
            measurement.user_name = request.user
            measurement.client_name = client
            measurement.save()

        return HttpResponseRedirect(reverse_lazy('client', args=   [client.id]))
else:
    form = MeasurementsUpdateForm()
return render(request, 'app/measurements.html', {'form':form, 'measurements': measurements, 'client': client})