Django表单动态下拉列表创建

Question

models.py

在这里创建您的模型。

class DeviceType(models.Model):
    device_type = models.CharField(max_length=200,unique=True)

class Repair(models.Model):
    device_type                     = models.ForeignKey(DeviceType,to_field='device_type')
    submitted_by                    = models.ForeignKey(User,to_field='username')
    comments                        = models.TextField()
    repair_request_date             = models.DateField(default=datetime.now)
    repair_status                   = models.ForeignKey(RepairStatus, to_field="repair_status", null=True)
    repair_cost_estimate            = models.FloatField(null=True)

views.py

def repair_form(request):
    dlist = get_my_choices(request.user)
    if request.method == "POST":
        form = RepairForm(request.POST,device_type = dlist, submitted_by = request.user)
        #print(form)
        if form.is_valid():
            print("Inside repair form")
            post = form.save(commit=False)
            post.submitted_by = request.user
            print(post.pk)
            post.save()
            return redirect("RepairRequest")
    else:
        dlist = get_my_choices(request.user)
        print("Inside else of repair form")
        form = RepairForm( device_type = dlist, submitted_by = request.user)
        print("else form: ", form)
        return render(request, "Form_template.html", {"form": form,\
                                                      "name": "Repair Request Form"})

forms.py

class RepairForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        print("kwargs: ",kwargs)
        dlist = kwargs["device_type"]
        print("Inside init of RequestForm")
        super(RepairForm, self).__init__(*args, **kwargs)
        self.fields["device_type"] = forms.ChoiceField(choice = [dlist])
        self.fields["submitted_by"] = kwargs["submitted_by"]



    class Meta:
        print("Inside Meta of RepairForm")
        model = Repair
        print("model: ", model)
        fields = "__all__"
        print("fields: ", fields)
        exclude = ("repair_cost_estimate","repair_status","submitted_by","repair_request_date",)

我正在尝试在 django 表单中创建一个动态下拉列表。从下拉列表将仅填充与给定用户关联的数据的意义上说是动态的。就我而言，每个用户都可能随身携带一台笔记本电脑、鼠标等。我已经编写了上面显示的代码。每次执行代码时都会出现以下错误：

TypeError at /user_dashboard/RepairRequest.html
__init__() got an unexpected keyword argument 'submitted_by'
Request Method: GET
Request URL:    http://127.0.0.1:8000/user_dashboard/RepairRequest.html
Django Version: 1.11.13
Exception Type: TypeError
Exception Value:    
__init__() got an unexpected keyword argument 'submitted_by'
Exception Location: E:\inventory management\inventory_management_service\inventory_management_app\forms.py in __init__, line 15
Python Executable:  C:\Anaconda2\python.exe
Python Version: 2.7.14
Python Path:    
['E:\\inventory management\\inventory_management_service',
 'C:\\Anaconda2\\python27.zip',
 'C:\\Anaconda2\\DLLs',
 'C:\\Anaconda2\\lib',
 'C:\\Anaconda2\\lib\\plat-win',
 'C:\\Anaconda2\\lib\\lib-tk',
 'C:\\Anaconda2',
 'C:\\Users\\Jaimik Jain\\AppData\\Roaming\\Python\\Python27\\site-packages',
 'C:\\Anaconda2\\lib\\site-packages',
 'C:\\Anaconda2\\lib\\site-packages\\win32',
 'C:\\Anaconda2\\lib\\site-packages\\win32\\lib',
 'C:\\Anaconda2\\lib\\site-packages\\Pythonwin',
 'C:\\Anaconda2\\lib\\site-packages\\pywinpty-0.5-py2.7-win-amd64.egg']
Server time:    Thu, 7 Jun 2018 09:56:44 +0000

我最早请求您的帮助。

Answer 1

您的维修模型是什么样的？

如果字段device_type 是包含您的用户设备的模型的外键，我认为在您的视图中覆盖该字段查询集而不是弄乱表单初始化会容易得多。你可以这样做：

form = RepairForm()
form.fields['device_type'].queryset = MyDeviceModel.objects.filter(user=request.user)

请注意，在调用 RepairForm() 时也不需要传递 submit_by - 该字段被排除在表单本身中，并且您已经在处理您的 if form.is_valid() 块中正确填充 submitted_by 字段所以我不认为那是完成任何事情。

编辑

views.py

def repair_form(request):
    if request.method == "POST":
        form = RepairForm(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.submitted_by = request.user
            post.save()
            return redirect("RepairRequest")
    else:
       form = RepairForm()
       form.fields['device_type'].queryset = DeviceType.objects.filter(user=request.user)

       return render(request, "Form_template.html", {"form": form, "name": "Repair Request Form"})

forms.py

class RepairForm(forms.ModelForm):

   class Meta:
      model = Repair
      exclude = ( "repair_cost_estimate","repair_status","submitted_by","repair_request_date",)

Answer 2

问题在于您将参数submitted_by 和device_type 传递给RepairForm 构造函数。由于您明确提到了这些，这意味着它们存储在 kwargs 字典中。

但是，在执行super().__init__(*args, **kwargs) 调用之前，您不修改此字典。结果，超类（ModelForm）也将接收这些参数，但它确实不了解如何处理这些参数。结果会报错。

因此您需要从kwargs 中删除这些参数。例如.pop(..):

class RepairForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        dlist = kwargs.pop("device_type")
        submitted_by = kwargs.pop("submitted_by")
        super(RepairForm, self).__init__(*args, **kwargs)
        self.fields["device_type"] = forms.ChoiceField(choices=[dlist])
        self.fields["submitted_by"] = submitted_by

在初始化ChoiceField 时，您还应该使用choices=... 作为参数，而不是choice=...。

我认为有多个额外的错误，但我希望这能提供一些好的方向。