Django EditStamdata() 得到了一个意外的关键字参数 'instance'

Question

他,

加载表单时出现错误：

from django import forms
from .models import CountryList, Stamdata
from django.db.models.functions import Lower
from django.contrib.auth.models import User

class EditStamdata(forms.ModelForm):
    Firmanavn = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control', 'autofocus': True}), label='Firmanavn')
    EMail = forms.EmailField(widget=forms.EmailInput(attrs={'class': 'form-control', 'autofocus': True}), label='EMail')
    Bank = forms.CharField(widget=forms.Textarea(attrs={'rows' :'4', 'class': 'form-control', 'autofocus': True}), label='Bank')
    Navn = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control', 'autofocus': True}), label='Navn')
    Adresse = forms.CharField(widget=forms.Textarea(attrs={'rows' :'4', 'class': 'form-control'}),label='Adresse')
    Land = forms.ModelChoiceField(widget=forms.Select(attrs={'class': 'form-control'}),queryset=CountryList.objects.values_list('countryname', flat=True).order_by('code'), initial='Denmark', to_field_name='countryname')
    CVRCountrycode = forms.ModelChoiceField(widget=forms.Select(attrs={'class': 'form-control col-md-4'}),label='CVR Landkode', queryset=CountryList.objects.values_list('code', flat=True).order_by('code'), initial='DK', to_field_name='code')
    CVR = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control'}),label='CVR Nummer')
    class Meta:
        model = Stamdata
        labels = {
            'Byen': 'By',
            'CVRCountrycode': 'Landekode',
            'CVR': 'CVR Nummer',
            }
        fields = ['Firmanavn', 'UserID', 'Adresse', 'Land', 'CVRCountrycode', 'CVR', 'EMail', 'Bank', 'Navn']

和视图：

def EditStamdata(request):
    StamdataData = get_object_or_404(Stamdata, pk=1)
# if this is a POST request we need to process the form data
    if request.method == 'POST':
        form = EditStamdata(request.POST, instance=StamdataData)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect('backend/stamdata.html')
    else:
        print ('somethin goes wrong')
        form = EditStamdata(instance=StamdataData)
    return render(
        request,
        'backend/stamdata.html', 
        {'form':  form },
    )

然后我收到此错误消息：

EditStamdata() 得到了意外的关键字参数 'instance'

如果我 google 如果他们使用 forms.ModelForm 就有人修复它，但我使用它。

Answer 1

您为视图指定了与表单相同的名称，因此 Django 调用了视图函数。因此，您应该至少重命名两者之一。

一般在Python中，函数都写在snake_case中，所以可以将EditStamdata重命名为edit_stamdata。此外，Django 表单通常有一个 Form 后缀。因此，您可以将表单重命名为 EditStamdataForm:

# app/forms.py

from django import forms
from .models import CountryList, Stamdata
from django.db.models.functions import Lower
from django.contrib.auth.models import User

class EditStamdata<b>Form</b>(forms.ModelForm):
    Firmanavn = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control', 'autofocus': True}), label='Firmanavn')
    EMail = forms.EmailField(widget=forms.EmailInput(attrs={'class': 'form-control', 'autofocus': True}), label='EMail')
    Bank = forms.CharField(widget=forms.Textarea(attrs={'rows' :'4', 'class': 'form-control', 'autofocus': True}), label='Bank')
    Navn = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control', 'autofocus': True}), label='Navn')
    Adresse = forms.CharField(widget=forms.Textarea(attrs={'rows' :'4', 'class': 'form-control'}),label='Adresse')
    Land = forms.ModelChoiceField(widget=forms.Select(attrs={'class': 'form-control'}),queryset=CountryList.objects.values_list('countryname', flat=True).order_by('code'), initial='Denmark', to_field_name='countryname')
    CVRCountrycode = forms.ModelChoiceField(widget=forms.Select(attrs={'class': 'form-control col-md-4'}),label='CVR Landkode', queryset=CountryList.objects.values_list('code', flat=True).order_by('code'), initial='DK', to_field_name='code')
    CVR = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control'}),label='CVR Nummer')
    class Meta:
        model = Stamdata
        labels = {
            'Byen': 'By',
            'CVRCountrycode': 'Landekode',
            'CVR': 'CVR Nummer',
            }
        fields = ['Firmanavn', 'UserID', 'Adresse', 'Land', 'CVRCountrycode', 'CVR', 'EMail', 'Bank', 'Navn']

在视图中，我们更改视图的名称，并为表单使用新名称：

def <b>edit_stamdata</b>(request):
    StamdataData = get_object_or_404(Stamdata, pk=1)
    if request.method == 'POST':
        form = <b>EditStamdataForm</b>(request.POST, instance=StamdataData)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect('backend/stamdata.html')
    else:
        print ('somethin goes wrong')
        form = <b>EditStamdataForm</b>(instance=StamdataData)
    return render(
        request,
        'backend/stamdata.html', 
        {'form':  form },
    )

一些额外的提示：

局部变量通常也写成蛇形，所以 stamdata_data 而不是 StamdataData;
您可以使用 redirect(..) [Django-doc]，并传递 视图的名称 以使 URL 分辨率更可靠；
在 Django 中，人们经常 而不是 对 URL 路径使用 .html 后缀；和
通常不会用 .values_list(..) 定义 queryset=…，这通常用于进行一些过滤。

Django EditStamdata() 得到了一个意外的关键字参数 'instance'

Django EditStamdata() got an unexpected keyword argument 'instance'

django

modelform