Django站点，获取错误__init __（）缺少1个必需的位置参数：调用视图时“请求”

Question

我在尝试加载edit_transaction视图时收到上面的错误消息。我知道错误意味着什么，但不明白它为什么会发生，因为它以前工作，仍然可以在另一个类似的页面上工作。如果需要可以提供更多代码，我想知道如果这里有一些令人眼花缭乱的东西，那么我就看不到它。

完整追溯：

  

回溯：

     

内部文件“/Users/c/.virtualenvs/django-budget/lib/python3.5/site->packages/django/core/handlers/exception.py”    42. response = get_response（request）

     _get_response中的

文件“/Users/c/.virtualenvs/django-budget/lib/python3.5/site->packages/django/core/handlers/base.py”    187. response = self.process_exception_by_middleware（e，request）

     _get_response中的

文件“/Users/c/.virtualenvs/django-budget/lib/python3.5/site-packages/django/core/handlers/base.py”     185. response = wrapped_callback（request，* callback_args，** callback_kwargs）

     _wrapped_view中的

文件“/Users/c/.virtualenvs/django-budget/lib/python3.5/site-packages/django/contrib/auth/decorators.py”     23. return view_func（request，* args，** kwargs）

     

edit_transaction中的文件“/Users/c/sites/budget/budget/views.py”     83. form = TransactionForm（instance = transaction）

     

异常类型：/ budget / transaction / 3 / edit /中的TypeError   异常值： init （）缺少1个必需的位置参数：'request'

从urls.py中提取：

url(r'^transaction/(?P<pk>[0-9]+)/edit/$', views.edit_transaction, name='edit_transaction'),

从views.py中提取：

@login_required
def edit_transaction(request, pk):
    transaction = get_object_or_404(Transaction, pk=pk)
    if request.method == "POST":
        form = TransactionForm(request.POST, instance=transaction)
        if form.is_valid():
            transaction = form.save(commit=False)
            transaction.updated = timezone.now()
            transaction.save()
            return redirect('view_transaction_detail', pk=transaction.pk)
    else:
        form = TransactionForm(instance=transaction)
    return render(request, 'budget/new_transaction.html', {'form': form})

模板提取：

{% extends 'budget/base.html' %}

{% block content %}

    <h2>{{ transaction.title }}</h2>
    <h4>{{ transaction.date }}</h4>
    <h4>Transaction type: {{ transaction.transaction_type }}</h4>
    <h4>Category: {{ transaction.category }}</h4>
    <h4>Budgeted amount: {{ transaction.budgeted_amount }}</h4>
    <h4>Actual amount: {{ transaction.actual_amount }}</h4>
    <h4>Difference: {{ difference }}</h4>
    <h4>Comments: {{ transaction.comments }}</h4>

    <a class="btn btn-default" href="{% url 'edit_transaction' pk=transaction.pk %}"><span class="glyphicon glyphicon-pencil"></span></a>
    <a class="btn btn-default" href="{% url 'delete_transaction' pk=transaction.pk %}"><span class="glyphicon glyphicon-remove"></span></a>
    <h5><a href="{% url 'summary' %}">Back to summary</a></h5>

{% endblock %}

编辑添加TranscationForm代码

class TransactionForm(forms.ModelForm):

    class Meta:
        model = Transaction
        fields = ('title', 'transaction_type', 'category', 'budgeted_amount', 'actual_amount', 'date', 'comments',)

    #new_category field to allow you to add a new category
    new_category = forms.CharField(max_length=30, required=False, label="New Category Title")

    def __init__(self, request, *args, **kwargs):
        super(TransactionForm, self).__init__(*args, **kwargs)
        #category is now not a required field because you will use category OR new_category
        self.fields['category'].required=False
        #set to allow use of self.request.user to set user for category
        self.request = request

    def clean(self):
        category = self.cleaned_data.get('category')
        new_category = self.cleaned_data.get('new_category')
        if not category and not new_category:
            # raise an error if neither a category is selected nor a new category is entered
            raise forms.ValidationError('Category or New category field is required')
        elif not category:
            # create category from new_category
            category, created = Category.objects.get_or_create(title=new_category, defaults={'user': self.request.user})
            self.cleaned_data['category'] = category

        return super(TransactionForm, self).clean()

Answer 1

似乎你应该写：

form = TransactionForm(request=request, instance=transaction)

而不是：

form = TransactionForm(request.POST, instance=transaction)