Django: UnboundLocalError: local variable 'company' referenced before assignment

Question

我试图通过在其中传递两个主键来在我的详细信息视图中创建一个 url 字段...

这是我在 urls.py 中所做的：

    url(r'^company/(?P<pk1>\d+)/groupdetail/(?P<pk2>\d+)/$',views.group1DetailView.as_view(),name='groupdetail'),

在我看来：

    def get_object(self):
        pk1 = self.kwargs['pk1']
        pk2 = self.kwargs['pk2']
        company = get_object_or_404(company, pk=pk1)
        group1 = get_object_or_404(group1, pk=pk2)
        return group1

我在这一行中遇到错误：

company = get_object_or_404(company, pk=pk1)

在我的 group1 列表视图中，我这样做了：

<a href="{% url 'accounting_double_entry:groupdetail' pk1=company_details.pk pk2=group1_details.pk %}">{{group1.group_Name}}</a>

谁能告诉我我在这段代码中做错了什么？

谢谢

Answer 1

在你的函数中，你将赋给一个名为company的变量，所以Python认为company是一个局部变量，但是在那一刻未分配，所以你需要使用另一个变量名来避免这种情况：

def get_object(self):
    pk1 = self.kwargs['pk1']
    pk2 = self.kwargs['pk2']
    # make sure the variable name is different than the model name
    <b>company_obj</b> = get_object_or_404(<b>company</b>, pk=pk1)
    group1_obj = get_object_or_404(group1, pk=pk2)
    return group1_obj

既然你在这里没有使用 company_obj，你可能想要删除变量名：

def get_object(self):
    pk1 = self.kwargs['pk1']
    pk2 = self.kwargs['pk2']
    get_object_or_404(company, pk=pk1)
    group1_obj = get_object_or_404(group1, pk=pk2)
    return group1_obj

作为替代方案，如果您的 group1 与 company“相关”，并且您想检查是否成立，那么过滤该公司是有意义的：

def get_object(self):
    pk1 = self.kwargs['pk1']
    pk2 = self.kwargs['pk2']
    <b>company_obj</b> = get_object_or_404(company, pk=pk1)
    group1_obj = get_object_or_404(group1, pk=pk2<b>, company=company_obj</b>)
    return group1_obj

Note: PEP-8 [Python-doc] advices class names to be written in CamelCase, whereas fields and local variables are written in lower_case. It is not uncommon to see something like some_class = SomeClass(), so because the camel case starts with an uppercase, clashes between local variables and classes, will never exist.

Django: UnboundLocalError: local variable 'company' referenced before assignment

Django: UnboundLocalError: local variable 'company' referenced before assignment

django

django-templates

django-views

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