Django AttributeError:表单对象没有属性'_errors' [英] Django AttributeError: Form object has no attribute '_errors'
问题描述
我正在重写表单中的init方法,现在返回错误'TransactionForm'对象没有属性'_errors'.
I'm overriding the init method in my form andthis is now returning an error 'TransactionForm' object has no attribute '_errors'.
我希望它能起作用,因为我在 init 中包含了super,但是也许我不知道如何正确使用它.一个解释将不胜感激.我需要怎么做才能使form.errors工作?
I would expect this to work because I've included super in my init, however perhaps I don't understand how to use this correctly. An explanation would be appreciated. What do I need to do to get form.errors working?
完整追溯
跟踪:
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ core \ handlers \ exception.py"中内35. response = get_response(request)
File "C:\Program Files\Python36\lib\site-packages\django\core\handlers\exception.py" in inner 35. response = get_response(request)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ core \ handlers \ base.py"中_get_response128. response = self.process_exception_by_middleware(e,request)
File "C:\Program Files\Python36\lib\site-packages\django\core\handlers\base.py" in _get_response 128. response = self.process_exception_by_middleware(e, request)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ core \ handlers \ base.py"中_get_response126. response = wrapd_callback(request,* callback_args,** callback_kwargs)
File "C:\Program Files\Python36\lib\site-packages\django\core\handlers\base.py" in _get_response 126. response = wrapped_callback(request, *callback_args, **callback_kwargs)
add_transaction中的文件"C:\ py \ portfolio-project \ myportfolio \ views.py"136. return render(request,'myportfolio/add_transaction.html',{'form':form})
File "C:\py\portfolio-project\myportfolio\views.py" in add_transaction 136. return render(request, 'myportfolio/add_transaction.html', {'form': form})
文件"C:\ Program Files \ Python36 \ lib \ site-packages \ django \ shortcuts.py"在渲染36. content = loader.render_to_string(模板名称,上下文,请求,使用=使用)
File "C:\Program Files\Python36\lib\site-packages\django\shortcuts.py" in render 36. content = loader.render_to_string(template_name, context, request, using=using)
文件"C:\ Program文件\ Python36 \ lib \ site-packages \ django \ template \ loader.py"中render_to_string62. return template.render(context,request)
File "C:\Program Files\Python36\lib\site-packages\django\template\loader.py" in render_to_string 62. return template.render(context, request)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ template \ backends \ django.py在渲染61.返回self.template.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\backends\django.py" in render 61. return self.template.render(context)
文件"C:\ Program渲染中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"175. return self._render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render 175. return self._render(context)
文件"C:\ Program_render中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"167. return self.nodelist.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in _render 167. return self.nodelist.render(context)
文件"C:\ Program渲染中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"943.位= node.render_annotated(上下文)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render 943. bit = node.render_annotated(context)
文件"C:\ Program文件\ Python36 \ lib \ site-packages \ django \ template \ base.py"中render_annotated910. return self.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render_annotated 910. return self.render(context)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ template \ loader_tags.py使成为155. return created_parent._render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\loader_tags.py" in render 155. return compiled_parent._render(context)
文件"C:\ Program_render中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"167. return self.nodelist.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in _render 167. return self.nodelist.render(context)
文件"C:\ Program渲染中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"943.位= node.render_annotated(上下文)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render 943. bit = node.render_annotated(context)
文件"C:\ Program文件\ Python36 \ lib \ site-packages \ django \ template \ base.py"中render_annotated910. return self.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render_annotated 910. return self.render(context)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ template \ loader_tags.py使成为155. return created_parent._render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\loader_tags.py" in render 155. return compiled_parent._render(context)
文件"C:\ Program_render中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"167. return self.nodelist.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in _render 167. return self.nodelist.render(context)
文件"C:\ Program渲染中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"943.位= node.render_annotated(上下文)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render 943. bit = node.render_annotated(context)
文件"C:\ Program文件\ Python36 \ lib \ site-packages \ django \ template \ base.py"中render_annotated910. return self.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render_annotated 910. return self.render(context)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ template \ loader_tags.py使成为67. result = block.nodelist.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\loader_tags.py" in render 67. result = block.nodelist.render(context)
文件"C:\ Program渲染中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"943.位= node.render_annotated(上下文)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render 943. bit = node.render_annotated(context)
文件"C:\ Program文件\ Python36 \ lib \ site-packages \ django \ template \ base.py"中render_annotated910. return self.render(context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render_annotated 910. return self.render(context)
文件"C:\ Program渲染中的"Files \ Python36 \ lib \ site-packages \ django \ template \ base.py"999. return render_value_in_context(output,context)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render 999. return render_value_in_context(output, context)
文件"C:\ Program文件\ Python36 \ lib \ site-packages \ django \ template \ base.py"中render_value_in_context978. value = str(value)
File "C:\Program Files\Python36\lib\site-packages\django\template\base.py" in render_value_in_context 978. value = str(value)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ utils \ html.py371. klass. str = lambda self:mark_safe(klass_str(self))
File "C:\Program Files\Python36\lib\site-packages\django\utils\html.py" in 371. klass.str = lambda self: mark_safe(klass_str(self))
文件"C:\ Program str 中的Files \ Python36 \ lib \ site-packages \ django \ forms \ forms.py"136. return self.as_table()
File "C:\Program Files\Python36\lib\site-packages\django\forms\forms.py" in str 136. return self.as_table()
文件"C:\ Programas_table中的Files \ Python36 \ lib \ site-packages \ django \ forms \ forms.py279. errors_on_separate_row = False)
File "C:\Program Files\Python36\lib\site-packages\django\forms\forms.py" in as_table 279. errors_on_separate_row=False)
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ forms \ forms.py"中_html_output196. top_errors = self.non_field_errors()#应该显示在所有字段上方的错误.
File "C:\Program Files\Python36\lib\site-packages\django\forms\forms.py" in _html_output 196. top_errors = self.non_field_errors() # Errors that should be displayed above all fields.
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ forms \ forms.py"中non_field_errors305. return self.errors.get(NON_FIELD_ERRORS,self.error_class(error_class ='nonfield'))
File "C:\Program Files\Python36\lib\site-packages\django\forms\forms.py" in non_field_errors 305. return self.errors.get(NON_FIELD_ERRORS, self.error_class(error_class='nonfield'))
文件"C:\ ProgramFiles \ Python36 \ lib \ site-packages \ django \ forms \ forms.py错误173.如果self._errors为None:
File "C:\Program Files\Python36\lib\site-packages\django\forms\forms.py" in errors 173. if self._errors is None:
异常类型:/myportfolio/add_transaction/中的AttributeError异常值:"TransactionForm"对象没有属性"_errors"
Exception Type: AttributeError at /myportfolio/add_transaction/ Exception Value: 'TransactionForm' object has no attribute '_errors'
表格
class TransactionForm(forms.ModelForm):
CHOICES = ((1, 'Buy'), (2, 'Sell'),)
coin = forms.ModelChoiceField(queryset = Coin.objects.all())
buysell = forms.ChoiceField(choices = CHOICES)
field_order = ['buysell', 'coin', 'amount', 'trade_price']
class Meta:
model = Transactions
fields = {'buysell', 'coin', 'amount', 'trade_price'}
def __init__(self, coin_price = None, user = None, *args, **kwargs):
if user:
self.user = user
qs_coin = Portfolio.objects.filter(user = self.user).values('coin').distinct()
super(TransactionForm, self).__init__(self.user, *args, **kwargs)
self.fields['coin'].queryset = qs_coin
if coin_price:
self.coin_price = coin_price
super(TransactionForm, self).__init__(self.user, self.coin_price, *args, **kwargs)
self.fields['price'] = self.coin_price
观看次数
def add_transaction(request):
print(request.method)
print("test1")
print(request.GET)
if request.method == "GET":
if request.is_ajax():
print("ajax test")
data = {
'test': "test1"
}
form = TransactionForm(request.GET, user = request.user, coin_price = GetCoin("Bitcoin").price)
return JsonResponse(data)
form = TransactionForm()
if request.method == "POST":
print("test2")
form = TransactionForm(request.POST)
if form.is_valid():
print("test3")
obj = form.save(commit = False)
obj.user = request.user
obj.save()
return HttpResponseRedirect('/myportfolio/')
else:
print(form.errors)
return render(request, 'myportfolio/add_transaction.html', {'form': form})
推荐答案
如果未提供 coin_price
和 user
,则不会调用Form的超类 __ init __
方法.这就是为什么未创建诸如 _errors
之类的表单属性的原因.您需要像这样重写表单的 __ init __
:
Form's superclass __init__
method not called if coin_price
and user
not provided. That's why such form's attributes as _errors
was not created. You need to rewrite form's __init__
like this:
def __init__(self, coin_price = None, user = None, *args, **kwargs):
super(TransactionForm, self).__init__(*args, **kwargs)
if user:
self.user = user
qs_coin = Portfolio.objects.filter(user = self.user).values('coin').distinct()
self.fields['coin'].queryset = qs_coin
if coin_price:
self.coin_price = coin_price
self.fields['price'] = self.coin_price
在任何情况下都使 super .__ init __()
调用.
To make super.__init__()
called in any cases.
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