「海峽」對象有沒有屬性「得到」

Question

我試圖通過overiding的初始化 中的ModelForm設置字段的選擇，但我得到這個錯誤

'str' object has no attribute 'get' 

forms.py

class carOwnerForm(forms.ModelForm): 
first_name = forms.charfield() 
last_name = forms.charfield() 

def __init__(self, a,b,c): 
    super(carOwnerForm,self).__init(a,b,c) 
    self.fields['ownership_Type'].choices = [(a,'c'),(b,'b'),(c,'x')] 

class Meta: 
    model = CarOwner 
    fields = ['ownership_type','CarModel'] 

視圖

def CarOwnerSearch(request): 
if request.user.is_authenticated(): 
    form = carOwnerForm('B','None','C') 
    return render (request,'carmanager/CarOwnerSearch.html', {'form': form}) 

誤差在html

Request Method:  GET 
Request URL: http://127.0.0.1:8000/parcelmanager/CrownLandsSearch/ 
Django Version:  1.8 
Exception Type:  AttributeError 
Exception Value:  

'list' object has no attribute 'get' 

Exception Location:  C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\widgets.py in value_from_datadict, line 223 





     Traceback: 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\core\handlers\base.py" in get_response 
    132.      response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "C:\Sites\laisy\carmanager\views.py" in CrownLandsSearch 
    811.   return render (request,'carmanager/CrownLandsSearch.html', {'form': form}) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\shortcuts.py" in render 
    67.    template_name, context, request=request, using=using) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\loader.py" in render_to_string 
    99.   return template.render(context, request) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\backends\django.py" in render 
    74.   return self.template.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in render 
    209.      return self._render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in _render 
    201.   return self.nodelist.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in render 
    903.     bit = self.render_node(node, context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\debug.py" in render_node 
    79.    return node.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\loader_tags.py" in render 
    135.   return compiled_parent._render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in _render 
    201.   return self.nodelist.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in render 
    903.     bit = self.render_node(node, context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\debug.py" in render_node 
    79.    return node.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\loader_tags.py" in render 
    65.     result = block.nodelist.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in render 
    903.     bit = self.render_node(node, context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\debug.py" in render_node 
    79.    return node.render(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\debug.py" in render 
    89.    output = self.filter_expression.resolve(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in resolve 
    647.     obj = self.var.resolve(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in resolve 
    787.    value = self._resolve_lookup(context) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\template\base.py" in _resolve_lookup 
    847.        current = current() 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\forms.py" in as_p 
    302.    errors_on_separate_row=True) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\forms.py" in _html_output 
    203.   top_errors = self.non_field_errors() # Errors that should be displayed above all fields. 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\forms.py" in non_field_errors 
    310.   return self.errors.get(NON_FIELD_ERRORS, self.error_class(error_class='nonfield')) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\forms.py" in errors 
    176.    self.full_clean() 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\forms.py" in full_clean 
    392.   self._clean_fields() 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\forms.py" in _clean_fields 
    401.    value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name)) 
File "C:\Users\yfevrier\Envs\landregtry1\lib\site-packages\django\forms\widgets.py" in value_from_datadict 
    223.   return data.get(name, None) 

Exception Type: AttributeError at /parcelmanager/carOwnerSearch/ 
Exception Value: 'str' object has no attribute 'get' 

Answer 1

你會做它來解決這個問題...

您form.py

class CarOwnerForm(forms.ModelForm): 
    first_name = forms.charfield() 
    last_name = forms.charfield() 

    class Meta: 
     model = CarOwner 
     fields = ['ownership_type','CarModel'] 

    def __init__(self, *args, **kwargs): 
     _choices_list = kwargs.pop('_choices', None) 
     super(CarOwnerForm, self).__init__(*args, **kwargs) 
     if _choices_list is not None: 
      # this only works if 'ownership_type' is a CharField... and it will be your error 
      self.fields['ownership_type'].choice = _choices_list # I don't remeber if the attribute is 'choice' or 'choices' 
      # if 'ownership_type' is a RelationField, you must set queryset and not a list of strings 

，並在您views.py

... 
def car_owner_search(request): 
    """Doctype for view""" 
    if request.user.is_authenticated(): 
     _CHOICE_LIST = ['B', 'None', 'C'] 
     if request.method == 'POST': 
      form = CarOwnerForm(data=request.POST, _choices=_CHOICE_LIST) 

      if form.is_valid(): 
       your_model = form.save(commit=False) 
       your_model.first_name = form.cleaned_data['first_name'] 
       your_model.save() 
     else: 
      form = CarOwnerForm(_choices=_CHOICE_LIST) 
     return render (request,'carmanager/CarOwnerSearch.html', {'form': form}) 
    return HttpRedirect('/login/') # or other HttpResponse 

Answer 2

這裏確實有不少錯誤。

首先，模型預期某個接口。他們接受POST，任何初始數據和模型實例。但是你忽略了這一點，所以他們只接受a, b, c，不管那是什麼;你不僅摧毀了課堂做它需要做的事情的能力，你還將這些論據傳遞給不期望它們的超類。

其次，你需要更加關心你的屬性。表單沒有field屬性，它們有fields;選擇字段不具有choice屬性，它具有choices;並且選擇需要是可迭代的迭代器，用於ID和顯示值，而不是單個迭代器。