錯誤：當我使用django-smart-select時，'bool'對象沒有屬性'startswith'

Question

當我更改模型「位置」中的兩個字段時，我收到錯誤'bool'對象沒有屬性'startswith'。我試圖用Django的智能選擇（ChainedForeignKey）

from smart_selects.db_fields import ChainedForeignKey 
class ListOfContinents(models.Model): 

    id_Continent = models.AutoField(primary_key=True) 
    Continent = models.CharField(max_length=200,unique=True) 

    def __str__(self): 
     return '%s' % self.Continent 

class ListOfCountries(models.Model): 

    id_Country = models.AutoField(primary_key=True) 
    Continent = models.ForeignKey(
     ListOfContinents, default=0, to_field='Continent',db_column='Continent') 
    Country=models.CharField(max_length=200,unique=True) 

    def __str__(self): 
     return '%s' % self.Country 



class Location(models.Model): 

    #Continent=models.CharField(max_length=200,null=True, verbose_name='Континент') 
    #Country=models.CharField(max_length=200,null=True, verbose_name='Страна') 
    Continent=models.ForeignKey(
     ListOfContinents,to_field='Continent', 
     db_column='Continent',verbose_name='Континент',null=True) 
    Country = ChainedForeignKey(ListOfCountries,chained_field="Continent", 
     chained_model_field="Continent", 
     show_all=False, 
     auto_choose=True, 
     sort=True, 
     verbose_name='Страна', 
     db_column='Country', 
     to_field='Country', 
     null=True) 

Forms.py

class LocationForm (forms.ModelForm): 
    class Meta: 
     model = Location 
     fields = ('Continent','Country') 

    def __init__(self, *args, **kwargs): 
     self.helper = FormHelper() 
     self.helper.form_id = 'id-unitForm' 
     # self.helper.form_class = 'blueForms' 
     self.helper.form_class = 'form-horizontal' 
     self.helper.label_class = 'col-lg-1' 
     self.helper.field_class = 'col-lg-4' 
     self.helper.form_method = 'post' 
     # self.helper.form_action = 'submit_survey' 

     self.helper.add_input(Submit('submit', 'Submit', css_class='btn btn-primary')) 
     self.helper.add_input(Button('cancel', 'Cancel', css_class='btn-default', onclick="window.history.back()")) 

     super(LocationForm, self).__init__(*args, **kwargs) 

完整的錯誤文本： 'BOOL' 對象有沒有屬性 'startswith' 站點包\ crispy_forms \模板\ bootstrap3 \ uni_form.html，第4行 4行錯誤：

{% if include_media %} 
{{ form.media }} 
{% endif %} 

請幫我解決茨艾倫錯誤。 謝謝！

class Media(object): 
    def __init__(self, media=None, **kwargs): 
     if media: 
      media_attrs = media.__dict__ 
     else: 
      media_attrs = kwargs 

     self._css = {} 
     self._js = [] 

     for name in MEDIA_TYPES: 
      getattr(self, 'add_' + name)(media_attrs.get(name, None)) 

     # Any leftover attributes must be invalid. 
     # if media_attrs != {}: 
     #  raise TypeError("'class Media' has invalid attribute(s): %s" % ','.join(media_attrs.keys())) 

    def __str__(self): 
     return self.render() 

    def render(self): 
     return mark_safe('\n'.join(chain(*[getattr(self, 'render_' + name)() for name in MEDIA_TYPES]))) 

    def render_js(self): 
     return [format_html('<script type="text/javascript" src="{0}"></script>', self.absolute_path(path)) for path in self._js] 

    def render_css(self): 
     # To keep rendering order consistent, we can't just iterate over items(). 
     # We need to sort the keys, and iterate over the sorted list. 
     media = sorted(self._css.keys()) 
     return chain(*[ 
      [format_html('<link href="{0}" type="text/css" media="{1}" rel="stylesheet" />', self.absolute_path(path), medium) 
      for path in self._css[medium]] 
      for medium in media]) 

    def absolute_path(self, path, prefix=None): 
     if path.startswith(('http://', 'https://', '/')): 
      return path 
     if prefix is None: 
      if settings.STATIC_URL is None: 
       # backwards compatibility 
       prefix = settings.MEDIA_URL 
      else: 
       prefix = settings.STATIC_URL 
     return urljoin(prefix, path) 

    def __getitem__(self, name): 
     "Returns a Media object that only contains media of the given type" 
     if name in MEDIA_TYPES: 
      return Media(**{str(name): getattr(self, '_' + name)}) 
     raise KeyError('Unknown media type "%s"' % name) 

    def add_js(self, data): 
     if data: 
      for path in data: 
       if path not in self._js: 
        self._js.append(path) 

    def add_css(self, data): 
     if data: 
      for medium, paths in data.items(): 
       for path in paths: 
        if not self._css.get(medium) or path not in self._css[medium]: 
         self._css.setdefault(medium, []).append(path) 

    def __add__(self, other): 
     combined = Media() 
     for name in MEDIA_TYPES: 
      getattr(combined, 'add_' + name)(getattr(self, '_' + name, None)) 
      getattr(combined, 'add_' + name)(getattr(other, '_' + name, None)) 
     return combined 

Answer 1

在您的形式初始化打錯的電話超，需要更換CaseForm上LocationForm，但我認爲錯誤一些地方在類媒體，請給它

class LocationForm (forms.ModelForm): 
    # . . . 
    super(LocationForm, self).__init__(*args, **kwargs)