Question

当我尝试进入类别category1-test时我有例外： int（）的无效文字，基数为10：'category1-test' 我不明白这个例外的原因。

模型

class Category(models.Model):
    title = models.CharField(max_length=200)
    description = models.CharField(max_length=500)
    slug = models.SlugField(max_length=300, unique=True)

    def __str__(self):
        return '%s%s' % (self.title, self.description)

    class Meta:
        verbose_name_plural = 'Categories'

    @models.permalink
    def get_absolute_url(self):
       return ('category-detail', (), {'category_id': str(self.slug)})





class Info(models.Model):
    ...
    category = models.ForeignKey(Category)

    @models.permalink
    def get_absolute_url(self):
        return ('category_info', (), {'info_id': str(self.id)})

视图

def view_list(request, category_id):
    list = Info.objects.filter(category = category_id).order_by("-created")
    list = pagination(request, list, 10)
    category = get_object_or_404(Category, slug=category_id)
    return render_to_response('view_list.html', add_csrf(request, list=list, slug=category_id, category=category), context_instance=Reque
stContext(request))


Traceback:
File "/usr/local/lib/python3.2/dist-packages/django/core/handlers/base.py" in get_response
  114.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/usr/info/views.py" in view_list
  41.     list = Info.objects.filter(category = category_id).order_by("-created")
File "/usr/local/lib/python3.2/dist-packages/django/db/models/manager.py" in filter
  163.         return self.get_queryset().filter(*args, **kwargs)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/query.py" in filter
  590.         return self._filter_or_exclude(False, *args, **kwargs)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/query.py" in _filter_or_exclude
  608.             clone.query.add_q(Q(*args, **kwargs))
File "/usr/local/lib/python3.2/dist-packages/django/db/models/sql/query.py" in add_q
  1198.         clause = self._add_q(where_part, used_aliases)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/sql/query.py" in _add_q
  1232.                     current_negated=current_negated)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/sql/query.py" in build_filter
  1122.                                                      lookup_type, value)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/fields/related.py" in get_lookup_constraint
  1105.                      value[index]), AND)
File "/usr/local/lib/python3.2/dist-packages/django/utils/tree.py" in add
  104.         data = self._prepare_data(data)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/sql/where.py" in _prepare_data
  79.             value = obj.prepare(lookup_type, value)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/sql/where.py" in prepare
  352.             return self.field.get_prep_lookup(lookup_type, value)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/fields/__init__.py" in get_prep_lookup
  369.             return self.get_prep_value(value)
File "/usr/local/lib/python3.2/dist-packages/django/db/models/fields/__init__.py" in get_prep_value
  613.         return int(value)

异常类型：/ category1-test的ValueError 异常值：int（）的基数为10的无效文字：'category1-test'

Answer 1

category_id似乎是从网址中提取的字符串slug（例如“category1_test”），但您尝试将其用作外键（int）。你可以这样做：

lst = Info.objects.filter(category__slug=category_id).order_by("-created")

或者，重新安排：

category = get_object_or_404(Category, slug=category_id)
lst = Info.objects.filter(category=category).order_by("-created")

（注意：如果我是你，我不会分配名称“list”。你正在隐藏内置list！）

int（）的基数为10的异常无效文字的原因：

1 个答案: