Django引发ValueError：对于int（）无效的字面量，POST上的基数为10
Django始终将每个POST请求的ValueError到服务器。 从巡游各种形式和SE，这似乎是我的Django模型的一个问题。 然而，我不确定为什么模型会抛出这个错误，或者为什么他们会被Django调用，因为这是在POST事件中抛出的。
有问题的视图：
def channel(request, channel):
user_form = weblog_userForm(request.POST or None)
if request.method == 'POST' and user_form.is_valid():
nickname = user_form.cleaned_data['nickname']
message = user_form.cleaned_data['message']
password = user_form.cleaned_data['password']
postDetails = {}
... process request and eventually ...
return HttpResponse(json.dumps(postDetails), content_type="application/json")
我的应用模型：
class Line(models.Model):
message = models.TextField(blank=True, default="")
nick = models.CharField(max_length=50)
hostname = models.CharField(max_length=300)
channel = models.CharField(max_length=200)
timestamp = models.DateTimeField(auto_now_add=True)
LINE_TYPES = (
('PMSG', 'PRIVMSG'),
('SMSG', 'SOCKETMSG'),
('WMSG', 'WEBMSG'),
('NTCE', 'NOTICE'),
('ACTN', 'ACTION'),
('JOIN', 'JOIN'),
('PART', 'PART'),
('QUIT', 'QUIT'),
('NICK', 'NICK'),
('TPIC', 'TOPIC'),
)
msgType = models.CharField(max_length=4, choices=LINE_TYPES, default='PRIVMSG')
def __str__(self):
return self.message
class banned_ips(models.Model):
bannedIp = models.GenericIPAddressField()
追溯：
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/exception.py", line 35, in inner
response = get_response(request)
File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py", line 128, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py", line 126, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/django/weblogs/log/views.py", line 96, in channel
json_data = serializers.serialize("json", list(reversed(Line.objects.filter(id__gt=latest_line_id, channel=channel).order_by('-id')[:100])))
File "/usr/local/lib/python3.5/dist-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.5/dist-packages/django/db/models/query.py", line 836, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File "/usr/local/lib/python3.5/dist-packages/django/db/models/query.py", line 854, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "/usr/local/lib/python3.5/dist-packages/django/db/models/sql/query.py", line 1252, in add_q
clause, _ = self._add_q(q_object, self.used_aliases)
File "/usr/local/lib/python3.5/dist-packages/django/db/models/sql/query.py", line 1276, in _add_q
split_subq=split_subq,
File "/usr/local/lib/python3.5/dist-packages/django/db/models/sql/query.py", line 1214, in build_filter
condition = self.build_lookup(lookups, col, value)
File "/usr/local/lib/python3.5/dist-packages/django/db/models/sql/query.py", line 1084, in build_lookup
lookup = lookup_class(lhs, rhs)
File "/usr/local/lib/python3.5/dist-packages/django/db/models/lookups.py", line 18, in __init__
self.rhs = self.get_prep_lookup()
File "/usr/local/lib/python3.5/dist-packages/django/db/models/lookups.py", line 68, in get_prep_lookup
return self.lhs.output_field.get_prep_value(self.rhs)
File "/usr/local/lib/python3.5/dist-packages/django/db/models/fields/__init__.py", line 947, in get_prep_value
return int(value)
ValueError: invalid literal for int() with base 10: ''
任何帮助或想法，将不胜感激，真正抓住我的头。
吉列尔莫·查莫罗和口袋国王都在这里找到了我。 在我的views.py snip中发布的（看似无关的）逻辑块中，有以下代码：
if (request.is_ajax()):
latest_line_id = request.GET.get('latest_id', '')
if latest_line_id == '-1': # Return all lines
json_data = serializers.serialize("json", list(reversed(Line.objects.filter(channel=channel).order_by('-id')[:100])))
else:
json_data = serializers.serialize("json", list(reversed(Line.objects.filter(id__gt=latest_line_id, channel=channel).order_by('-id')[:100])))
return HttpResponse(json_data, content_type="application/json")
尽管逻辑上从来没有被调用过，但这两个响应者都是正确的， ValueError失败源于Django，然而却试图评估json_data 。
如果latest_line_id是空白的（就像在POST请求中那样），它将被设置为'' ，这将在尝试基于这个id的db查询时由Django触发ValueError 。 这可以通过尝试在Django shell中自己查询过滤器（通过使用$python manage.py shell ）来证明：
（注意：如果使用django shell，请不要忘记使用from <yourapp>.models import <yourModel> ）
>>> list(Line.objects.filter(channel="test").filter(id__lte='').order_by('id'))
Traceback (most recent call last):
...
ValueError: invalid literal for int() with base 10: ''
获得的经验教训，在编辑视图时要非常勤奋，并且记得仔细检查所有的逻辑块，并且在阅读回溯时多加小心（多一双眼睛可以提供帮助;) ）。 希望我的失察能够帮助别人节省我输的时间。
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