Question

我正在尝试在django模型对象中保存ManyToMany字段值。但是当我保存错误时，带有基数10的int（）的文字无效。我的代码是

def saveDetail(request):

    userExp = str(request.GET.get('user'))
    tags = request.POST.getlist('tags')
    comment = request.POST.get('comment')
    exp = customer.objects.get(user = userExp)   
    exp.tags = tags
    exp.save()

，错误是

ValueError: invalid literal for int() with base 10: 'tag2

我的tagExp模型是

class TagsExp(models.Model):


    label=models.CharField(max_length=50,null=True, blank=True)


    def __unicode__(self):
        return str(self.label)

我的客户模式是

class Customer(models.Model):

    user = models.OneToOneField(User)    remark = models.TextField(null=True, blank=True)
    tags = models.ManyToManyField(TagsExp, null=True, blank=True)
    time = models.DateField(null=True)

我在下面添加了我的错误追溯。

回溯：

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  149.                     response = self.process_exception_by_middleware(e, request)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/channels/handler.py" in process_exception_by_middleware
  227.             return super(AsgiHandler, self).process_exception_by_middleware(exception, request)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
  23.                 return view_func(request, *args, **kwargs)

File "/home/cp/Documents/projects/beta/upKonnect/decorators.py" in wrapped
  12.             return view_func(request, *args, **kwargs)

File "/home/cp/Documents/projects/beta/adminProfile/views.py" in saveExpDetail
  506.     exp.tags = tags

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/related_descriptors.py" in __set__
  481.         manager.set(value)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/related_descriptors.py" in set
  910.                     self.add(*new_objs)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/related_descriptors.py" in add
  843.                 self._add_items(self.source_field_name, self.target_field_name, *objs)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/related_descriptors.py" in _add_items
  986.                             '%s__in' % target_field_name: new_ids,

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/query.py" in filter
  790.         return self._filter_or_exclude(False, *args, **kwargs)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/query.py" in _filter_or_exclude
  808.             clone.query.add_q(Q(*args, **kwargs))

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/sql/query.py" in add_q
  1243.         clause, _ = self._add_q(q_object, self.used_aliases)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/sql/query.py" in _add_q
  1269.                     allow_joins=allow_joins, split_subq=split_subq,

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/sql/query.py" in build_filter
  1199.             condition = lookup_class(lhs, value)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/lookups.py" in __init__
  19.         self.rhs = self.get_prep_lookup()

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/related_lookups.py" in get_prep_lookup
  54.                     self.lookup_name, self.rhs)

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py" in get_prep_lookup
  746.             return [self.get_prep_value(v) for v in value]

File "/home/cp/Documents/beta/envBeta/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py" in get_prep_value
  976.         return int(value)

Exception Type: ValueError at /upadmin/save-Exp-Detail/
Exception Value: invalid literal for int() with base 10: 'tag2 '

Answer 1

tags是ManyToMany字段。您不能使用直接分配到列表项来更新字段。您应该通过与列表中的项目对应的字段add方法标记对象进行分配。

假设您TagsExp的字段label与列表中的项目相对应，您可以执行以下操作：

for tag_label in tags:
    tag_label = tag_label.strip().lower() # clean up tag
    tag, _ = TagsExp.objects.get_or_create(label=tag_label)
    exp.tags.add(tag)
exp.save()

另一方面，traceback中的标记有一个尾随空格。如果没有清理而不是获取现有标签，那将创建一个新标签。此外，默认情况下不会处理多个案例。我认为您应该查看django-taggit应用标记，它具有管理空白字符和不同案例的强大功能。

在django中保存ManyToMany Field值时，错误发生int（）的基数为10的无效文字

1 个答案: