Django：ValueError：解压缩的值太多了

Question

我收到了一个ValueError，我无法想象我的生活中的错误。我知道错误意味着传递给变量的值多于预期值（即(x, y) = 1, 2, 3），但我不明白为什么这是一个问题。

这是错误的位置（在views.py文件中）：

## image_pks is just a list of ImageItem primary keys (eg, [1, 2] or [5])
queryset = ImageItem.objects.filter(pk__in=image_pks)
ImageInfoFormset = modelformset_factory(ImageItem, fields=('title', 'caption'), extra=0)
formset = ImageInfoFormset(queryset) ## Error happening here!!!

这就是ImageItem模型的样子：

class ImageItem(models.Model):
    user = models.ForeignKey(User)
    upload_date = models.DateTimeField(auto_now_add=True)
    last_modified = models.DateTimeField(auto_now=True)
    library = models.ForeignKey(Library)
    img_big = models.ImageField(upload_to=img_get_file_path)
    img_363 = models.ImageField(upload_to=img_get_file_path)
    title = models.CharField(max_length=50,
                             blank=True)
    caption = models.CharField(max_length=1000,
                               blank=True)

这是关于追溯的信息：

以下是回溯中的局部变量：

如果你们需要更多信息，请告诉我们，谢谢！

编辑：这是提供的整个追溯：

Traceback:
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Users/sgarza62/riotry_master/riotry/backboard_general/views.py" in Backboard_Home
  44.                 formset = ImageInfoFormset(queryset) # TOO MANY VALUES ERROR HERE!
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/models.py" in __init__
  424.         super(BaseModelFormSet, self).__init__(**defaults)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/formsets.py" in __init__
  50.         self._construct_forms()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/formsets.py" in _construct_forms
  114.         for i in xrange(self.total_form_count()):
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/formsets.py" in total_form_count
  88.             return self.management_form.cleaned_data[TOTAL_FORM_COUNT]
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/formsets.py" in _management_form
  74.             if not form.is_valid():
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py" in is_valid
  124.         return self.is_bound and not bool(self.errors)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py" in _get_errors
  115.             self.full_clean()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py" in full_clean
  270.         self._clean_fields()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py" in _clean_fields
  281.             value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/widgets.py" in value_from_datadict
  205.         return data.get(name, None)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/query.py" in get
  358.         clone = self.filter(*args, **kwargs)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/query.py" in filter
  624.         return self._filter_or_exclude(False, *args, **kwargs)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/query.py" in _filter_or_exclude
  642.             clone.query.add_q(Q(*args, **kwargs))
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/sql/query.py" in add_q
  1250.                             can_reuse=used_aliases, force_having=force_having)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/sql/query.py" in add_filter
  1056.         arg, value = filter_expr

Exception Type: ValueError at /backboard/
Exception Value: too many values to unpack

编辑2 ： 我正在玩它，并且发生了一些奇怪的事情。当我将行queryset = ImageItem.objects.filter(pk__in=image_pks)更改为queryset = ImageItem.objects.get(pk=10)（其中10是任意ID）时，我收到以下错误：AttributeError: 'ImageItem' object has no attribute 'get'，而原来有问题的行正在抛出错误！

这是一个奇怪的错误，因为ImageItem只是一个普通的模型。当然它有属性'get'。这是否与查询集首先在有问题的行（formset = ImageInfoFormset(queryset)）上进行评估这一事实有关？在写入查询之后，在评估之前，ImageItem是否被分配给其他东西？

Answer 1

尝试删除queryset=定义（第一行），然后执行以下操作：

ImageInfoFormset = modelformset_factory(ImageItem, fields=('title', 'caption'), extra=0)
formset = ImageInfoFormset(queryset=ImageItem.objects.filter(pk__in=image_pks))

您必须明确定义您正在更改查询集，否则您只是将另一个变量传递给formset。

查看文档here.

Answer 2

我会尝试`formset = ImageInfoFormset（queryset.values（））

formset = ImageInfoFormset(queryset.values())

而不是

formset = ImageInfoFormset(queryset)