django-reversion 不适用于 MultipleChoiceField？答案

【问题标题】：django-reversion didnt work with MultipleChoiceField?django-reversion 不适用于 MultipleChoiceField？
【发布时间】：2017-09-23 11:12:33
【问题描述】：

我有 MultipleChoiceField 的表单。它显示了来自元组 CHOICES 的数据。用户选择复选框，然后我使用所选数据在视图内创建新对象（在我的情况下是要求）。当我尝试在我的视图中使用 django-reversion 时，它会引发错误。你知道为什么reversion.set_user(request.user) 和reversion.set_comment('CREATE') 不起作用吗？

models.py：

@reversion.register()
class Requirement(models.Model):
    code = models.UUIDField(_('Code'), primary_key=True, default=uuid.uuid4, editable=False)
    symbol = models.CharField(_('Symbol'), max_length=250)
    name = models.CharField(_('Name'), max_length=250)

forms.py：

CHOICES = (
        ('A', 'Name A'),
        ('B', 'Name B'),
        ('C', 'Name C'),
)

class RequirementAddForm(forms.ModelForm):
    symbol = forms.MultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple, choices=CHOICES,)

    class Meta:
        model = Requirement
        fields = ('symbol',)

view.py：

@reversion.create_revision()
def _requirement_add(request):
    if request.method == 'POST':
        form = RequirementAddForm(request.POST)
        if form.is_valid():
            group_requirement_list = dict(CHOICES)     # {'C': 'Name C', 'A': 'Name A', 'B': 'Name B'}
            symbols = form.cleaned_data.get('symbol')  # Selected values: ['A', 'B', 'C']
            group_requirement = list_group_requirement_form.save(commit=False)
            for symbol in symbols:
                group_requirement.project = project
                group_requirement.symbol = symbol
                group_requirement.name = group_requirement_list[symbol]
                group_requirement.pk = None
                group_requirement.save()
                reversion.set_user(request.user)  # ???
                reversion.set_comment('CREATE')   # ???

错误：

Traceback (most recent call last):
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\exception.py", line 39, in inner
    response = get_response(request)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\reversion\revisions.py", line 296, in do_revision_context
    return func(*args, **kwargs)
  File "C:\Users\Nurzhan\PycharmProjects\RMS\project\views.py", line 603, in requirement_add
    requirement.save()
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 796, in save
    force_update=force_update, update_fields=update_fields)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 833, in save_base
    update_fields=update_fields, raw=raw, using=using)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\dispatch\dispatcher.py", line 191, in send
    response = receiver(signal=self, sender=sender, **named)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\reversion\revisions.py", line 302, in _post_save_receiver
    add_to_revision(instance, model_db=using)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\reversion\revisions.py", line 212, in add_to_revision
    _add_to_revision(obj, db, model_db, True)
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\reversion\revisions.py", line 193, in _add_to_revision
    object_repr=force_text(obj),
  File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\utils\encoding.py", line 76, in force_text
    s = six.text_type(s)
TypeError: __str__ returned non-string (type __proxy__)
[26/Apr/2017 13:17:43] "POST /ru/account/dashboard/projects/cdecbd12-80d3-4ecd-9c08-8edef5d7f850/requirement_add/ HTTP/1.1" 500 18847

【问题讨论】：

标签： python django python-3.x django-1.10 django-reversion

【解决方案1】：

终于，我找到了问题所在。在我的模态中，我使用：

def __str__(self):
   return self.name

删除后 django-reversion 工作正常！

【讨论】：

如果您不想完全删除它，可以尝试将其更改为return str(self.name)。