Django-filter: [2.1.0] BaseCSVWidget.value_from_datadict — AttributeError: 'list' 对象没有属性 'split'

嗨@moseb。 您可以粘贴您正在使用的 FilterSet 代码吗？ 回溯的最后几行足以确定您遇到此异常的原因。

完整追溯：

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/wsgiref/handlers.py", line 137, in run
    self.result = application(self.environ, self.start_response)
  File "/usr/local/lib/python3.7/site-packages/django/contrib/staticfiles/handlers.py", line 65, in __call__
    return self.application(environ, start_response)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/wsgi.py", line 141, in __call__
    response = self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 75, in get_response
    response = self._middleware_chain(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django_global_request/middleware.py", line 15, in __call__
    return self.get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 145, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 143, in _get_response
    response = response.render()
  File "/usr/local/lib/python3.7/site-packages/django/template/response.py", line 106, in render
    self.content = self.rendered_content
  File "/usr/local/lib/python3.7/site-packages/rest_framework/response.py", line 72, in rendered_content
    ret = renderer.render(self.data, accepted_media_type, context)
  File "/usr/local/lib/python3.7/site-packages/rest_framework/renderers.py", line 733, in render
    context = self.get_context(data, accepted_media_type, renderer_context)
  File "/usr/local/lib/python3.7/site-packages/rest_framework/renderers.py", line 710, in get_context
    'filter_form': self.get_filter_form(data, view, request),
  File "/usr/local/lib/python3.7/site-packages/rest_framework/renderers.py", line 642, in get_filter_form
    html = backend().to_html(request, queryset, view)
  File "/usr/local/lib/python3.7/site-packages/rest_framework_filters/backends.py", line 52, in to_html
    return super().to_html(request, queryset, view)
  File "/usr/local/lib/python3.7/site-packages/django_filters/rest_framework/backends.py", line 105, in to_html
    return template.render(context, request)
  File "/usr/local/lib/python3.7/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 171, in render
    return self._render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/templatetags/crispy_forms_tags.py", line 199, in render
    c = self.get_render(context).flatten()
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/templatetags/crispy_forms_tags.py", line 118, in get_render
    actual_form.form_html = helper.render_layout(actual_form, node_context, template_pack=self.template_pack)
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/helper.py", line 308, in render_layout
    template_pack=template_pack
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/layout.py", line 140, in render
    return self.get_rendered_fields(form, form_style, context, template_pack, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/layout.py", line 104, in get_rendered_fields
    for field in self.fields
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/layout.py", line 104, in <genexpr>
    for field in self.fields
  File "/usr/local/lib/python3.7/site-packages/crispy_forms/utils.py", line 148, in render_field
    html = template.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 171, in render
    return self._render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
    return self.nodelist.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/defaulttags.py", line 309, in render
    return nodelist.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/defaulttags.py", line 309, in render
    return nodelist.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 937, in render
    bit = node.render_annotated(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 904, in render_annotated
    return self.render(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/defaulttags.py", line 302, in render
    match = condition.eval(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/defaulttags.py", line 876, in eval
    return self.value.resolve(context, ignore_failures=True)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "/usr/local/lib/python3.7/site-packages/django/template/base.py", line 837, in _resolve_lookup
    current = getattr(current, bit)
  File "/usr/local/lib/python3.7/site-packages/django/forms/boundfield.py", line 74, in errors
    return self.form.errors.get(self.name, self.form.error_class())
  File "/usr/local/lib/python3.7/site-packages/django/forms/forms.py", line 180, in errors
    self.full_clean()
  File "/usr/local/lib/python3.7/site-packages/django/forms/forms.py", line 381, in full_clean
    self._clean_fields()
  File "/usr/local/lib/python3.7/site-packages/django/forms/forms.py", line 393, in _clean_fields
    value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
  File "/usr/local/lib/python3.7/site-packages/django_filters/widgets.py", line 201, in value_from_datadict
    return value.split(',')
AttributeError: 'list' object has no attribute 'split'
[12/Jul/2019 13:49:06] "GET /XXXXXXXX/?ordering=first_name HTTP/1.1" 500 59

它来自浏览 django-rest-framework 生成代码的列表。

嗨@moseb。 您可以粘贴您正在使用的 FilterSet 代码吗？

老实说，我还没有在代码的那个区域找到任何东西。 这可能都是由 DRF 完成的。 尚未确定。
我知道我的错误报告并不理想，但它是我目前最好的。 对不起！

您的 API 视图应该有filterset_class或filterset_fields ，或者如果您使用的是旧版本的 django-filter， filter_class和filter_fields 。

我发现了filter_class的使用——所以我猜你只是帮助我发现迁移到 django-filter 2.0的过程没有正确完成。 凉爽的！
从概念上讲，有什么东西可以阻止 django-filter 检测 2.x 之前的剩余内容并警告它们吗？ 它会警告但我错过了吗？ 关于这些的代码警告是否会成为拉取请求的受欢迎补充？

v2.0 删除了许多现有的弃用警告，因此您可以尝试针对 v1.0 运行测试套件，然后针对 django-filter 的 v1.1 运行测试套件。

假设这会在您更新时自行解决。 没有的话就回来。

现在在https://github.com/moseb/django-filter-issue-1103-demo 有可重现的问题演示。 请考虑重新打开此问题。 谢谢！

啊，这与ModelMultipleChoiceFilter不兼容 CSV mixin 以及in查找有关。 这里有两个独立但相关的问题。

您不需要对 m2m 字段进行in查找，因为多项选择过滤器已经提供了类似的行为。

你好！

啊，这与ModelMultipleChoiceFilter不兼容 CSV mixin 以及in查找有关。 这里有两个独立但相关的问题。

GitHub 上是否有针对这些问题的票证？

听起来像上面提到的那样让BaseCSVWidget.value_from_datadict更健壮并不能解决问题？ （我还没有完全理解这个问题。）

您不需要对 m2m 字段进行in查找，因为多项选择过滤器已经提供了类似的行为。

in允许检查exact上的多个值。 如果我不能使用ìn ，如何检查多个值？

PS：我们可以重新打开这张票吗？

听起来像上面提到的那样让BaseCSVWidget.value_from_datadict更健壮并不能解决问题？ （我还没有完全理解这个问题。）

可能。 如果该值已经是一个列表，它应该继续并返回该列表。 也就是说，我认为将 CSV 行为与SelectMultiple小部件混合使用是没有意义的。

in允许检查exact上的多个值。 如果我不能使用ìn ，如何检查多个值？

ModelMultipleChoiceFilter从 Q 对象构造一个 OR 查询。 所以，如果你有一个像/api/mymodel?m2m=a&m2m=b这样的查询字符串，你最终会得到一个像这样的过滤器调用

MyModel.objects.filter(Q(m2m='a') | Q(m2m='b'))

在 2.1 版本中， lookup_expr现在应用于每个 Q 对象，因此您最终会得到

MyModel.objects.filter(Q(m2m__in='a') | Q(m2m__in='b'))

以上是无效的并且会中断，但是对于contains和其他旨在使用单个值的查找是有意义的。

因此，简而言之，您需要在这里做的就是使用exact查找您的 m2m 字段。

我认为这里的待办事项是：

• 如果 BaseCSVWidget 已经是一个列表，则通过返回值来使BaseCSVWidget与SelectMultiple $ 兼容。 或者如果它不应该兼容，我们至少应该在 init 上提供一个有用的错误。
• 为 m2m 修复Meta.fields 。 为ModelMultipleChoiceFilter生成in查找是荒谬的。 我们还应该测试其他查找会发生什么，例如isnull ，它需要一个布尔值。

是的，这看起来仍然不像一个错误，但我猜它是如何工作的？

我刚刚遇到了这个错误，它的解释被埋在这个线程中，所以回顾一下并为未来的读者节省长时间的搜索：

在视图集的filterset_fields中声明的ManyToMany字段不得包含in

运行时发出警告将不胜感激。

@marcosox好主意。 很高兴看到公关添加了这一点！