我在使用 Django 导入导出时面临当前问题：
在我的 admin.py 里面：
class QuestionResource(resources.ModelResource):
category = fields.Field(
column_name='category',
attribute='category',
widget=ForeignKeyWidget(Category, 'category')
)
class Meta:
model = Question
fields = ['id', 'question', 'category', 'answer',]
# exclude = ('created', 'modified', 'verified', 'count', 'user_created')
# PREVIOUS THINGS I TRIED:
# def _post_import(model, **kwargs):
# query = self.fields['category']
# category = Question.objects.get_or_create(category=query)
# return category
# def before_import(self, dataset, dry_run, *args, **kwargs):
# query = self.fields['category']
# for q in query:
# Category.objects.get_or_create(category=q)
# def before_import_row(row, *args, **kwargs):
# category = self.fields['category']
# Category.objects.get_or_create(category=category)
def before_import_row(row, *args, **kwargs):
category = row.fields['category']
Category.objects.get_or_create(category=category)
如您所见，我添加了以前尝试过的内容作为评论。我收到的错误是：
Errors
Line number: 5 - Category matching query does not exist.
Pokemon, 9526, Is er een voorvak?, Ja, bij de Alpha is een voorvak.
Traceback (most recent call last):
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/import_export/resources.py", line 457, in import_row
self.import_obj(instance, row, dry_run)
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/import_export/resources.py", line 329, in import_obj
self.import_field(field, obj, data)
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/import_export/resources.py", line 316, in import_field
field.save(obj, data, is_m2m)
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/import_export/fields.py", line 115, in save
cleaned = self.clean(data)
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/import_export/fields.py", line 69, in clean
value = self.widget.clean(value, row=data)
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/import_export/widgets.py", line 334, in clean
return self.get_queryset(value, row, *args, **kwargs).get(**{self.field: val})
File "/Users/iam-tony/.envs/lib/python3.6/site-packages/django/db/models/query.py", line 403, in get
self.model._meta.object_name
questions.models.DoesNotExist: Category matching query does not exist.
我错过了什么？我似乎找不到任何关于此的文档(或者有，但我不明白(
提前感谢！
什么是类别#类别字段？类别的名称？一根绳子？
尝试将该字段重置为创建的类别的主键：
def before_import_row(self, row, **kwargs):
name = row.get('category')
(cat, _created) = Category.objects.get_or_create(name=name)
row['category'] = cat.id