1

我尝试关注：https ://github.com/bmihelac/django-import-export/blob/master/docs/getting_started.rst

我将资源定义如下：

from import_export import resources
from core_backend.models.exhibitor import Exhibitor
from django.contrib.auth.models import User
from import_export import fields


class ExhibitorResource(resources.ModelResource):
    email = fields.Field()

    class Meta:
        model = Exhibitor
        fields = ('id', 'stand_id', 'email', 'title')

    def dehydrate_email(self, exhibitor):
        email = User.objects.filter(id=exhibitor.user_id)[0].email
        return email

然后在shell中我尝试：

import tablib
from import_export import resources
from core_backend.models.exhibitor import Exhibitor
from core_backend.models.exhibitor_resource import ExhibitorResource
my_res = ExhibitorResource()
my_res.fields
#{'email': <import_export.fields.Field: email>, u'id': <import_export.fields.Field: id>, 'title': <import_export.fields.Field: title>, 'stand_id': <import_export.fields.Field: stand_id>}
dataset = tablib.Dataset(['', '2', 'w@x.pl', 'fooo'],
                         headers=['id', 'stand_id', 'email', 'title'])
res = my_res.import_data(dataset, dry_run=True)
res.has_errors()
True

是什么原因？has_errors()是针对 Resource 还是整个模型进行验证？

我的资源定义是：

a) 模型字段的子集Exhibitor

emailb）添加了不在Exhibitor类中的额外字段

更新：

我跑raise_errors=True

res = my_res.import_data(dataset, dry_run=True,raise_errors=True)

它打印：

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/resources.py", line 350, in import_data
    six.reraise(*sys.exc_info())
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/resources.py", line 335, in import_data
    self.import_obj(instance, row, real_dry_run)
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/resources.py", line 201, in import_obj
    self.import_field(field, obj, data)
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/resources.py", line 193, in import_field
    field.save(obj, data)
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/fields.py", line 83, in save
    setattr(obj, self.attribute, self.clean(data))
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/fields.py", line 51, in clean
    value = self.widget.clean(value)
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/import_export/widgets.py", line 137, in clean
    return self.model.objects.get(pk=pk) if pk else None
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/django/db/models/manager.py", line 151, in get
    return self.get_queryset().get(*args, **kwargs)
  File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/django/db/models/query.py", line 307, in get
    self.model._meta.object_name)
DoesNotExist: Stand matching query does not exist.
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1 回答 1

0

这是一个非常古老的问题，但如果有人遇到同样的问题，这是一个可能的答案。之所以Django提出这个问题，是因为模型Exhibitor有一个附加到模型中的外键的字段Stand。（我在我的项目中解决了一个类似的问题，在模型中添加了相应的值）。

对于这种情况stand_id，模型中应该存在Stand：

展台型号：

stand_id, my_column
2, my_value

然后我们可以使用：

dataset = tablib.Dataset(['', '2', 'w@x.pl', 'fooo'],
                         headers=['id', 'stand_id', 'email', 'title'])

既然stand_id 2存在，错误应该消失了......

于 2019-07-30T18:04:52.470 回答