"ToManyField"资源中的 Django Tastypie "parent"似乎破坏了对智利资源的 POST

Question

我使用的是 Django 1.4.3 和 TastyPie 0.9.11。

我有以下两个 django 模型:

class Event(models.Model):
    organizer = models.ForeignKey(User, related_name='Organizador')
    store = models.ForeignKey(Store, related_name='Tienda')
    name = models.CharField('Titulo', max_length=50)
    event_time = models.DateTimeField('Fecha y Hora del Evento')
    creation_date = models.DateTimeField('Fecha de Creación', auto_now_add=True)
    requires_confirmation = models.BooleanField('Require Confirmación')

    class Meta:
        verbose_name = "Encuentro"
        verbose_name_plural = "Encuentros"


class EventInvitees(models.Model):
    event = models.ForeignKey(Event, related_name='invitees')
    invitee = models.ForeignKey(User, verbose_name='Invitado')
    confirmed = models.BooleanField('Confirmado')
    confirmation_date = models.DateTimeField('Fecha de Confirmación', null=True, auto_now=True)

    class Meta:
        verbose_name = "Invitados"
        verbose_name_plural = "Invitados"

然后我有以下 API 资源:

class EventInviteesResource(ModelResource):
    user = fields.ForeignKey(UserResource, 'invitee', full=True)
    event = fields.ForeignKey('bbservices.api.EventResource', 'event')

    class Meta:
        queryset = EventInvitees.objects.all()
        authentication = ApiKeyAuthentication()
        authorization = Authorization()


class EventResource(ModelResource):
    invitees = fields.ToManyField('bbservices.api.EventInviteesResource', 'invitees', full=True)
    store = fields.ForeignKey(StoreResource, 'store', full=True)

    class Meta:
        #default_format = 'application/json'

        queryset = Event.objects.all()

        fields = ['organizer_id', 'store', 'name', 'event_time', 'requires_confirmation']
        include_resource_uri = False
        #list_allowed_methods = ['get', 'post']
        authentication = ApiKeyAuthentication()
        authorization = Authorization()
        filtering = {
            #'user': ALL_WITH_RELATIONS
            'event_time': ['exact', 'range', 'gt', 'gte', 'lt', 'lte'],
        }

    def dehydrate_event_time(self, bundle):
        return bundle.data['event_time']

    def obj_create(self, bundle, request=None, **kwargs):
        return super(EventResource, self).obj_create(bundle, request, organizer_id=request.user.pk, store_id=bundle.data['store_id'])

如您所见，我设置了“ToManyField”关系，以便让事件受邀者显示在事件资源的 GET 列表中。这工作正常。请注意，与“商店”也存在 FK 关系，这也有效。

将以下内容发布到“EventInviteesResource”以创建 EventInvitee 时出现错误:

发布http://X.X.X.X:8000/api/v1/eventinvitees/?username=user&api_key=XXXXXXX

{
  "event" : {"pk" : 30},
  "invitee" : 2,
  "confirmed" : true
}

返回的错误是:

“‘受邀者’字段没有数据，并且不允许为空值。”

请注意，“受邀者”不存在于“EventInviteesResource”中，而是存在于“父”资源“EventResource”中。所以我不明白这怎么可能是一个错误。 如果我注释掉这一行:

invitees = fields.ToManyField('bbservices.api.EventInviteesResource', 'invitees', full=True)

资源“EventResource”中的“invitees”错误消失，错误变为:

{"error_message": "", "traceback": "Traceback (most recent call last):\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 192, in wrapper\n response = callback(request, *args, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 397, in dispatch_list\n return self.dispatch('list', request, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 427, in dispatch\n response = method(request, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1165, in post_list\n updated_bundle = self.obj_create(bundle, request=request, **self.remove_api_resource_names(kwargs))\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1774, in obj_create\n bundle = self.full_hydrate(bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 698, in full_hydrate\n value = field_object.hydrate(bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/fields.py\", line 636, in hydrate\n value = super(ToOneField, self).hydrate(bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/fields.py\", line 154, in hydrate\n elif self.attribute and getattr(bundle.obj, self.attribute, None):\n\n File \"/Library/Python/2.7/site-packages/django/db/models/fields/related.py\", line 343, in __get__\n raise self.field.rel.to.DoesNotExist\n\nDoesNotExist\n"}

如果我尝试发布此内容:

{
    "store_id" : 1, 
    "name" : "With Invitees", 
    "event_time" : "2013-02-06T18:30-3:00",
    "requires_confirmation" : true,
    "invitees" : [
                    {
                      "invitee": {"pk" : 1}
                    }
                ]
}

到资源EventResource，“受邀者”关系完好无损，错误为:

{"error_message": "int() argument must be a string or a number, not 'dict'", "traceback": "Traceback (most recent call last):\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 192, in wrapper\n response = callback(request, *args, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 397, in dispatch_list\n return self.dispatch('list', request, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 427, in dispatch\n response = method(request, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1165, in post_list\n updated_bundle = self.obj_create(bundle, request=request, **self.remove_api_resource_names(kwargs))\n\n File \"/Users/jleidigh/Documents/Starbucks - In Office/trunk/backend/bbservices/api.py\", line 234, in obj_create\n return super(EventResource, self).obj_create(bundle, request, organizer_id=request.user.pk, store_id=bundle.data['store_id'])\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1783, in obj_create\n m2m_bundle = self.hydrate_m2m(bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 743, in hydrate_m2m\n bundle.data[field_name] = field_object.hydrate_m2m(bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/fields.py\", line 742, in hydrate_m2m\n m2m_hydrated.append(self.build_related_resource(value, **kwargs))\n\n File \"/Library/Python/2.7/site-packages/tastypie/fields.py\", line 593, in build_related_resource\n return self.resource_from_data(self.fk_resource, value, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/fields.py\", line 548, in resource_from_data\n return fk_resource.obj_update(fk_bundle, **data)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1814, in obj_update\n bundle.obj = self.obj_get(request, **lookup_kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1752, in obj_get\n base_object_list = self.get_object_list(request).filter(**kwargs)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/query.py\", line 624, in filter\n return self._filter_or_exclude(False, *args, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/query.py\", line 642, in _filter_or_exclude\n clone.query.add_q(Q(*args, **kwargs))\n\n File \"/Library/Python/2.7/site-packages/django/db/models/sql/query.py\", line 1250, in add_q\n can_reuse=used_aliases, force_having=force_having)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/sql/query.py\", line 1185, in add_filter\n connector)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/sql/where.py\", line 69, in add\n value = obj.prepare(lookup_type, value)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/sql/where.py\", line 320, in prepare\n return self.field.get_prep_lookup(lookup_type, value)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/fields/related.py\", line 137, in get_prep_lookup\n return self._pk_trace(value, 'get_prep_lookup', lookup_type)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/fields/related.py\", line 210, in _pk_trace\n v = getattr(field, prep_func)(lookup_type, v, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py\", line 310, in get_prep_lookup\n return self.get_prep_value(value)\n\n File \"/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py\", line 537, in get_prep_value\n return int(value)\n\nTypeError: int() argument must be a string or a number, not 'dict'\n"}

我相信这个错误记录在这里:

https://github.com/toastdriven/django-tastypie/issues/307

如果我评论“受邀者”行并 POST 到 EventResource，错误就会消失，但当然不会创建受邀者。

那么......有人有什么想法吗？这只是与问题 307(上面的链接)相关的另一个错误还是我做错了什么？？

提前非常感谢!!!!

Answer 1

好的，我找到了自己的答案。在 EventInviteesResource 中

user = fields.ForeignKey(UserResource, 'invitee', full=True)

需要如下才能镜像我的 Django 模型:

invitee = fields.ForeignKey(UserResource, 'invitee', full=True)

虽然这看起来确实合乎逻辑，但我必须说我收到的“受邀者”(注意“s”)错误并不符合逻辑，但哦好吧......

奖励答案，在 EventResource 中，更新:

invitees = fields.ToManyField('bbservices.api.EventInviteesResource', 'invitees', full=True)

致:

invitees = fields.ToManyField('bbservices.api.EventInviteesResource', 'invitees', related_name='event', full=True)

现在您可以与受邀者一起发布到 EventResource，并自动创建受邀者。发布数据将如下所示:

{
    "store" : "/api/v1/store/2/", 
    "name" : "Yes again?", 
    "event_time" : "2013-02-06T18:30-3:00",
    "requires_confirmation" : true,
    "invitees" : [
                    {
                      "invitee" : "/api/v1/user/1/",
                      "confirmed" : true
                    }
                ]
}

所以现在我唯一的疑问是......谁能告诉我为什么我不能对 FK 使用 PK 语法:

{ "store" : {"pk" : 2}, ...

这会导致错误，指出 Store 对象的字段不能为 null，就像尝试创建新的 store 对象一样。如果我使用如下所示的 URI 路径，则效果很好:

{ "store" : "/api/v1/store/2/", ...

但我不希望必须传回完整的 URI，而我应该必须这样做。 这就是为什么我在 obj_create 中使用 store_id 技巧，但它非常笨拙......

有什么想法吗？