"parent"资源中的姜戈美味派"ToManyField"似乎将 POST 中断到智利资源

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'])

您可以看到，我已经设置了一个"ToManyField"关系，以便让Event Invitees显示在Events资源的GET列表中。这工作正确。请注意，还有一个FK关系到"store"，这也是有效的。

当将以下内容发送到"EventInviteesResource"以创建和EventInvitee时出现错误:

文章http://X.X.X.X: 8000/api/v1/eventinvitees ?用户名= user& api_key = XXXXXXX

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

返回的错误是:

" 'invitees'字段没有数据，不允许为空值。"

注意，"invitees"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"， "invitees"错误消失，错误变成:

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

如果我试图发布这个:

{
    "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，在'invitees'关系不变的情况下，错误是:

{"error_message": "int() argument must be a string or a number, not 'dict'", "traceback": "Traceback (most recent call last):nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 192, in wrappern response = callback(request, *args, **kwargs)nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 397, in dispatch_listn return self.dispatch('list', request, **kwargs)nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 427, in dispatchn response = method(request, **kwargs)nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 1165, in post_listn updated_bundle = self.obj_create(bundle, request=request, **self.remove_api_resource_names(kwargs))nn File "/Users/jleidigh/Documents/Starbucks - In Office/trunk/backend/bbservices/api.py", line 234, in obj_createn return super(EventResource, self).obj_create(bundle, request, organizer_id=request.user.pk, store_id=bundle.data['store_id'])nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 1783, in obj_createn m2m_bundle = self.hydrate_m2m(bundle)nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 743, in hydrate_m2mn bundle.data[field_name] = field_object.hydrate_m2m(bundle)nn File "/Library/Python/2.7/site-packages/tastypie/fields.py", line 742, in hydrate_m2mn m2m_hydrated.append(self.build_related_resource(value, **kwargs))nn File "/Library/Python/2.7/site-packages/tastypie/fields.py", line 593, in build_related_resourcen return self.resource_from_data(self.fk_resource, value, **kwargs)nn File "/Library/Python/2.7/site-packages/tastypie/fields.py", line 548, in resource_from_datan return fk_resource.obj_update(fk_bundle, **data)nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 1814, in obj_updaten bundle.obj = self.obj_get(request, **lookup_kwargs)nn File "/Library/Python/2.7/site-packages/tastypie/resources.py", line 1752, in obj_getn base_object_list = self.get_object_list(request).filter(**kwargs)nn File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 624, in filtern return self._filter_or_exclude(False, *args, **kwargs)nn File "/Library/Python/2.7/site-packages/django/db/models/query.py", line 642, in _filter_or_excluden clone.query.add_q(Q(*args, **kwargs))nn File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py", line 1250, in add_qn can_reuse=used_aliases, force_having=force_having)nn File "/Library/Python/2.7/site-packages/django/db/models/sql/query.py", line 1185, in add_filtern connector)nn File "/Library/Python/2.7/site-packages/django/db/models/sql/where.py", line 69, in addn value = obj.prepare(lookup_type, value)nn File "/Library/Python/2.7/site-packages/django/db/models/sql/where.py", line 320, in preparen return self.field.get_prep_lookup(lookup_type, value)nn File "/Library/Python/2.7/site-packages/django/db/models/fields/related.py", line 137, in get_prep_lookupn return self._pk_trace(value, 'get_prep_lookup', lookup_type)nn File "/Library/Python/2.7/site-packages/django/db/models/fields/related.py", line 210, in _pk_tracen v = getattr(field, prep_func)(lookup_type, v, **kwargs)nn File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 310, in get_prep_lookupn return self.get_prep_value(value)nn File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 537, in get_prep_valuen return int(value)nnTypeError: 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

如果我注释"受邀者"行并POST到EventResource，错误就会消失，但是受邀者当然不会被创建。

所以……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?

非常感谢提前!!!!

Answer 1

好了，我找到了我自己的答案。在EventInviteesResource

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

需要如下内容来镜像我的Django模型:

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

虽然这看起来合乎逻辑，但我必须说，我得到的"受邀者"(注意"s")错误没有，但是哦，好吧…

额外答案，在EventResource，更新:

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

:

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

现在你可以发布到EventResource与邀请，并有那些自动创建。post数据看起来像这样:

{
    "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使用PK语法的fk:

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

这会导致错误，指出Store对象的字段不能为空，就好像它试图创建一个新的Store对象一样。如果我使用下面的URI路径，它可以正常工作:

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

但是我不希望必须传回完整的URI，而且我应该这样做。这就是为什么我在obj_create中使用store_id技巧，但它非常笨拙…

任何想法?

Answer 2

当你提供{"store":"/api/v1/store/2/"}时，你只指定EventResource的store值。但是当您提供{"store": {"pk":2}}时，您不仅可以指定store的值，还可以编辑store(保存相关对象)。这才是品味十足的"风格"。

我们能做的是构建一组Javascript函数来自动从/转换为资源uri。使用现有的Javascript MVC框架，如AgularJS或Backbone作为前端，Django tastype作为后端是非常强大的。