[英]How do I return 404 when tastypie is interfacing non-ORM sources?
我正在使用這里描述的類似外觀的模式: http : //django-tastypie.readthedocs.org/en/latest/non_orm_data_sources.html
def obj_get(self, request=None, **kwargs):
rv = MyObject(init=kwargs['pk'])
audit_trail.message( ... )
return rv
我不能返回None,拋出一個錯誤。
您應該引發異常: tastypie.exceptions.NotFound (根據代碼文檔)。
我正在研究CouchDB的tastypie並深入研究這個問題。 在tastypie.resources.Resource類中,您可以找到必須覆蓋的方法:
def obj_get(self, request=None, **kwargs):
"""
Fetches an individual object on the resource.
This needs to be implemented at the user level. If the object can not
be found, this should raise a ``NotFound`` exception.
``ModelResource`` includes a full working version specific to Django's
``Models``.
"""
raise NotImplementedError()
我的例子:
def obj_get(self, request=None, **kwargs):
"""
Fetches an individual object on the resource.
This needs to be implemented at the user level. If the object can not
be found, this should raise a ``NotFound`` exception.
"""
id_ = kwargs['pk']
ups = UpsDAO().get_ups(ups_id = id_)
if ups is None:
raise NotFound(
"Couldn't find an instance of '%s' which matched id='%s'."%
("UpsResource", id_))
return ups
有一點對我來說很奇怪。 當我在ModelResource類(Resource類的超類)中查看obj_get方法時:
def obj_get(self, request=None, **kwargs):
"""
A ORM-specific implementation of ``obj_get``.
Takes optional ``kwargs``, which are used to narrow the query to find
the instance.
"""
try:
base_object_list = self.get_object_list(request).filter(**kwargs)
object_list = self.apply_authorization_limits(request, base_object_list)
stringified_kwargs = ', '.join(["%s=%s" % (k, v) for k, v in kwargs.items()])
if len(object_list) <= 0:
raise self._meta.object_class.DoesNotExist("Couldn't find an instance of '%s' which matched '%s'." % (self._meta.object_class.__name__, stringified_kwargs))
elif len(object_list) > 1:
raise MultipleObjectsReturned("More than '%s' matched '%s'." % (self._meta.object_class.__name__, stringified_kwargs))
return object_list[0]
except ValueError:
raise NotFound("Invalid resource lookup data provided (mismatched type).")
異常:self._meta.object_class.DoesNotExist在找不到對象時引發,最終變為ObjectDoesNotExist異常 - 因此它在項目內部不一致。
我使用django.core.exceptions中的ObjectDoesNotExist exeption
def obj_get(self, request=None, **kwargs):
try:
info = Info.get(kwargs['pk'])
except ResourceNotFound:
raise ObjectDoesNotExist('Sorry, no results on that page.')
return info
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