我正在使用此处描述的类立面模式: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,抛出一个错误。
最佳答案
您应该引发异常:tastypie.exceptions.NotFound(根据代码文档)。
我正在为 CouchDB 开发 tastypie,并深入研究了这个问题。在 tastypie.resources.Resource 类中,您可以找到必须覆盖的方法:
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
有一件事对我来说很奇怪。当我查看 ModelResource 类(Resource 类的父类(super class))中的 obj_get 方法时:
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).")
一个异常:self._meta.object_class.DoesNotExist 在找不到对象时被抛出,最终成为 ObjectDoesNotExist 异常——所以项目内部没有达成共识。
关于python - 当 tastypie 连接非 ORM 源时,如何返回 404?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10899148/