我希望tastypie创建一个UserProfileResource，因为我发布了一个UserResource。
models.py：
class UserProfile(models.Model):
home_address = models.TextField()
user = models.ForeignKey(User, unique=True)
resources.py
class UserProfileResource(ModelResource):
home_address = fields.CharField(attribute='home_address')
class Meta:
queryset = UserProfile.objects.all()
resource_name = 'profile'
excludes = ['id']
include_resource_uri = False
class UserResource(ModelResource):
profile = fields.ToOneField(UserProfileResource, 'profile', full=True)
class Meta:
queryset = User.objects.all()
resource_name = 'user'
allowed_methods = ['get', 'post', 'delete', 'put']
fields = ['username']
filtering = {
'username': ALL,
}
curl命令：
curl -v -H "Content-Type: application/json" -X POST --data '{"username":"me", "password":"blahblah", "profile":{"home_address":"somewhere"}}' http://127.0.0.1:8000/api/user/
但我得到了：
Django Version: 1.4
Exception Type: IntegrityError
Exception Value:
null value in column "user_id" violates not-null constraint
这似乎是一个鸡蛋和鸡蛋的场景。我需要user_id来创建UserProfileResource，我需要配置文件来创建UserResource。显然我做的事非常愚蠢。
那里的任何人都能发光吗？ 非常感谢 johnoc
我修改了我的代码，如下面Pablo所建议的那样。
class UserProfileResource(StssRessource):
home_address = fields.CharField(attribute='home_address')
user = fields.ToOneField('resources.UserResource', attribute='user', related_name='profile')
class Meta:
queryset = UserProfile.objects.all()
resource_name = 'profile'
class UserResource(ModelResource):
profile = fields.ToOneField('resources.UserProfileResource', attribute='profile', related_name = 'user', full=True)
class Meta:
queryset = User.objects.all()
resource_name = 'user'
但是我得到了：
Django Version: 1.4
Exception Type: DoesNotExist
这与尝试访问ORM中的User资源有关，在创建related_objects UserProfileResource时它不存在。哪个是对的。在创建related_objects之前，不会创建用户ORM。
其他人见过这个？
答案 0 :(得分：15)
2天后我终于设法保存相关资源，问题是你必须指定关系的两面及其相关名称，在你的情况下它会是这样的：
class UserProfileResource(ModelResource):
home_address = fields.CharField(attribute='home_address')
user = fields.ToOneField('path.to.api.UserResource', attribute='user', related_name='profile')
#in my case it was a toManyField, I don't know if toOneField works here, you can try toManyField.
class UserResource(ModelResource):
profile = fields.ToOneField(UserProfileResource, 'profile', related_name='user', full=True)
答案 1 :(得分：0)
编辑＃2：最后想出了如何修复问题，但不幸的是它需要一些子类化和覆盖。以下是我的工作方式：
首先，创建一个新的字段子类 - 我调用了我的RelatedToOneField：
from tastypie.bundle import Bundle
from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
from tastypie.exceptions import ApiFieldError, NotFound
class RelatedToOneField(fields.RelatedField):
"""
Provides access to related data via foreign key.
This subclass requires Django's ORM layer to work properly.
"""
help_text = 'A single related resource. Can be either a URI or set of nested resource data.'
def __init__(self, to, attribute, related_name=None, default=fields.NOT_PROVIDED,
null=False, blank=False, readonly=False, full=False,
unique=False, help_text=None):
super(RelatedToOneField, self).__init__(
to, attribute, related_name=related_name, default=default,
null=null, blank=blank, readonly=readonly, full=full,
unique=unique, help_text=help_text
)
self.fk_resource = None
def dehydrate(self, bundle):
try:
foreign_obj = getattr(bundle.obj, self.attribute)
except ObjectDoesNotExist:
foreign_obj = None
if not foreign_obj:
if not self.null:
raise ApiFieldError("The model '%r' has an empty attribute '%s' and doesn't allow a null value." % (bundle.obj, self.attribute))
return None
self.fk_resource = self.get_related_resource(foreign_obj)
fk_bundle = Bundle(obj=foreign_obj, request=bundle.request)
return self.dehydrate_related(fk_bundle, self.fk_resource)
def hydrate(self, bundle):
value = super(RelatedToOneField, self).hydrate(bundle)
if value is None:
return value
# START OF MODIFIED CONTENT
kwargs = {
'request': bundle.request,
}
if self.related_name:
kwargs['related_obj'] = bundle.obj
kwargs['related_name'] = self.related_name
return self.build_related_resource(value, **kwargs)
#return self.build_related_resource(value, request=bundle.request)
#END OF MODIFIED CONTENT
然后覆盖obj_create＆amp;你的＆＃34; top＆＃34;中的save_related函数模型，或者在这种情况下，UserResource。以下是相关的覆盖：
def obj_create(self, bundle, request=None, **kwargs):
"""
A ORM-specific implementation of ``obj_create``.
"""
bundle.obj = self._meta.object_class()
for key, value in kwargs.items():
setattr(bundle.obj, key, value)
bundle = self.full_hydrate(bundle)
# Save the main object.
# THIS HAS BEEN MOVED ABOVE self.save_related().
bundle.obj.save()
# Save FKs just in case.
self.save_related(bundle)
# Now pick up the M2M bits.
m2m_bundle = self.hydrate_m2m(bundle)
self.save_m2m(m2m_bundle)
return bundle
def save_related(self, bundle):
"""
Handles the saving of related non-M2M data.
Calling assigning ``child.parent = parent`` & then calling
``Child.save`` isn't good enough to make sure the ``parent``
is saved.
To get around this, we go through all our related fields &
call ``save`` on them if they have related, non-M2M data.
M2M data is handled by the ``ModelResource.save_m2m`` method.
"""
for field_name, field_object in self.fields.items():
if not getattr(field_object, 'is_related', False):
continue
if getattr(field_object, 'is_m2m', False):
continue
if not field_object.attribute:
continue
# Get the object.
# THIS HAS BEEN MOVED ABOVE the field_object.blank CHECK
try:
related_obj = getattr(bundle.obj, field_object.attribute)
except ObjectDoesNotExist:
related_obj = None
# THE 'not related_obj' CHECK HAS BEEN ADDED
if field_object.blank and not related_obj: # ADDED
continue
# Because sometimes it's ``None`` & that's OK.
if related_obj:
# THIS HAS BEEN ADDED
setattr(related_obj, field_object.related_name, bundle.obj) # ADDED
related_obj.save()
setattr(bundle.obj, field_object.attribute, related_obj)
将这些内容添加到API后，一切都应该有效（至少在0.9.11上）。修复程序的主要部分是toOneField没有正确添加related_obj。我的RelatedToOneField子类将此检查实现到字段水合代码中。
编辑：我错了，ToOneField仍然没有在0.9.12工作。我的问题是，已经有一个UserProfileResource，其中包含我试图在数据库中发布的相同数据。它只是抓住那一行并修改它而不是创造新的东西。
在花费太多时间之后，似乎ToOneField的错误在0.9.12版本中得到修复（请参阅Pablo的相关讨论中的评论）。
如果django-tastypie＆gt; = 0.9.12，则以下内容应该有效：
class UserResource(ModelResource):
profile = fields.ToOneField('path.to.api.UserProfileResource', 'profile', related_name='user', full=True)
class UserProfileResource(ModelResource):
home_address = fields.CharField(attribute='home_address')
user = fields.ToOneField(UserResource, attribute='user', related_name='profile')
如果django-tastypie＆lt; 0.9.12，您需要执行以下操作：
class UserResource(ModelResource):
profile = fields.ToOneField('path.to.api.UserProfileResource', 'profile', related_name='user', full=True)
class UserProfileResource(ModelResource):
home_address = fields.CharField(attribute='home_address')
user = fields.ToManyField(UserResource, attribute='user', related_name='profile')
注意：切换UserResource＆amp;的顺序UserProfileResource因为这对我的心理模型更有意义。