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Tastypie API を使用してアイテムを保存しているときに問題が発生しました。（POST方式）

これが私の api.py コードです。

from tastypie.resources import ModelResource, ALL, ALL_WITH_RELATIONS
from tastypie.authorization import DjangoAuthorization
from tastypie.authentication import BasicAuthentication
from tastypie import fields
from apps.clients.models import Client
from django.contrib.auth.models import User

class ClientAPI(ModelResource):
    users = fields.ToManyField('apps.clients.api.ClientUserAPI', 'users',related_name='entry',full=True)


    class Meta:
        queryset = Client.objects.all()
        resource_name="clients"
        authentication = BasicAuthentication()
        authorization = DjangoAuthorization()
        filtering={
            "users":ALL
        }

    def hydrate_m2m(self,bundle):
        if bundle.data.get("users"):
            for user_id in bundle.data["users"]:
                new_user = User.objects.get(id=user_id)
                bundle.obj.users.add(new_user)


class ClientUserAPI(ModelResource):
    class Meta:
        queryset = User.objects.all()
        resource_name = 'users'
        fields = ['username', 'first_name', 'last_name', 'last_login']
        authentication = BasicAuthentication()
        authorization = DjangoAuthorization()

im POST data の場合、保存は成功しますが、エラーが発生します。

{"error_message": "'NoneType' object has no attribute 'obj'", "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 1784, in obj_create\n self.save_m2m(m2m_bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1942, in save_m2m\n related_mngr = getattr(bundle.obj, field_object.attribute)\n\nAttributeError: 'NoneType' object has no attribute 'obj'\n"}

"return bundle" 行を hydrate_m2m に追加すると、m2m の保存が成功しません (空白)、それでもこのようなエラーが発生します。

{"error_message": "'str' object has no attribute 'obj'", "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 1784, in obj_create\n self.save_m2m(m2m_bundle)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 1951, in save_m2m\n related_bundle.obj.save()\n\nAttributeError: 'str' object has no attribute 'obj'\n"}

コードから hydrate_m2m を削除すると、返されるエラーは次のとおりです。

{"error_message": "The URL provided '1' was not a link to a valid resource.", "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 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 588, in build_related_resource\n return self.resource_from_uri(self.fk_resource, value, **kwargs)\n\n File \"/Library/Python/2.7/site-packages/tastypie/fields.py\", line 522, in resource_from_uri\n obj = fk_resource.get_via_uri(uri, request=request)\n\n File \"/Library/Python/2.7/site-packages/tastypie/resources.py\", line 636, in get_via_uri\n raise NotFound(\"The URL provided '%s' was not a link to a valid resource.\" % uri)\n\nNotFound: The URL provided '1' was not a link to a valid resource.\n"}

「1」が提供されたURLはユーザーIDだと思います。

教えてください。何が間違っているのですか？

ところで、私は英語がよくわかりません。申し訳ありません。

4

1 に答える 1

7

ユーザー リソースをコンマ区切りの ID として投稿していることは確かです。これは、tastypie がデフォルトで関連するリソースを処理する方法ではありません。あなたの場合、関連するリソースを指す URL のリストを投稿する必要があります - 「/api/v1/users/1」のようなものです。

代わりに、hydrate_m2m を hydrate_users に変更することもできます。一般的な hydrate_m2m は、リソース内のすべてのフィールドを繰り返し処理し、url-string から関連リソースのインスタンスに変換しようとします (そのため、「提供された URL」に関するエラーが発生します)。hydrate_users のコードは次のようになります。

def hydrate_users(self, bundle):
    try:
        user_ids = map(int, bundle.data.get('users', []))
    except ValueError:
        raise BadRequest("User ids must be ints") # from tastypie.exceptions
    bundle.data['users'] = User.objects.filter(id__in=user_ids)
    return bundle

お役に立てれば

編集：intカーソンが提案したようにラムダを削除しました

于 2012-07-04T22:29:49.817 に答える