Django Rest Framework - 同一 api 调用中的两个模型

Question

我正在尝试使用 Django Rest Framework 做一些事情。 我有一个类通过外键链接到另一个类。 现在，我想创建一个 API 调用来创建这两个模型。

class A(models.Model):
     text = models.CharField(...)
...


class B(models.Model):
...
      myfield= models.ForeignKey(A)

没关系。

class SerializerForB(serializers.HyperlinkedModelSerializer):
    text = serializers.CharField()
....

这也很好(我已经设置了元等)。如果我转到 API 的 URL，我会看到包含 B 的所有字段以及用于放置 A 文本的字段的表单。

然后我写了这个 View

class BCreate(CreateAPIView):
    serializer_class = SerializerForB


def pre_save(self, obj):
    b = B(text=self.request.DATA['text'])
    b.save()
    obj.B=b

问题在于 A 的实际保存，并且数据具有它所说的字段 text

'text' is an invalid keyword argument for this function

我应该编写一个 API 来创建 A 并在通过 API 创建 B 时使用 pk 吗？或者我可以在一次通话中同时完成这两项操作吗？

环境:

Request Method: POST
Request URL: http://localhost:8000/api/task/human/create/

Django Version: 1.5.1
Python Version: 2.7.2
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.humanize',
 'django.contrib.messages',
 'django.contrib.flatpages',
 'django.contrib.markup',
 'django.contrib.admin',
 'general',
 'requester',
 'executor',
 'crispy_forms',
 'social_auth',
 'developer',
 'restapi',
 'requests',
 'rest_framework',
 'rest_framework.authtoken',
 'djrill',
 'mturk',
 'jsonify',
 'gravatar')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Traceback:
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  115.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/django/views/generic/base.py" in view
  68.             return self.dispatch(request, *args, **kwargs)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
  77.         return view_func(*args, **kwargs)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  326.             response = self.handle_exception(exc)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  323.             response = handler(request, *args, **kwargs)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/generics.py" in post
  361.         return self.create(request, *args, **kwargs)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/mixins.py" in create
  50.         if serializer.is_valid():
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/serializers.py" in is_valid
  478.         return not self.errors
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/serializers.py" in errors
  470.                 ret = self.from_native(data, files)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/serializers.py" in from_native
  866.         instance = super(ModelSerializer, self).from_native(data, files)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/serializers.py" in from_native
  323.             return self.restore_object(attrs, instance=getattr(self, 'object', None))
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/rest_framework/serializers.py" in restore_object
  851.             instance = self.opts.model(**attrs)
File "/Users/stefanotranquillini/.virtualenvs/CC/lib/python2.7/site-packages/django/db/models/base.py" in __init__
  415.                 raise TypeError("'%s' is an invalid keyword argument for this function" % list(kwargs)[0])

Exception Type: TypeError at /api/task/human/create/
Exception Value: 'reward_quantity' is an invalid keyword argument for this function

Answer 1

当您尝试使用 B(text=self.request.DATA['text']) 实例化模型类“B”时，它会引发您所看到的异常，大概是模型类 B 没有 text 字段。