无法创建新模型并将其保存到数据库中.Django rest 框架视图模型集

Question

我有一个 django rest 框架项目。我正在尝试构建一个覆盖模型视图集的默认创建方法的视图集。现在，我正在从 POSt 请求和 url 参数中获取我需要获取的所有数据。我正在尝试将它们存储到数据对象中，然后基于相同的数据对象在数据库中创建一个新对象。

所有数据都是正确的，并在对象中设置。如何使对象可保存。我收到一个错误，我认为它来自我尝试保存时。不过我不确定....

模型视图集 - 创建方法：

    @permission_classes((IsAuthenticated))
    def create(self, request, *args, **kwargs):
        namespace = self.kwargs.get('namespace', None)
        path = self.kwargs.get('path', None)
        print(request.user)
        print(request.POST.get('version'))
        print(request.POST.get('namespace'))
        print(request.POST.get('path'))
        print(request.POST.get('value'))
        print(request.user.id)
        if namespace is None and path is None:
            return super().create(request)
        if namespace and path is None:
            data = {
                "person":request.user,
                'version':request.Post.get('version'),
                'namespace':namespace,
                'path':request.Post.get('path'),
                'value':request.Post.get('value'),
                'user_id':request.user.id,
            }
            return super().create(data)
        if namespace and path:
            data = {
                "person":self.request.user,
                'version':self.request.Post.get('version'),
                'namespace':namespace,
                'path':path,
                'value':self.request.Post.get('value'),
                'user_id':self.request.user.id,
            }
            return super().create(data)

型：

from django.db import models
from django.contrib.auth.models import User
from owf_framework.people.models import Person
class Preference(models.Model):
    id = models.BigAutoField(primary_key=True, null=False)
    version = models.BigIntegerField(default=1, null=False)
    path = models.CharField(max_length=200, null=False)
    namespace = models.CharField(max_length=200, null=False)
    value = models.TextField(null=False)
    user_id = models.BigIntegerField(null=False, default=1)
    person = models.ForeignKey(User, on_delete=models.CASCADE)
    def __str__(self):
        return self.namespace
    class Meta:
        db_table = 'preference'

这是错误：

AttributeError at /api/v2/preferences/namespace1/
'Request' object has no attribute 'Post'
Request Method: POST
Request URL:    http://127.0.0.1:8000/api/v2/preferences/namespace1/
Django Version: 2.2.1
Exception Type: AttributeError
Exception Value:    
'Request' object has no attribute 'Post'
Exception Location: C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkrequest.py in __getattr__, line 414
Python Executable:  C:UsersjandaliAppDataLocalProgramsPythonPython37-32python.exe
Python Version: 3.7.3
Python Path:    
['C:\Users\jandali\desktop\ozone-backend\ozone-framework-python-server',
 'C:\Users\jandali\AppData\Local\Programs\Python\Python37-32\python37.zip',
 'C:\Users\jandali\AppData\Local\Programs\Python\Python37-32\DLLs',
 'C:\Users\jandali\AppData\Local\Programs\Python\Python37-32\lib',
 'C:\Users\jandali\AppData\Local\Programs\Python\Python37-32',
 'C:\Users\jandali\AppData\Roaming\Python\Python37\site-packages',
 'C:\Users\jandali\AppData\Local\Programs\Python\Python37-32\lib\site-packages']
Server time:    Wed, 10 Jul 2019 04:22:02 +0000
Traceback Switch to copy-and-paste view
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkrequest.py in __getattr__
            return getattr(self._request, attr) …
▶ Local vars
During handling of the above exception ('WSGIRequest' object has no attribute 'Post'), another exception occurred:
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesdjangocorehandlersexception.py in inner
            response = get_response(request) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesdjangocorehandlersbase.py in _get_response
                response = self.process_exception_by_middleware(e, request) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesdjangocorehandlersbase.py in _get_response
                response = wrapped_callback(request, *callback_args, **callback_kwargs) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesdjangoviewsdecoratorscsrf.py in wrapped_view
        return view_func(*args, **kwargs) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkviewsets.py in view
            return self.dispatch(request, *args, **kwargs) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkviews.py in dispatch
            response = self.handle_exception(exc) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkviews.py in handle_exception
            self.raise_uncaught_exception(exc) …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkviews.py in dispatch
            response = handler(request, *args, **kwargs) …
▶ Local vars
C:Usersjandalidesktopozone-backendozone-framework-python-serverowf_frameworkpreferencesviews.py in create
                'version':request.Post.get('version'), …
▶ Local vars
C:UsersjandaliAppDataLocalProgramsPythonPython37-32libsite-packagesrest_frameworkrequest.py in __getattr__
            return self.__getattribute__(attr) 

Answer 1

request对象没有任何名为 Post 的属性。它可以是request.POST，也可以从request.data中获取数据，也可以在DRF中获取数据。

另外，我认为这一行有问题：

return super().create(data)

原因是，在调用超类时，需要匹配其方法签名。这意味着，在调用超类时需要传递适当的参数和关键字参数。所以它应该是这样的：

return super().create(request, *args, **kwargs)

现在，根据create方法的实现，它不需要您准备的任何名为data参数。因为它使用序列化程序中的 request.data 参数来创建对象。

所以我认为你可以这样进行：

 from rest_framework import status
 from rest_framework.response import 

@permission_classes((IsAuthenticated))
def create(self, request, *args, **kwargs):
    namespace = self.kwargs.get('namespace', None)
    path = self.kwargs.get('path', None)
    if namespace is None and path is None:
        return super().create(request, *args, **kwargs)
    if namespace and path is None:
        data = {
            "person":request.user.id,
            'version':request.data.get('version'),
            'namespace':namespace,
            'path':request.data.get('path'),
            'value':request.data.get('value'),
            'user_id':request.user.id,
        }
    if namespace and path:
        data = {
            "person":request.user.id,
            'version':request.data.get('version'),
            'namespace':namespace,
            'path':path,
            'value':request.data.get('value'),
            'user_id':request.user.id,
        }
    serializer = self.get_serializer(data=data)
    serializer.is_valid(raise_exception=True)
    self.perform_create(serializer)
    headers = self.get_success_headers(serializer.data)
    return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)