Question

=”“

用户位于具有id（父表/模型）的患者的DetailView中，或者选择患者来创建子（表/模型）对象（我希望这是准确的术语）。我正在尝试使用父表中的正确外键“预填充”我的表单。基本上，每位患者将有几次就诊，并且访问需要与患者表（“主”模型）具有正确的外键关系。

我在def form_valid文件中收到与views.py命令相关的以下错误。如果我删除此命令，则会收到not null错误，因为该字段需要填写。我也尝试了get_instance功能，但论坛建议不要使用def form_valid。

错误

Cannot assign "<SimpleLazyObject: 
<django.contrib.auth.models.AnonymousUser object at 0x10d62d278>>": 
"Visit.fk_visit_user" must be a "User" instance.
 Request Method:    POST
Request URL:    http://127.0.0.1:8000/clincher/visit/add/2
Django Version: 2.0.4
Exception Type: ValueError
Exception Value:    
Cannot assign "<SimpleLazyObject: <django.contrib.auth.models.AnonymousUser object at 0x10d62d278>>": "Visit.fk_visit_user" must be a "User" instance.
Exception Location: /Users/nrsmoll/venv/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py in __set__, line 197
Python Executable:  /Users/nrsmoll/venv/bin/python
Python Version: 3.6.4
Python Path:    
['/Users/nrsmoll/PycharmProjects/clincher',
 '/Users/nrsmoll/PycharmProjects/clincher',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload',
 '/Users/nrsmoll/venv/lib/python3.6/site-packages',
 '/Users/nrsmoll/venv/lib/python3.6/site-packages/setuptools-28.8.0-py3.6.egg',
 '/Users/nrsmoll/venv/lib/python3.6/site-packages/pip-9.0.1-py3.6.egg',
 '/Applications/PyCharm.app/Contents/helpers/pycharm_matplotlib_backend']
Server time:    Wed, 6 Jun 2018 13:16:29 +0000

回溯

Environment:
Request Method: POST
Request URL: http://127.0.0.1:8000/clincher/visit/add/2

Django Version: 2.0.4
Python Version: 3.6.4
Installed Applications:
['clincher.apps.clincherConfig',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback:

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  35.             response = get_response(request)

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  128.                 response = self.process_exception_by_middleware(e, request)

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  126.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/views/generic/base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/views/generic/base.py" in dispatch
  89.         return handler(request, *args, **kwargs)

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/views/generic/edit.py" in post
  172.         return super().post(request, *args, **kwargs)

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/views/generic/edit.py" in post
  142.             return self.form_valid(form)

File "/Users/nrsmoll/PycharmProjects/clincher/clincher/views.py" in form_valid
  63.         form.instance.fk_visit_user = self.request.user

File "/Users/nrsmoll/venv/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py" in __set__
  197.                     self.field.remote_field.model._meta.object_name,

Exception Type: ValueError at /clincher/visit/add/2
Exception Value: Cannot assign "<SimpleLazyObject: 
<django.contrib.auth.models.AnonymousUser object at 0x10d62d278>>": 
"Visit.fk_visit_user" must be a "User" instance.

的 Models.py

from django.db import models
from django.urls import reverse
from django.contrib.auth.models import User


class Main(models.Model):
    name = models.CharField(max_length = 256)
    date_of_birth = models.CharField(max_length = 256)
    age = models.CharField(max_length=4)

    def get_absolute_url(self):
        return reverse('clincher:main-detail', kwargs={'pk': self.pk})

    def __str__(self):
        return self.name + ' - ' + self.date_of_birth


class Visit(models.Model):
     fk_visit_main = models.ForeignKey(Main, on_delete=models.CASCADE, verbose_name=('Patient Name'))
    visit_date = models.DateField(auto_now = True, editable=True)
    fk_visit_user = models.ForeignKey(User, on_delete=models.PROTECT, verbose_name=('Practitioner'), max_length=500)

def __str__(self):
    return '%s %s' % (self.visit_date, self.visit_label)

def get_absolute_url(self):
    return reverse('clincher:main-detail', kwargs={'pk': self.pk})

Views.py

class VisitCreate(CreateView):
    model = Visit
    fields = [ 'visit_label', 'visit_type', 'visit_progress_notes']

    def form_valid(self, form):
        form.instance.fk_visit_user = self.request.user **Error Here**
        form.instance.main_id = self.kwargs['pk']
        return super(VisitCreate, self).form_valid(form)

    def get_success_url(self):
        return reverse('clincher:main-detail', args={'pk': self.object.id})

基本上，我需要有一个维持父子关系的表单，如果有更好的方式或更有效的方式，请告诉我。

Answer 1

如错误所示，您正在尝试将AnonymousUser分配给该对象。这是因为访问您网页的用户未登录。您需要使用视图上的LoginRequired mixin来确保他们已登录。

Django：将外键添加到表单 - ＆gt;无法分配“<simplelazyobject：，must =”“be =”“a =”“”user“=”“instance =”“

1 个答案: