在将我的外键值分配给第一个表单字段值时遇到问题。模型启动是父级，模型团队是子级，具有与启动模型相关的外键，并且startup_name的值必须分配给启动外键字段。但是，团队模型是一个动态字段，其中将多个团队成员插入到模型中，而外键只是一个字段。 我需要帮助以正确完成django编程的新功能
forms.py：
from .models import *
from django import forms
class StartupNameForm (forms.ModelForm):
class Meta:
model = Startup
fields = ['startup_name',]
models.py：
from django.db import models
class Startup (models.Model):
startup_name=models.CharField('Startup Name', max_length = 100, unique = True)
def __str__(self) :
return self.startup_name
class Team (models.Model):
name = models.CharField ( 'Name' , max_length = 100 )
position = models.CharField ( 'Position' , max_length = 100 )
startup = models.ForeignKey(Startup, on_delete = models.CASCADE, to_field = 'startup_name')
def __str__(self):
return self.name
views.py：
def str_dashboard(request) :
return render ( request , 'str_dashboard.html' )
def startup(request):
if request.method == 'POST':
form = StartupNameForm(request.POST)
if form.is_valid():
form.save()
return redirect('str_team')
else:
form = StartupNameForm()
return render(request, 'application/str_name.html', {'form': form})
def team(request, self):
TeamFormset = modelformset_factory(Team, fields = ('name','position'), extra = 1)
if request.method=='POST':
formset = TeamFormset(request.POST)
if formset.is_valid():
instances = formset.save(commit = False)
for instance in instances:
instance.Team.startup = request.session['startup_name']
instance.save()
return redirect('str_dashboard')
else:
formset = TeamFormset ()
return render(request,'application/str_team.html', {'formset':formset})
URLS.py：
from django.urls import path
from . import views
urlpatterns = [
path ( 'str_dashboard/' , views.str_dashboard , name = 'str_dashboard' ) ,
path ( 'application/' , views.startup, name = 'str_name' ) ,
path ( 'application-1/' , views.team, name = 'str_team' ) ,
]
服务器会话：
System check identified no issues (0 silenced).
July 19, 2019 - 18:51:49
Django version 2.1.8, using settings 'sourcing.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
[19/Jul/2019 18:51:53] "GET / HTTP/1.1" 200 718
[19/Jul/2019 18:51:55] "GET /str_login/ HTTP/1.1" 200 2205
[19/Jul/2019 18:52:02] "POST /str_login/ HTTP/1.1" 302 0
[19/Jul/2019 18:52:02] "GET /str_dashboard/ HTTP/1.1" 200 11222
[19/Jul/2019 18:52:05] "GET /application/ HTTP/1.1" 200 1464
[19/Jul/2019 18:52:13] "POST /application/ HTTP/1.1" 302 0
[19/Jul/2019 18:52:14] "GET /application-1/ HTTP/1.1" 200 4687
Internal Server Error: /application-1/
Traceback (most recent call last):
File "C:\Users\Lenovo\venv\lib\site- packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\Lenovo\venv\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Lenovo\venv\lib\site- packages\django\core\handlers\base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Lenovo\PycharmProjects\untitled1\sourcing\startups\views.py", line 30, in team
if formset.is_valid():
File "C:\Users\Lenovo\venv\lib\site- packages\django\forms\formsets.py", line 301, in is_valid
self.errors
File "C:\Users\Lenovo\venv\lib\site- packages\django\forms\formsets.py", line 281, in errors
self.full_clean()
File "C:\Users\Lenovo\venv\lib\site- packages\django\forms\formsets.py", line 322, in full_clean
for i in range(0, self.total_form_count()):
File "C:\Users\Lenovo\venv\lib\site- packages\django\forms\formsets.py", line 110, in total_form_count
return min(self.management_form.cleaned_data[TOTAL_FORM_COUNT], self.absolute_max)
File "C:\Users\Lenovo\venv\lib\site- packages\django\utils\functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\Lenovo\venv\lib\site- packages\django\forms\formsets.py", line 92, in management_form
code='missing_management_form',
django.core.exceptions.ValidationError: ['ManagementForm data is missing or has been tampered with']
[19/Jul/2019 18:52:36] "POST /application-1/ HTTP/1.1" 500 93454
答案 0 :(得分：1)
非常感谢Farhani Walid，他的一切功劳归功于他，他帮助解决了这个问题，我在最终代码集下面发布了该代码集，以供将来遇到相同问题的其他人使用。请注意，在我的情况下，我不必导入会话，但在您的情况下，我建议这样做，以防您的IDE要求
server {
listen 80;
listen [::]:80 default_server;
return 301 https://$host$request_uri;
}
server {
# Enable HTTP/2
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name domain.com;
# Use the Letā€™s Encrypt certificates
ssl_certificate /etc/letsencrypt/live/domain.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/domain.com/privkey.pem;
# Include the SSL configuration from cipherli.st
include snippets/ssl-params.conf;
location /api {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-NginX-Proxy true;
proxy_pass http://localhost:5000;
proxy_ssl_session_reuse off;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_cache_bypass $http_upgrade;
proxy_redirect off;
}
location / {
root /var/www/html/Web/dist; // Vue dist folder
}
}
forms.py：
from django.contrib.sessions.models import Session
models.py：
from .models import *
from django import forms
class StartupNameForm (forms.ModelForm):
class Meta:
model = Startup
fields = ['startup_name',]
views.py：
from django.db import models
class Startup (models.Model):
startup_name=models.CharField('Startup Name', max_length = 100)
def __str__(self) :
return self.startup_name
class Team (models.Model):
name = models.CharField ( 'Name' , max_length = 100 )
position = models.CharField ( 'Position' , max_length = 100 )
startup = models.ForeignKey(Startup, on_delete = models.CASCADE)
def __str__(self):
return self.name
urls.py：
from django.forms import modelformset_factory
from .decorators import str_required
from django.contrib.auth.decorators import login_required
from django.shortcuts import render , redirect
from .forms import *
@login_required ( login_url = 'str_login' )
@str_required
def str_dashboard(request) :
return render ( request , 'str_dashboard.html' )
def startup(request):
if request.method == 'POST':
form = StartupNameForm(request.POST)
if form.is_valid():
saved_startup_object = form.save()
request.session['saved_startup_object'] = saved_startup_object.id
return redirect('str_team')
else:
form = StartupNameForm()
return render(request, 'application/str_name.html', {'form': form})
def team(request):
stored_startup_object = request.session['saved_startup_object']
TeamFormset = modelformset_factory(Team, fields = ('name','position'), extra = 1)
if request.method=='POST':
formset = TeamFormset(request.POST)
if formset.is_valid():
team_startup = None
if stored_startup_object is not None:
team_startup = Startup.objects.get(id=stored_startup_object)
instances = formset.save(commit = False)
for instance in instances:
instance.startup = team_startup
instance.save()
return redirect('str_dashboard')
else:
formset = TeamFormset ()
return render(request,'application/str_team.html', {'formset':formset})
答案 1 :(得分：0)
如果我完全了解您要在此处执行的操作，则要将在第一个视图中创建的startup.id分配为在第二个视图中创建的团队模型的外键，在这种情况下，您可以想要将启动的值从第一个视图传递到第二个视图，并且为了做到这一点，我在那种情况下使用的是会话。 您将启动ID作为变量存储在会话中，并在第二个视图上对其进行解释，不要忘了像这样导入Session：
from django.contrib.sessions.models import Session
您可以从此处的文档获取有关会话的所有必需信息 https://docs.djangoproject.com/en/2.2/topics/http/sessions/
编辑：
尝试像这样更新您的视图，并在服务器日志中提供输出
def startup(request):
if request.method == 'POST':
form = StartupNameForm(request.POST)
if form.is_valid():
saved_startup_object = form.save()
request.session['saved_startup_object'] = saved_startup_object.id
return redirect('str_team')
else:
form = StartupNameForm()
return render(request, 'application/str_name.html', {'form': form})
def team(request):
stored_startup_object = request.session['saved_startup_object']
TeamFormset = modelformset_factory(Team, fields = ('name','position'), extra = 1)
if request.method=='POST':
formset = TeamFormset(request.POST)
if formset.is_valid():
team_startup = None
if stored_startup_object is not None:
team_startup = Startup.objects.get(id=stored_startup_object)
instances = formset.save(commit = False)
for instance in instances:
instance.Team.startup = team_startup
instance.save()
return redirect('str_dashboard')
else:
formset = TeamFormset ()
return render(request,'application/str_team.html', {'formset':formset})