前提・実現したいこと
Djangoで外部キーを設定してCRUDしたいのですが追加及び更新にてエラーが出力されます。
発生している問題・エラーメッセージ
ValueError at /securitycard/add/ Cannot assign "<django.db.models.query_utils.DeferredAttribute object at 0x1054da320>": "SecurityCardUser.securitycard" must be a "SecurityCard" instance.
該当のソースコード
python
1from django.http import HttpResponse, HttpResponseRedirect 2from django.shortcuts import render 3from django.utils import timezone 4from securitycard.models import SecurityCard, SecurityCardUser, SecurityCardForm 5from django.urls import reverse 6 7# Create your views here. 8def index(request): 9 security_list = SecurityCard.objects.all() 10 context = {'security_list': security_list} 11 return render(request, 'securitycard/index.html', context) 12 13def new(request): 14 return render(request, 'securitycard/new.html') 15 16def add(request): 17 t1 = SecurityCardUser(securitycard=SecurityCard.card_number) 18# t1 = SecurityCardUser() 19# t1.card_number = len(SecurityCard.objects.order_by('-card_number'))+1 20# t1.update_date = timezone.now() 21 t = SecurityCardForm(request.POST, instance=t1) 22 t.save() 23 return HttpResponseRedirect(reverse('index')) 24 25def detail(request, securitycard_id): 26 securitycard = SecurityCard.objects.get(card_number=securitycard_id) 27 context = {'securitycard': securitycard} 28 return render(request, 'securitycard/new.html', context) 29 30def update(request,securitycard_id): 31 t = SecurityCardUser() 32 t1 = SecurityCardForm(request.POST, instance=t) 33 if t1.is_valid(): 34 t=t1.save(commit=False) 35 t.save() 36 return HttpResponseRedirect(reverse('index')) 37 38def delete(request, securitycard_id): 39 t = SecurityCard.objects.get(card_number=securitycard_id) 40 t.delete() 41 return HttpResponseRedirect(reverse('index'))
python
1from django.db import models 2from django.forms import ModelForm 3 4# Create your models here. 5class SecurityCard(models.Model): 6 card_number= models.IntegerField(primary_key = True) 7 8class SecurityCardUser(models.Model): 9 securitycard = models.ForeignKey(SecurityCard, on_delete = models.CASCADE) 10 user_name = models.CharField(max_length = 50) 11 checkout_at = models.CharField(max_length=50) 12 return_at = models.CharField(max_length=50) 13 14#class SecurityCardForm(ModelForm): 15# class Meta: 16# model = SecurityCard 17# fields = ['card_number'] 18 19class SecurityCardForm(ModelForm): 20 class Meta: 21 model = SecurityCardUser 22 fields = ['securitycard','user_name','checkout_at','return_at']
あなたの回答
tips
プレビュー