为什么这个happening<django.db.models.query_utils.DeferredAttribute对象在0x00000256CA7C05E0>

Question

views.py

获取输出中的其他内容，而不是它中存在的值，我正在尝试，但不是简单地回答，请给我一些我认为这样的错误发生在:(instance=Task)中的建议。

from django.shortcuts import render
from django.http import *
from  MYapp.models import *
from .form import *

def venue(request):
  venue_list = Task.objects.all()

  return render(request,'MYapp/venue.html',{'venue_list': venue_list})

def navebar(request):

  return render(request,'MYapp/navebar.html')


def db(request,db_id):
  venues = Task.objects.get(pk=db_id)
  return render(request,'MYapp/db.html',{'venues': venues})

def search(request):
  if request.method =="POST":
      searched = request.POST.get('searched', False)
      Tasks =Task.objects.filter( firstname__contains = searched)
      return render(request,'MYapp/search.html',{'searched':searched, 'Tasks':Tasks})    
  else:
      return render(request,'MYapp/search.html',{})    

def update(request,db_id):
  venues = Task.objects.get(pk=db_id)
  form = TaskForm(request.POST or None, instance=Task)
  return render(request,'MYapp/update.html',{'venues': venues,'form':form})    

Answer 1

分配变量而不是类

 def update(request,db_id):
    venues = Task.objects.get(pk=db_id)
    form = TaskForm(request.POST or None, instance=Task)
    return render(request,'MYapp/update.html',{'venues': 
    venues,'form':form})  

执行此操作

 def update(request,db_id):
    venues = Task.objects.get(pk=db_id)
    form = TaskForm(request.POST or None, instance=venues )
    return render(request,'MYapp/update.html',{'venues': 
    venues,'form':form})