AttributeError: 'Post' object has no attribute 'get_absolute_url'

Below is the code of views.py. I am getting error when calling   HttpResponseRedirect in update and create method. So please let me know   how can i solve this ?

from django.shortcuts import render, get_object_or_404  from django.http import HttpResponse, HttpResponseRedirect    from .forms import PostForm  from . models import Post    def post_create(request): #create Method      form = PostForm(request.POST or None)      if form.is_valid():          instance = form.save(commit=False)          instance.save()          return HttpResponseRedirect(instance.get_absolute_url())        context = {      "form" : form,      }      return render(request, "post_form.html", context)  def post_list(request): #list method      queryset = Post.objects.all()      context = {      "object_list": queryset,      "title": "List"      }      return render(request, "index.html", context)    def post_update(request, id=None): #update Method      instance = get_object_or_404(Post, id=id)      form = PostForm(request.POST or None, instance=instance)      if form.is_valid():          instance = form.save(commit=False)          instance.save()          return HttpResponseRedirect(instance.get_absolute_url()) #i am getting error here        context = {          "title": instance.title,          "instance": instance,          "form": form,      }      return render(request, "post_form.html", context)

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