Django - 为不同的页面创建一个评论系统，使用一个评论 model

Question

I'm trying to create a website with a page for information about different cities. At the bottom of each page, I want there to be a comment section. My idea is to have a Comment model, which stores all the comments in one place, with each comment object having a field called 'page' which tells me the page they should be displayed on. Then I can just filter through the comments so only the ones for the right page are displayed.

So far I have created a City model which is used by a detail view, CityDetailView, to create a page for each of the cities. This works well and uses a slug for the URLs. I've made a Comment model which accepts: 'content' (describing the city), 'date_posted', 'author' and 'page' which I've connected to the City model through a foreign key. It's my thinking that this 'page' field can be used to store what page the comment was written on, so that I can use {{ if comments.page == cites.name}} or something in my city.html template to display the comments only to the correct page.

Going with this thinking, I'm guessing I would need to make a ListView inside the CityDetailView to list the comments. Is this right? I feel there is a better way to do this so any help would be greatly appreciated.

Here is the relevent code, at the moment, no comments show up for the city pages. I have added these manually through the shell, one for each of the two test pages.

views.py

from django.shortcuts import render
from django.views.generic import DetailView, ListView
from .models import Post, Comment, City, County


def home(request):
    return render(request, 'blog/home.html', {'title':'TIP Home'})   


class CityDetailView(DetailView):
    model = City
    template_name = 'blog/city.html'
    context_object_name = 'cities'

    class CommentsView(ListView):
        model = Comment
        context_object_name = 'comments'

urls.py

from django.urls import path
from . import views 
from .views import CityDetailView, CountyDetailView

urlpatterns = [
    path('', views.home, name='blog-home'),
    path('<slug>/', CityDetailView.as_view(), name='city-detail'),
]

models.py

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User
from django.db.models.signals import pre_save
from django.utils.text import slugify

class City(models.Model):
    title = models.CharField(max_length=100)
    slug = models.SlugField(max_length=250, null=True, blank=True)
    about = models.TextField()

    def __str__(self):
        return self.title

class Comment(models.Model):
    content = models.TextField()
    date_posted = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    page = models.ForeignKey(City, on_delete=models.CASCADE)

    def __str__(self):
        return str(self.author)+'-'+str(self.page)+'-'+str(self.pk)        


def slug_generator(sender, instance, *args, **kwargs):
    if not instance.slug:
        instance.slug = slugify(instance.title)

pre_save.connect(slug_generator, sender=City)

city.html

{% extends "blog/base.html" %}
{% load static %}
{% block content %}
    <div class="page_heading"><h1>{{ cities.title }}</h1></div>
    <p><center>{{ cities.about }}</center></p>


    {% for comment in comments %}

            <article class="media content-section">
              <div class="media-body">
                <div class="article-metadata">
                  <a class="mr-2" href="#">{{ comment.author }}</a>
                  <small class="text-muted">{{ comment.date_posted|date:'Y n d'  }}</small>
                </div>
                <p class="article-content">{{ comment.content }}</p>
              </div>
            </article>

    {% endfor%}


{% endblock content %}

Answer 1

Override the get_context_data and through there get access to all the comments for the appropriate page slug.

class CityDetailView(DetailView):
    model = City
    template_name = 'blog/city.html'
    context_object_name = 'cities'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['comments'] = Comment.objects.get(page_slug=self.kwargs['slug'])

        return context