Vfrdtyky

I am new to Django, when I follow the instructions on Django 2 by example by Antonio Mele. I met a problem that I can not look up the detail of every post.

Click on the title of the post to take a look at the detail of a post, I see

I hang around to find inspirations on StackOverflow, seems everyone's problems are so different. Relevant files listed as below
blog/views.py

    def post_detail(request, year, month, day, post):

        post = get_object_or_404(Post, slug=post,

                                       status='published',

                                       publish__year=year,

                                       publish__month=month,

                                       publish__day=day)

        return render(request,

                      'blog/post/detail.html',

                      {'post': post})



class PostListView(ListView):

    queryset = Post.published.all()

    context_object_name = 'posts'

    paginate_by = 3

    template_name = 'blog/post/list.html'

blog/urls.py

urlpatterns = [

    path('', views.PostListView.as_view(), name='post_list'),

    path('<int:year>/<int:month>/<int:day>/<slug:post>/',

         views.post_detail,

         name='post_detail'),

]

blog/templates/blog/post/detail.html

{% extends "blog/base.html" %}



{% block title %}{{ post.title }}{% endblock %}



{% block content %}

  <h1>{{ post.title }}</h1>

  <p class="date">

    Published {{ post.publish }} by {{ post.author }}

  </p>

  {{ post.body|linebreaks }}

{% endblock %}

The developing environment is:


Python 3.6.5
Django 2.1.2

Thank Daniel Roseman

blog/templates/blog/post/list.html

{% extends "blog/base.html" %}



{% block title %}My Blog{% endblock %}



{% block content %}

  <h1>My Blog</h1>

  {% for post in posts %}

    <h2>

      <a href="{{ post.get_absolute_url }}">

        {{ post.title }}

      </a>

    </h2>

    <p class="date">

      Published {{ post.publish }} by {{ post.author }}

    </p>

    {{ post.body|truncatewords:30|linebreaks }}

  {% endfor %}

  {% include "pagination.html" with page=page_obj %}

{% endblock %}

The models.py

class Post(models.Model):

    STATUS_CHOICES = (

        ('draft', 'Draft'),

        ('published', 'Published'),

    )

    title = models.CharField(max_length=250)

    slug = models.SlugField(max_length=250,

                            unique_for_date='publish')

    author = models.ForeignKey(User,

                               on_delete=models.CASCADE,

                               related_name='blog_posts')

    body = models.TextField()

    publish = models.DateTimeField(default=timezone.now)

    created = models.DateTimeField(auto_now_add=True)

    updated = models.DateTimeField(auto_now=True)

    status = models.CharField(max_length=10,

                              choices=STATUS_CHOICES,

                              default='draft')



    objects = models.Manager() # The default manager.

    published = PublishedManager() # Our custom manager.



    class Meta:

        ordering = ('-publish',)



    def __str__(self):

        return self.title



    def get_absolute_url(self):

        return reverse('blog:post_detail',

                       args=[self.publish.year,

                             self.publish.month,

                             self.publish.day,

                             self.slug])

If possible, say as much as possible how it works in plain words, Since I am still confused about the mechanism behind Django.

It's confusing, I change the database server back to sqlite3, and the problem disappeared.