Using django-taggit to implement a tagging system

Module03/mysite/blog/migrations/0004_post_tags.py

@@ -0,0 +1,20 @@
+# Generated by Django 4.2.4 on 2023-08-22 14:35
+
+from django.db import migrations
+import taggit.managers
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('taggit', '0005_auto_20220424_2025'),
+        ('blog', '0003_comment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='post',
+            name='tags',
+            field=taggit.managers.TaggableManager(help_text='A comma-separated list of tags.', through='taggit.TaggedItem', to='taggit.Tag', verbose_name='Tags'),
+        ),
+    ]

Module03/mysite/blog/models.py

@@ -2,6 +2,8 @@
 from django.utils import timezone
 from django.contrib.auth.models import User
 from django.urls import reverse
+from taggit.managers import TaggableManager
+
 
 class Post(models.Model):
 
@@ -18,6 +20,8 @@ class Status(models.TextChoices):
     updated = models.DateTimeField(auto_now=True)
     status = models.CharField(max_length=2, choices=Status.choices, default=Status.DRAFT)
 
+    tags = TaggableManager()
+
     class Meta:
         ordering = ['-publish']
         indexes = [

Module03/mysite/blog/templates/blog/post/list.html

@@ -4,17 +4,33 @@
 
 {% block content %}
     <h1>My Blog</h1>
+    {% if tag %}
+        <h2>Posts tagged with "{{ tag.name }}"</h2>
+    {% endif %}
     {% for post in posts %}
         <h2>
         <a href="{{post.get_absolute_url}}">
-        {{ post.title }}
+            {{ post.title }}
         </a>
         </h2>
+
+
+        <p class="tags">
+            Tags:
+            {% for tag in post.tags.all %}
+                <a href="{% url "blog:post_list_by_tag" tag.slug %}">
+                    {{ tag.name }}
+                </a>
+                {% if not forloop.last %}, {% endif %}
+            {% endfor %}
+        </p>
+
+
         <p class="date">
         Published {{ post.publish }} by {{ post.author }}
         </p>
         {{ post.body|truncatewords:30|linebreaks }}
         <hr />
     {% endfor %}
-    {% include "pagination.html" with page=page_obj %}
+    {% include "pagination.html" with page=posts %}
 {% endblock %}

Module03/mysite/blog/urls.py

@@ -4,8 +4,9 @@
 app_name = 'blog'
 
 urlpatterns = [
-    # path('', views.post_list, name='post_list'),
-    path('', views.PostListView.as_view(), name='post_list'),
+    path('', views.post_list, name='post_list'),
+    path('tag/<slug:tag_slug>/', views.post_list, name='post_list_by_tag'),
+    # path('', views.PostListView.as_view(), name='post_list'),
     path('<int:year>/<int:month>/<int:day>/<slug:post>/', views.post_detail, name='post_detail'),
     path('<int:post_id>/share/', views.post_share, name='post_share'),
     path('<int:post_id>/comment/', views.post_comment, name='post_comment'),

Module03/mysite/blog/views.py

@@ -5,28 +5,33 @@
 from .forms import EmailPostForm, CommentForm
 from django.core.mail import send_mail
 from django.views.decorators.http import require_POST
+from taggit.models import Tag
 
-# def post_list(request):
-#     post_list = Post.objects.all()
-#     paginator = Paginator(post_list, 2)
-#     page_number = request.GET.get('page', 1)
+def post_list(request, tag_slug=None):
+    post_list = Post.objects.all()
+    tag = None
+    if tag_slug:
+        tag = get_object_or_404(Tag, slug=tag_slug)
+        post_list = post_list.filter(tags__in=[tag])
 
-#     try:
-#         posts = paginator.page(page_number)
-#     except PageNotAnInteger:
-#         posts = paginator.page(1)
-#     except EmptyPage:
-#         posts = paginator.page(paginator.num_pages)
-#     return render(request, 'blog/post/list.html', {'posts': posts})
+    paginator = Paginator(post_list, 2)
+    page_number = request.GET.get('page', 1)
+    try:
+        posts = paginator.page(page_number)
+    except PageNotAnInteger:
+        posts = paginator.page(1)
+    except EmptyPage:
+        posts = paginator.page(paginator.num_pages)
+    return render(request, 'blog/post/list.html', {'posts': posts, 'tag': tag})
 
-class PostListView(ListView):
-    """
-    Alternative post list view
-    """
-    model = Post
-    context_object_name = 'posts'
-    paginate_by = 3
-    template_name = 'blog/post/list.html'
+# class PostListView(ListView):
+#     """
+#     Alternative post list view
+#     """
+#     model = Post
+#     context_object_name = 'posts'
+#     paginate_by = 3
+#     template_name = 'blog/post/list.html'
 
 def post_detail(request, year, month, day, post):
     post = get_object_or_404(

Module03/mysite/mysite/settings.py

@@ -38,6 +38,7 @@
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'blog.apps.BlogConfig',
+    'taggit',
 ]
 
 MIDDLEWARE = [