6.recomendar posts

mysite/blog/migrations/0003_auto_20211113_1857.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.2.9 on 2021-11-13 18:57
+
+from django.db import migrations
+import taggit.managers
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('taggit', '0003_taggeditem_add_unique_index'),
+        ('blog', '0002_comment'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='comment',
+            options={'ordering': ('-created',)},
+        ),
+        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'),
+        ),
+    ]

mysite/blog/models.py

@@ -2,6 +2,7 @@
 from django.db import models
 from django.urls import reverse
 from django.utils import timezone
+from taggit.managers import TaggableManager
 
 
 class PublishedManager(models.Manager):
@@ -24,6 +25,7 @@ class Post(models.Model):
     status = models.CharField(max_length=10, choices=STATUS_CHOICES, default='draft')
     objects = models.Manager()
     published = PublishedManager()
+    tags = TaggableManager()
 
     def get_absolute_url(self):
         return reverse('blog:post_detail',

mysite/blog/templates/blog/post/detail.html

@@ -13,7 +13,22 @@ <h1> {{ post.title }}</h1>
         <a href="{% url 'blog:post_share' post.id %}">
             Share this post
         </a>
+        <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.foorloop.last %}, {% endif %}
+        {% endfor %}
+        </p>
     </p>
+    <h2>Similar Posts</h2>
+    {% for post in similar_posts %}
+        <p>
+            <a href="{{ post.get_absolute_url }}">{{ post.title }}</a>
+        </p>
+    {% empty %}
+        There is no similar posts yet.
+    {% endfor %}
     {% with comments.count as total_comments %}
     <h2>
         {{ total_comments }} comment{{total_comments|pluralize }}

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

@@ -4,16 +4,27 @@
 
 {% 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 }}
             </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.foorloop.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 %}

mysite/blog/urls.py

@@ -5,8 +5,14 @@
 app_name = 'blog'
 
 urlpatterns = [
-    # path('', views.post_list, name='post_list'),
-    path('', views.PostListView.as_view(), name='post_list'),
+    # Listar todos os posts
+    path('', views.post_list, name='post_list'),
+    # Listar posts baseado num tag
+    path('tag/<slug:tag_slug>/', views.post_list, name='post_list_by_tag'),
+    # path('', views.PostListView.as_view(), name='post_list'),
+    # Detalhe de uma view
     path('<int:year>/<int:month>/<int:day>/<slug:post>/', views.post_detail, name='post_detail'),
+    # Compartilhar view
     path('<int:post_id>/share/', views.post_share, name='post_share')
+
 ]

mysite/blog/views.py

@@ -1,8 +1,9 @@
 from django.core.mail import send_mail
 from django.core.paginator import Paginator, PageNotAnInteger, EmptyPage
-from django.http import HttpResponseRedirect
+from django.db.models import Count
 from django.shortcuts import render, get_object_or_404, redirect
 from django.views.generic import ListView
+from taggit.models import Tag
 
 from mysite.blog.forms import EmailPostForm, CommentForm
 from mysite.blog.models import Post
@@ -15,8 +16,16 @@ class PostListView(ListView):
     template_name = 'blog/post/list.html'  # O padrão é blog/list.html
 
 
-def post_list(request):
+def post_list(request, tag_slug=None):
     object_list = Post.published.all()
+    tag = None
+    if tag_slug:
+        # A seguinte linha retorna o modelo obtido no banco a partir do tag_slug
+        tag = get_object_or_404(Tag, slug=tag_slug)
+        # De todos os posts publicados, filtra segundo a tag (objeto obtido anteriormente)
+        # Filtragem de um modelo baseado em outro
+        object_list = object_list.filter(tags__in=[tag])
+
     paginator = Paginator(object_list, 3)  # tres postagens em cada página
     page = request.GET.get('page')
     try:
@@ -27,7 +36,7 @@ def post_list(request):
     except EmptyPage:
         # Se a página estiver fora fo intervalo, exibe a última página de resultados
         posts = paginator.page(paginator.num_pages)
-    return render(request, 'blog/post/list.html', {'posts': posts})
+    return render(request, 'blog/post/list.html', {'posts': posts, 'page': page, 'tag': tag})
 
 
 def post_detail(request, year, month, day, post):
@@ -49,9 +58,20 @@ def post_detail(request, year, month, day, post):
     else:
         comment_form = CommentForm()
 
+    # Pag. 87
+    # Lista de id de tags do post atual. Ex.: <QuerySet [3, 5]>
+    post_tags_ids = post.tags.values_list('id', flat=True)
+
+    # Lista de postagens semelhantes Ex. :<QuerySet [<Post:  __str__ do model>, <Post: __str__ do model >]>
+    similar_posts = Post.published.filter(tags__in=post_tags_ids).exclude(id=post.id)
+
+    # Lista dos 4 primeiros objetos tipo posts baseado no atributo criado -same_tags-
+    similar_posts = similar_posts.annotate(same_tags=Count('tags')).order_by('-same_tags', '-publish')[:4]
+
     return render(request, 'blog/post/detail.html',
                   {'post': post, 'comments': comments,
-                   'new_comment': new_comment, 'comment_form': comment_form})
+                   'new_comment': new_comment, 'comment_form': comment_form,
+                   'similar_posts': similar_posts})
 
 
 def post_share(request, post_id):

mysite/settings.py

@@ -38,7 +38,8 @@
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
-    'mysite.blog.apps.BlogConfig'
+    'mysite.blog.apps.BlogConfig',
+    'taggit'
 ]
 
 MIDDLEWARE = [

requirements.txt

@@ -0,0 +1,6 @@
+asgiref==3.4.1
+Django==3.2.9
+django-taggit==1.5.1
+python-decouple==3.5
+pytz==2021.3
+sqlparse==0.4.2