Add Tags and navigation through tags

Allows user to pick or create Tags in the admin, The user can then apply these Tags to blog posts. Clicking on a Tag will link to a page with allposts of said tag. Closes issue Djenesis#56.

contributr/contriblog/admin.py

@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from .models import Post
+from .models import *
 
 
 class PostAdmin(admin.ModelAdmin):
@@ -9,3 +9,4 @@ class PostAdmin(admin.ModelAdmin):
 
 
 admin.site.register(Post, PostAdmin)
+admin.site.register(Tag)

contributr/contriblog/migrations/0002_auto_20150924_1705.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contriblog', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Tag',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('slug', models.SlugField(unique=True, max_length=200)),
+            ],
+        ),
+        migrations.AddField(
+            model_name='post',
+            name='tags',
+            field=models.ManyToManyField(to='contriblog.Tag'),
+        ),
+    ]

contributr/contriblog/models.py

@@ -2,6 +2,12 @@
 
 from django.core.urlresolvers import reverse
 
+# Tag class
+class Tag(models.Model):
+    slug = models.SlugField(max_length=200, unique=True)
+
+    def __str__(self):
+        return self.slug
 
 # Custom queryset manager that only displays posts that have publish set to true.
 class PostQuerySet(models.QuerySet):
@@ -18,6 +24,7 @@ class Post(models.Model):
     edited_date = models.DateTimeField(auto_now=True)
     publish = models.BooleanField(default=False)
     slug = models.SlugField(max_length=200, unique=True)
+    tags = models.ManyToManyField(Tag)
 
     objects = PostQuerySet.as_manager()
 

contributr/contriblog/templates/contriblog/detail.html

@@ -9,8 +9,16 @@
     <div class="page-header">
       <h1>{{ object.title }}</h1>
     </div>
-    <p class="text-muted">created on {{ object.created_date|date }}, by {{ object.author }}</p>
+
+    <p class="text-muted">
+        created on {{ object.created_date|date }}, by {{ object.author }} | Tagged under
+        {% for tag in object.tags.all %}
+            <a href="{% url "blog:tag_detail" tag=tag.slug %}">{{ tag.slug }}</a>{% if not forloop.last %},{% endif %}
+        {% endfor %}
+    </p>
+
     <p>{{ object.body|markdown }}</p>
+
   </div>
 </div>
 {% endblock %}

contributr/contriblog/templates/contriblog/index.html

@@ -11,7 +11,13 @@ <h1>Contributr blog</h1>
     </div>
   {% for object in object_list %}
     <h3><a href="{% url "blog:detail" slug=object.slug %}">{{ object.title }}</a></h3>
-    <p class="text-muted">created on {{ object.created_date|date }}, by {{ object.author }}</p>
+
+    <p class="text-muted">
+        created on {{ object.created_date|date }}, by {{ object.author }} | Tagged under
+        {% for tag in object.tags.all %}
+            <a href="{% url "blog:tag_detail" tag=tag.slug %}">{{ tag.slug }}</a>{% if not forloop.last %},{% endif %}
+        {% endfor %}
+    </p>
 
     <p>{{ object.body|markdown }}</p>
   </div>

contributr/contriblog/templates/contriblog/tag.html

@@ -0,0 +1,11 @@
+{% extends "base.html" %}
+{% block content %}
+  <div class="post">
+    <h2>Tagged under {{ object.slug }}</h2>
+    <ul>
+      {% for entry in object.post_set.all %}
+        <li><a href="{{ entry.get_absolute_url }}">{{ entry.title }}</a></li>
+      {% endfor %}
+    </ul>
+  </div>
+{% endblock %}

contributr/contriblog/urls.py

@@ -5,5 +5,6 @@
 
 urlpatterns = [
     url(r'^$', views.BlogIndex.as_view(), name="index"),
+    url(r'^tags/(?P<tag>\S+)$', views.TagDetail.as_view(), name="tag_detail"),
     url(r'^post/(?P<slug>\S+)$', views.BlogDetail.as_view(), name="detail"),
     ]

contributr/contriblog/views.py

@@ -13,3 +13,9 @@ class BlogIndex(generic.ListView):
 class BlogDetail(generic.DetailView):
     model = models.Post
     template_name = "contriblog/detail.html"
+
+# Generic view that lists every post with selected tag.
+class TagDetail(generic.DetailView):
+    model = models.Tag
+    template_name = "contriblog/tag.html"
+    slug_url_kwarg = "tag"