Fix #8: allow users to favorite articles

articles/views.py

@@ -1,7 +1,9 @@
-from django.shortcuts import get_object_or_404
+from django.http.response import Http404
+from django.shortcuts import get_object_or_404, redirect
+from django.conf import settings
 from django.urls import reverse_lazy
 from django.shortcuts import render
-from django.http import HttpResponseRedirect
+from django.http import HttpResponseRedirect, JsonResponse
 from django.contrib.auth.decorators import login_required
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.views.generic.edit import CreateView, UpdateView
@@ -12,7 +14,8 @@
 
 
 def view(req, slug):
-    return render(req, "articles/detail.html")
+    article = get_object_or_404(Article, slug=slug)
+    return render(req, "articles/detail.html", {"article": article})
 
 
 class ListArticle(ListView):
@@ -178,3 +181,40 @@ def form_valid(self, form):
         """
         self.object = form.save(self.request.user)
         return HttpResponseRedirect(self.get_success_url(), status=303)
+
+
+def favorite_article(request, slug):
+    template = "articles/favorite.html"
+    if request.GET.get("mini", None):
+        template = "articles/favorite_mini.html"
+
+    query = Article.objects.annotate(favorited_by__count=Count("favorited_by"))
+    article = get_object_or_404(query, slug=slug)
+
+    favorited = False
+    if request.user.is_authenticated:
+        favorited = request.user.profile.has_favorited(article)
+
+    if request.method == "POST" and request.user.is_authenticated:
+        if favorited:
+            request.user.profile.unfavorite(article)
+        else:
+            request.user.profile.favorite(article)
+        favorited = not favorited
+
+    active_class = "btn-outline-primary"
+    if favorited:
+        active_class = "btn-primary"
+
+    # refresh counts
+    article = get_object_or_404(query, slug=slug)
+
+    return render(
+        request,
+        template,
+        context={
+            "article": article,
+            "active_class": active_class,
+            "favorited": favorited,
+        },
+    )

realworld/settings.py

@@ -117,12 +117,11 @@
 
 USE_TZ = True
 
-
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/3.1/howto/static-files/
 
 STATIC_URL = "/static/"
-STATICFILES_DIRS = []
+STATICFILES_DIRS = ["assets"]
 
 STATIC_ROOT = BASE_DIR / "assets"
 

realworld/urls.py

@@ -24,6 +24,11 @@
     path("", home_views.index, name="index"),
     path("article/<slug:slug>/", articles_views.view, name="article_view"),
     path("article/", articles_views.ListArticle.as_view(), name="article_list"),
+    path(
+        "article/<slug:slug>/favorite/",
+        articles_views.favorite_article,
+        name="article_favorite",
+    ),
     path(
         "editor/<slug:slug>/", articles_views.EditArticle.as_view(), name="article_edit"
     ),

templates/articles/detail.html

@@ -15,10 +15,9 @@ <h1>How to build webapps that scale</h1>
           &nbsp; Follow Eric Simons <span class="counter">(10)</span>
         </button>
         &nbsp;&nbsp;
-        <button class="btn btn-sm btn-outline-primary">
-          <i class="ion-heart"></i>
-          &nbsp; Favorite Post <span class="counter">(29)</span>
-        </button>
+        <turbo-frame
+        id="favorite-{{ article.slug }}"
+        src="{% url 'article_favorite' slug=article.slug %}">
       </div>
     </div>
   </div>
@@ -50,10 +49,9 @@ <h2 id="introducing-ionic">Introducing RealWorld.</h2>
           &nbsp; Follow Eric Simons <span class="counter">(10)</span>
         </button>
         &nbsp;
-        <button class="btn btn-sm btn-outline-primary">
-          <i class="ion-heart"></i>
-          &nbsp; Favorite Post <span class="counter">(29)</span>
-        </button>
+        <turbo-frame
+        id="favorite-{{ article.slug }}"
+        src="{% url 'article_favorite' slug=article.slug %}">
       </div>
     </div>
 

templates/articles/favorite.html

@@ -0,0 +1,33 @@
+<turbo-frame id="favorite-{{ article.slug }}">
+  {% if request.user.is_authenticated %}
+  <form
+    method="POST"
+    action="{% url 'article_favorite' article.slug %}"
+    class="list-inline-item"
+  >
+    {% csrf_token %}
+    <button class="btn btn-sm {{ active_class }}">
+      <i class="ion-heart"></i>
+      {% if favorited %} &nbsp; Unfavorite Post {% else %} &nbsp; Favorite Post
+      {% endif %}
+      <span class="counter">({{ article.favorited_by__count }})</span>
+    </button>
+  </form>
+  {% else %}
+  <a
+    href="{% url 'login' %}?next={{request.path}}"
+    class="btn btn-sm btn-outline-primary"
+    target="_top"
+  >
+    <i class="ion-heart"></i>
+    &nbsp; Favorite Post
+    <span class="counter">({{ article.favorited_by__count }})</span>
+  </a>
+  {% endif %} {% if request.method == 'POST' %}
+  <script>
+    document
+      .querySelectorAll("#favorite-{{article.slug}}")
+      .forEach((e) => e.attributeChangedCallback("src"));
+  </script>
+  {% endif %}
+</turbo-frame>

templates/articles/favorite_mini.html

@@ -0,0 +1,22 @@
+<turbo-frame id="favorite-{{ article.slug }}">
+  {% if request.user.is_authenticated %}
+  <form
+    method="POST"
+    action="{% url 'article_favorite' article.slug %}?mini=true"
+    class="list-inline-item pull-xs-right"
+  >
+    {% csrf_token %}
+    <button class="btn {{ active_class }} btn-sm pull-xs-right">
+      <i class="ion-heart"></i> {{ article.favorited_by__count }}
+    </button>
+  </form>
+  {% else %}
+  <a
+    href="{% url 'login' %}?next={{request.path}}"
+    class="btn btn-sm btn-outline-primary pull-xs-right"
+    target="_top"
+  >
+    <i class="ion-heart"></i> {{ article.favorited_by__count }}
+  </a>
+  {% endif %}
+</turbo-frame>

templates/articles/list.html

@@ -31,9 +31,11 @@
         </a>
         <span class="date">{{ article.created_at }}</span>
       </div>
-      <button class="btn btn-outline-primary btn-sm pull-xs-right">
-        <i class="ion-heart"></i> {{ article.favorited_by__count }}
-      </button>
+      <turbo-frame
+        id="favorite-{{ article.slug }}"
+        src="{% url 'article_favorite' slug=article.slug %}?mini=true"
+      >
+      </turbo-frame>
     </div>
     <a
       href="{% url 'article_view' article.slug %}"
@@ -81,10 +83,5 @@ <h1>{{ article.title }}</h1>
       >
       {% endif %}
     </span>
-    <script>
-      function toTop() {
-        window.scrollTo(0, 0);
-      }
-    </script>
   </div>
 </turbo-frame>

templates/base.html

@@ -18,10 +18,15 @@
     <!-- Import the custom Bootstrap 4 theme from our hosted CDN -->
     <link rel="stylesheet" href="https://demo.productionready.io/main.css" />
     <script
-      src="https://unpkg.com/@hotwired/[email protected].2/dist/turbo.es2017-umd.js"
+      src="https://unpkg.com/@hotwired/[email protected].3/dist/turbo.es2017-umd.js"
       defer
       data-turbo-track="reload"
     ></script>
+    <script>
+      function toTop() {
+        window.scrollTo(0, 0);
+      }
+    </script>
   </head>
   <body>
     <nav class="navbar navbar-light">