replace if-cases to annotate

fet2020/posts/managers.py

@@ -1,5 +1,5 @@
 from django.db import models
-from django.db.models import Q, Manager
+from django.db.models import Case, Manager, Q, When
 from django.utils import timezone
 
 from datetime import timedelta
@@ -29,20 +29,18 @@ class PublishedManager(Manager):
 
 class PostManager(PublishedManager, Manager):
     def get_queryset(self):
-        return super().get_queryset().order_by("-public_date")
+        qs = super().get_queryset()
+        qs = qs.annotate(
+            date=Case(
+                When(post_type="N", then="public_date"),
+                When(post_type="E", then="event_start__date"),
+                When(post_type="F", then="event_start__date"),
+            )
+        )
+        return qs.order_by("-date")
 
     def date_sorted_list(self, public=True):
-        post_list = []
-        for post in self.published(public):
-            if post.post_type != "N":
-                post_list.append((post, post.event_start.date()))
-            else:
-                post_list.append((post, post.public_date))
-
-        result = sorted(post_list, key=lambda x: x[1], reverse=True)
-        posts = [x[0] for x in result]
-
-        return posts
+        return self.published(public)
 
     def date_filtered_list(
         self,
@@ -51,37 +49,17 @@ class PostManager(PublishedManager, Manager):
         month=None,
         fet_meeting_only=None,
     ):
-        post_list = []
-        qs = self.published(public)
+        qs_filter = Q()
 
-        if not fet_meeting_only:
-            posts = qs.filter(~Q(post_type="N"))
-        else:
-            posts = qs.filter(post_type="F")
+        if fet_meeting_only:
+            qs_filter &= Q(post_type="F")
 
         if year:
-            posts = posts.filter(event_start__year=year)
+            qs_filter &= Q(date__year=year)
             if month:
-                posts = posts.filter(event_start__month=month)
+                qs_filter &= Q(date__month=month)
 
-        for post in posts:
-            post_list.append((post, post.event_start.date()))
-
-        if not fet_meeting_only:
-            posts = qs.filter(post_type="N")
-
-            if year:
-                posts = posts.filter(public_date__year=year)
-                if month:
-                    posts = posts.filter(public_date__month=month)
-
-            for post in posts:
-                post_list.append((post, post.public_date))
-
-        result = sorted(post_list, key=lambda x: x[1], reverse=True)
-        posts = [x[0] for x in result]
-
-        return posts
+        return self.published(public).filter(qs_filter)
 
     # use for finding tags at homepage - TODO: delete when new design published
     def get_last_months_posts(self, public=True):
@@ -96,22 +74,19 @@ class ArticleManager(PublishedManager, Manager):
     Provide a query set only for "Article"
     regular fet meetings should not be contained in the news stream
     """
+
     def get_queryset(self):
-        qs = super().get_queryset().filter(Q(post_type="E") | Q(post_type="N"))
-        return qs.order_by("-public_date")
+        qs = super().get_queryset().filter(Q(post_type="N") | Q(post_type="E"))
+        qs = qs.annotate(
+            date=Case(
+                When(post_type="N", then="public_date"),
+                When(post_type="E", then="event_start__date"),
+            )
+        )
+        return qs.order_by("-date")
 
     def date_sorted_list(self, public=True):
-        post_list = []
-        for post in self.published(public):
-            if post.post_type != "N":
-                post_list.append((post, post.event_start.date()))
-            else:
-                post_list.append((post, post.public_date))
-
-        result = sorted(post_list, key=lambda x: x[1], reverse=True)
-        posts = [x[0] for x in result]
-
-        return posts
+        return self.published(public)
 
     def pinned(self, public=True):
         return self.published(public).filter(is_pinned=True).first()
@@ -121,21 +96,31 @@ class NewsManager(PublishedManager, Manager):
     """
     Provide a query set only for "News"
     """
+
     def get_queryset(self):
-        return super().get_queryset().filter(post_type="N").order_by("-public_date")
+        qs = super().get_queryset().filter(post_type="N")
+        qs = qs.annotate(
+            date=Case(
+                When(post_type="N", then="public_date"),
+            )
+        )
+        return qs.order_by("-date")
 
 
 class AllEventManager(PublishedManager, Manager):
     """
     Provide a query set for all events ("Event" and "Fet Meeting")
     """
+
     def get_queryset(self):
-        return (
-            super()
-            .get_queryset()
-            .filter(Q(post_type="E") | Q(post_type="F"))
-            .order_by("-event_start")
+        qs = super().get_queryset().filter(Q(post_type="E") | Q(post_type="F"))
+        qs = qs.annotate(
+            date=Case(
+                When(post_type="E", then="event_start__date"),
+                When(post_type="F", then="event_start__date"),
+            )
         )
+        return qs.order_by("-date")
 
     def future_events(self, public=True):
         date_today = timezone.now()
@@ -148,8 +133,15 @@ class EventManager(PublishedManager, Manager):
     Provide a query set only for "Events"
     regular fet meetings should not be contained in the news stream
     """
+
     def get_queryset(self):
-        return super().get_queryset().filter(post_type="E").order_by("-event_start")
+        qs = super().get_queryset().filter(post_type="E")
+        qs = qs.annotate(
+            date=Case(
+                When(post_type="E", then="event_start__date"),
+            )
+        )
+        return qs.order_by("-date")
 
     def future_events(self, public=True):
         date_today = timezone.now()
@@ -166,8 +158,15 @@ class FetMeetingManager(PublishedManager, Manager):
     """
     Provide a query set only for "Fet Meeting"
     """
+
     def get_queryset(self):
-        return super().get_queryset().filter(post_type="F").order_by("-event_start")
+        qs = super().get_queryset().filter(post_type="F")
+        qs = qs.annotate(
+            date=Case(
+                When(post_type="F", then="event_start__date"),
+            )
+        )
+        return qs.order_by("-date")
 
     def future_events(self):
         date_today = timezone.now()

fet2020/posts/views.py

@@ -250,11 +250,7 @@ def __next(post=None, public=True):
     d = post.slug
 
     if post:
-        # TODO: bad implementation but it works!!
-        if post.post_type == "N" or post.post_type == "E":
-            posts = Post.articles.date_sorted_list(public)
-        elif post.post_type == "F":
-            posts = FetMeeting.objects.published(public)
+        posts = Post.objects.date_sorted_list(public).filter(post_type=post.post_type)
 
     if posts:
         for k, v in enumerate(posts):

fet2020/templates/home.html

@@ -12,11 +12,7 @@
             <div class="news-hero-text">
                 <hr>
                 <div class="article-date">
-                    {% if post.post_type != 'N' %}
-                        <p>{{ post.event_start|date:"d. F Y" }}</p>
-                    {% else %}
-                        <p>{{ post.public_date|date:"d. F Y" }}</p>
-                    {% endif %}
+                    <p>{{ post.date|date:"d. F Y" }}</p>
                 </div>
                 <div class="article-title">
                     <h1>{{ post.title|safe }}</h1>

fet2020/templates/posts/partials/_posts_hero.html

@@ -3,12 +3,7 @@
         <div class="news-hero-text">
             <h1>{{ post.title | safe }}</h1>
             <h2>{{ post.subtitle|default_if_none:"&nbsp;" }}</h2>
-            
-            {% if post.post_type != 'N' %}
-                <p>{{ post.event_start|date:"d. F Y" }}</p>
-            {% else %}
-                <p>{{ post.public_date|date:"d. F Y" }}</p>
-            {% endif %}
+            <p>{{ post.date|date:"d. F Y" }}</p>
         </div>
     </div>
 </a>

fet2020/templates/posts/partials/_posts_hero_compact.html

@@ -5,11 +5,7 @@
         </div>
 
         <div class="news-hero-compact-right">
-            {% if post.post_type != 'N' %}
-                <p style="margin-bottom: 0rem;">{{ post.event_start|date:"d. F Y" }}</p>
-            {% else %}
-                <p style="margin-bottom: 0rem;">{{ post.public_date|date:"d. F Y" }}</p>
-            {% endif %}
+            <p style="margin-bottom: 0rem;">{{ post.date|date:"d. F Y" }}</p>
         </div>
     </div>
 </a>

fet2020/templates/posts/show.html

@@ -14,11 +14,7 @@
     <div class="large-article-header-content">
         <div class="center-container">
             <div class="article-date">
-                {% if post.post_type != 'N' %}
-                    <p>{{ post.event_start|date:"d. F Y" }}</p>
-                {% else %}
-                    <p>{{ post.public_date|date:"d. F Y" }}</p>
-                {% endif %}
+                <p>{{ post.date|date:"d. F Y" }}</p>
             </div>
 
             <div class="article-title">

fet2020/templates/posts/tag.html

@@ -7,7 +7,7 @@
 <div class="large-article-header-content">
     <div class="center-container">
           <div class="article-date">
-            <p>{{post.public_date}}</p>
+            <p>{{post.date}}</p>
           </div>
           <div class="article-title">
             <h1>{{post.title | tags_to_url }}</h1>