refactor this feature

apps/account/serializers/common.py

@@ -77,6 +77,23 @@ class UserSerializer(serializers.ModelSerializer):
         return instance
 
 
+class UserBaseSerializer(serializers.ModelSerializer):
+    """Serializer is used to display brief information about the user."""
+
+    fullname = serializers.CharField(source='get_full_name', read_only=True)
+
+    class Meta:
+        """Meta class."""
+
+        model = models.User
+        fields = (
+            'fullname',
+            'cropped_image_url',
+            'image_url',
+        )
+        read_only_fields = fields
+
+
 class ChangePasswordSerializer(serializers.ModelSerializer):
     """Serializer for model User."""
 

apps/news/migrations/0020_remove_news_author.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.2.4 on 2019-10-02 09:18
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('news', '0019_news_author'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='news',
+            name='author',
+        ),
+    ]

apps/news/models.py

@@ -27,10 +27,21 @@ class NewsType(models.Model):
 class NewsQuerySet(models.QuerySet):
     """QuerySet for model News"""
 
+    def with_base_related(self):
+        """Return qs with related objects."""
+        return self.select_related('news_type', 'country').prefetch_related('tags')
+
+    def with_extended_related(self):
+        """Return qs with related objects."""
+        return self.select_related('created_by')
+
     def by_type(self, news_type):
         """Filter News by type"""
         return self.filter(news_type__name=news_type)
 
+    def by_tags(self, tags):
+        return self.filter(tags__in=tags)
+
     def by_country_code(self, code):
         """Filter collection by country code."""
         return self.filter(country__code=code)
@@ -42,9 +53,16 @@ class NewsQuerySet(models.QuerySet):
                                     models.Q(end__isnull=True)),
                            state__in=self.model.PUBLISHED_STATES, start__lte=now)
 
-    def with_related(self):
-        """Return qs with related objects."""
-        return self.select_related('news_type', 'country').prefetch_related('tags')
+    # todo: filter by best score
+    # todo: filter by country?
+    def should_read(self, news):
+        return self.model.objects.exclude(pk=news.pk).published().\
+            with_base_related().by_type(news.news_type).distinct().order_by('?')
+
+    def same_theme(self, news):
+        return self.model.objects.exclude(pk=news.pk).published().\
+            with_base_related().by_type(news.news_type).\
+            by_tags(news.tags.all()).distinct().order_by('-start')
 
 
 class News(BaseAttributes, TranslatedFieldsMixin):
@@ -95,15 +113,8 @@ class News(BaseAttributes, TranslatedFieldsMixin):
     slug = models.SlugField(unique=True, max_length=50,
                             verbose_name=_('News slug'))
     playlist = models.IntegerField(_('playlist'))
-
-    # author = models.CharField(max_length=255, blank=True, null=True,
-    #                           default=None,verbose_name=_('Author'))
-
     state = models.PositiveSmallIntegerField(default=WAITING, choices=STATE_CHOICES,
                                              verbose_name=_('State'))
-    author = models.CharField(max_length=255, blank=True, null=True,
-                              default=None,verbose_name=_('Author'))
-
     is_highlighted = models.BooleanField(default=False,
                                          verbose_name=_('Is highlighted'))
     # TODO: metadata_keys - описание ключей для динамического построения полей метаданных
@@ -141,54 +152,10 @@ class News(BaseAttributes, TranslatedFieldsMixin):
         return reverse('web:news:rud', kwargs={'slug': self.slug})
 
     @property
-    def list_also_like_news(self):
-
-        # without "distinct" method the doubles are arising
-        like_news = News.objects.published().filter(news_type=self.news_type, tags__in=models.F("tags"))\
-            .exclude(id=self.id).distinct()
-
-        news_count = like_news.count()
-
-        if news_count >= 6:
-            random_ids = random_sample(range(news_count), 6)
-        else:
-            random_ids = random_sample(range(news_count), news_count)
-
-        news_list = [{"id": like_news[r].id, "slug": like_news[r].slug} for r in random_ids]
-
-        return news_list
+    def should_read(self):
+        return self.__class__.objects.should_read(self)[:3]
 
     @property
     def same_theme(self):
-        # on the same theme news
+        return self.__class__.objects.same_theme(self)[:3]
 
-        # without "distinct" method the doubles are arising
-        like_news = News.objects.published().filter(news_type=self.news_type, tags__in=models.F("tags"))\
-            .order_by("-start").exclude(id=self.id).distinct()
-
-        news_count = like_news.count()
-
-        if news_count >= 3:
-            like_news = like_news[:3]
-
-        news_list = [{"id": n.id, "slug": n.slug} for n in like_news]
-
-        return news_list
-
-    @property
-    def should_read(self):
-        # you should read news
-
-        # without "distinct" method the doubles are arising
-        like_news = News.objects.published().filter(news_type=self.news_type).exclude(id=self.id).distinct()
-
-        news_count = like_news.count()
-
-        if news_count >= 3:
-            random_ids = random_sample(range(news_count), 3)
-        else:
-            random_ids = random_sample(range(news_count), news_count)
-
-        news_list = [{"id": like_news[r].id, "slug": like_news[r].slug} for r in random_ids]
-
-        return news_list

apps/news/serializers.py

@@ -1,6 +1,6 @@
 """News app common serializers."""
 from rest_framework import serializers
-from account.serializers.common import UserSerializer
+from account.serializers.common import UserBaseSerializer
 from location import models as location_models
 from location.serializers import CountrySimpleSerializer
 from main.serializers import MetaDataContentSerializer
@@ -51,8 +51,7 @@ class NewsDetailSerializer(NewsBaseSerializer):
 
     description_translated = TranslatedField()
     country = CountrySimpleSerializer(read_only=True)
-    # todo: check the data redundancy
-    author = UserSerializer(source='created_by', read_only=True)
+    author = UserBaseSerializer(source='created_by', read_only=True)
     state_display = serializers.CharField(source='get_state_display',
                                           read_only=True)
 
@@ -69,6 +68,19 @@ class NewsDetailSerializer(NewsBaseSerializer):
             'state_display',
             'author',
             'country',
+        )
+
+
+class NewsDetailWebSerializer(NewsDetailSerializer):
+    """News detail serializer for web users.."""
+
+    same_theme = NewsBaseSerializer(many=True, read_only=True)
+    should_read = NewsBaseSerializer(many=True, read_only=True)
+
+    class Meta(NewsDetailSerializer.Meta):
+        """Meta class."""
+
+        fields = NewsDetailSerializer.Meta.fields + (
             'same_theme',
             'should_read',
         )

apps/news/views.py

@@ -11,7 +11,7 @@ class NewsMixinView:
 
     def get_queryset(self, *args, **kwargs):
         """Override get_queryset method."""
-        qs = models.News.objects.with_related().published()\
+        qs = models.News.objects.published().with_base_related()\
             .order_by('-is_highlighted', '-created')
         if self.request.country_code:
             qs = qs.by_country_code(self.request.country_code)
@@ -28,7 +28,11 @@ class NewsDetailView(NewsMixinView, generics.RetrieveAPIView):
     """News detail view."""
 
     lookup_field = 'slug'
-    serializer_class = serializers.NewsDetailSerializer
+    serializer_class = serializers.NewsDetailWebSerializer
+
+    def get_queryset(self):
+        """Override get_queryset method."""
+        return super().get_queryset().with_extended_related()
 
 
 class NewsTypeListView(generics.ListAPIView):
@@ -44,7 +48,7 @@ class NewsBackOfficeMixinView:
     """News back office mixin view."""
 
     permission_classes = (permissions.IsAuthenticated,)
-    queryset = models.News.objects.with_related() \
+    queryset = models.News.objects.with_base_related() \
         .order_by('-is_highlighted', '-created')
 
 
@@ -61,6 +65,10 @@ class NewsBackOfficeLCView(NewsBackOfficeMixinView,
             return self.create_serializers_class
         return super().get_serializer_class()
 
+    def get_queryset(self):
+        """Override get_queryset method."""
+        return super().get_queryset().with_extended_related()
+
 
 class NewsBackOfficeRUDView(NewsBackOfficeMixinView,
                             generics.RetrieveUpdateDestroyAPIView):