feat(library): enforce single category in admin and include categories in public book serializer

apps/library/serializers.py

@@ -134,6 +134,8 @@ class BookSerializer(serializers.ModelSerializer):
     share_link = serializers.CharField(read_only=True)
     author = serializers.SerializerMethodField()
     author_detail = AuthorSummarySerializer(source='author', read_only=True)
+    categories = CategorySerializer(many=True, read_only=True)
+    category = serializers.SerializerMethodField()
     language = serializers.SlugRelatedField(
         slug_field='code', 
         queryset=Language.objects.all(),
@@ -149,8 +151,8 @@ class BookSerializer(serializers.ModelSerializer):
     class Meta:
         model = Book
         fields = (
-            'id', 'title', 'slug', 'summary', 'summary_title', 'thumbnail', 'slogan',
-            'status', 'pin', 'view_count', 'download_count', 'publisher', 'year_of_publication', 'author', 'author_detail', 'isbn', 'numnber_of_volume',
+            'id', 'title', 'slug', 'summary', 'summary_title', 'description', 'thumbnail', 'slogan',
+            'status', 'pin', 'view_count', 'download_count', 'publisher', 'year_of_publication', 'author', 'author_detail', 'categories', 'category', 'isbn', 'numnber_of_volume',
             'language', 'main_themes', 'notable_works',
             'file_type', 'book_file', 'created_at', 'bookmark', 'user_rate',
             'average_rate', 'share_link'
@@ -159,6 +161,12 @@ class BookSerializer(serializers.ModelSerializer):
     def get_author(self, obj):
         return obj.author.full_name if obj.author_id else None
 
+    def get_category(self, obj):
+        first_cat = obj.categories.filter(status=True).first() or obj.categories.first()
+        if first_cat:
+            return CategorySerializer(first_cat, context=self.context).data
+        return None
+
     def get_bookmark(self, obj):
         """
         Get bookmark information for this book.

apps/library/serializers_admin.py

@@ -253,7 +253,7 @@ class AdminBookDetailSerializer(serializers.ModelSerializer):
         collections = validated_data.pop("collections", [])
         book = super().create(validated_data)
         if categories:
-            book.categories.set(categories)
+            book.categories.set(categories[:1] if len(categories) > 1 else categories)
         if collections:
             book.collections.set(collections)
         return book
@@ -274,7 +274,7 @@ class AdminBookDetailSerializer(serializers.ModelSerializer):
 
         book = super().update(instance, validated_data)
         if categories is not None:
-            book.categories.set(categories)
+            book.categories.set(categories[:1] if len(categories) > 1 else categories)
         if collections is not None:
             book.collections.set(collections)
         return book

apps/library/urls.py

@@ -39,10 +39,11 @@ admin_router.register(r'collections', AdminLibraryCollectionViewSet, basename='a
 admin_router.register(r'dovodi-collections', DovodiAdminLibraryCollectionViewSet, basename='admin-library-dovodi-collections')
 
 dovodi_router = SimpleRouter()
+dovodi_router.register(r'categories', DovodiAdminLibraryCategoryViewSet, basename='dovodi-library-categories')
 dovodi_router.register(r'collections', DovodiAdminLibraryCollectionViewSet, basename='dovodi-library-collections')
 
 # Hide admin viewsets from swagger
-for prefix, viewset, basename in admin_router.registry:
+for prefix, viewset, basename in admin_router.registry + dovodi_router.registry:
     viewset.swagger_schema = None
 
 urlpatterns = [

apps/library/views.py

@@ -120,7 +120,7 @@ class BookListView(ListAPIView):
         return context
 
     def get_queryset(self):
-        queryset = Book.objects.filter(status=True).select_related('author', 'language')
+        queryset = Book.objects.filter(status=True).select_related('author', 'language').prefetch_related('categories')
 
         # Filter by collection if provided
         collection_id = self.request.query_params.get('collection_id')
@@ -226,7 +226,7 @@ class BookDetailView(Gone410ViewMixin, CanonicalSlugViewSetMixin, RetrieveAPIVie
     serializer_class = BookSerializer
     permission_classes = (IsAuthenticated,)
     authentication_classes = [TokenAuthentication]
-    queryset = Book.objects.all()
+    queryset = Book.objects.all().select_related('author').prefetch_related('categories')
     lookup_field = 'slug'
 
     active_field_name = 'status'