Add a CSV export functionality in admin and add price fields (#41)

* Implement an action do download data in csv
* Refactor CSV download
* Move price to main models and add csv to bookshelf
* Update template and API
* Small refactoring

ram/bookshelf/views.py

@@ -1,8 +1,8 @@
 from rest_framework.generics import ListAPIView, RetrieveAPIView
 from rest_framework.schemas.openapi import AutoSchema
 
-from bookshelf.models import Book
-from bookshelf.serializers import BookSerializer
+from bookshelf.models import Book, Catalog
+from bookshelf.serializers import BookSerializer, CatalogSerializer
 
 
 class BookList(ListAPIView):
@@ -19,3 +19,19 @@ class BookGet(RetrieveAPIView):
 
     def get_queryset(self):
         return Book.objects.get_published(self.request.user)
+
+
+class CatalogList(ListAPIView):
+    serializer_class = CatalogSerializer
+
+    def get_queryset(self):
+        return Catalog.objects.get_published(self.request.user)
+
+
+class CatalogGet(RetrieveAPIView):
+    serializer_class = CatalogSerializer
+    lookup_field = "uuid"
+    schema = AutoSchema(operation_id_base="retrieveCatalogByUUID")
+
+    def get_queryset(self):
+        return Book.objects.get_published(self.request.user)