fix: Preview placeholders not shown

Author: fsbraun

djangocms_rest/serializers/pages.py

@@ -1,6 +1,7 @@
 from django.db import models
 
 from cms.models import PageContent
+from cms.utils.placeholder import get_declared_placeholders_for_obj
 
 from rest_framework import serializers
 
@@ -132,7 +133,7 @@ def __init__(self, *args, **kwargs):
         self.request = self.context.get("request")
 
     def to_representation(self, page_content: PageContent) -> dict:
-        declared_slots = [placeholder.slot for placeholder in page_content.page.get_declared_placeholders()]
+        declared_slots = [placeholder.slot for placeholder in get_declared_placeholders_for_obj(page_content)]
         placeholders = [
             placeholder for placeholder in page_content.placeholders.all() if placeholder.slot in declared_slots
         ]

djangocms_rest/views.py

@@ -177,7 +177,7 @@ def get(self, request: Request, language: str, path: str = "") -> Response:
 
         try:
             page_content = getattr(page, self.content_getter)(language, fallback=True)
-            if page_content is None:
+            if not page_content:
                 raise PageContent.DoesNotExist()
             serializer = self.serializer_class(page_content, read_only=True, context={"request": request})
             return Response(serializer.data)