Fix language issue with preview links

djangocms_versioning/admin.py

@@ -33,7 +33,7 @@
 from django.utils.encoding import force_str
 from django.utils.html import format_html
 from django.utils.safestring import mark_safe
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext_lazy as _, get_language
 
 from . import conf, versionables
 from .constants import DRAFT, INDICATOR_DESCRIPTIONS, PUBLISHED, VERSION_STATES
@@ -1177,13 +1177,8 @@ def compare_view(self, request, object_id):
             get_cms_setting("CMS_TOOLBAR_URL__DISABLE"): 1,
             get_cms_setting("CMS_TOOLBAR_URL__PERSIST"): 0,
         }
-        v1_preview_url = add_url_parameters(
-            reverse(
-                "admin:cms_placeholder_render_object_preview",
-                args=(v1.content_type_id, v1.object_id),
-            ),
-            **persist_params
-        )
+        v1_preview_url = get_preview_url(v1.content)
+        v1_preview_url = add_url_parameters(v1_preview_url, **persist_params)
         # Get the list of versions for the grouper. This is for use
         # in the dropdown to choose a version.
         version_list = Version.objects.filter_by_content_grouping_values(
@@ -1206,16 +1201,12 @@ def compare_view(self, request, object_id):
                     request, self.model._meta, request.GET["compare_to"]
                 )
             else:
+                v2_preview_url = get_preview_url(v2.content)
+                v2_preview_url = add_url_parameters(v2_preview_url, **persist_params)
                 context.update(
                     {
                         "v2": v2,
-                        "v2_preview_url": add_url_parameters(
-                            reverse(
-                                "admin:cms_placeholder_render_object_preview",
-                                args=(v2.content_type_id, v2.object_id),
-                            ),
-                            **persist_params
-                        ),
+                        "v2_preview_url": add_url_parameters(v2_preview_url, **persist_params),
                     }
                 )
         return TemplateResponse(

djangocms_versioning/cms_menus.py

@@ -94,7 +94,7 @@ def get_nodes(self, request):
 
         # Depending on the toolbar mode, we need to get the correct version.
         # On edit or preview mode: return DRAFT,
-        # if DRAFT does not exists then return PUBLISHED.
+        # if DRAFT does not exist then return PUBLISHED.
         # On public mode: return PUBLISHED.
         if edit_or_preview:
             states = [constants.DRAFT, constants.PUBLISHED]

djangocms_versioning/cms_toolbars.py

@@ -299,7 +299,7 @@ def get_page_content(self, language=None):
         return get_latest_admin_viewable_content(self.page, language=language)
 
     def populate(self):
-        self.page = self.request.current_page or getattr(self.toolbar.obj, "page", None)
+        self.page = self.request.current_page
         self.title = self.get_page_content() if self.page else None
         self.permissions_activated = get_cms_setting("PERMISSION")
 

djangocms_versioning/helpers.py

@@ -15,6 +15,7 @@
 from django.db import models
 from django.template.loader import render_to_string
 from django.utils.encoding import force_str
+from django.utils.translation import get_language
 
 from . import versionables
 from .conf import EMAIL_NOTIFICATIONS_FAIL_SILENTLY
@@ -263,6 +264,9 @@ def get_preview_url(content_obj: models.Model, language: typing.Union[str, None]
     if versionable.preview_url:
         return versionable.preview_url(content_obj)
     if is_editable_model(content_obj.__class__):
+        if not language:
+            # Use language field is content object has one to determine the language
+            language = getattr(content_obj, "language", get_language())
         url = get_object_preview_url(content_obj, language=language)
         # Or else, the standard change view should be used
     else: