Extract is_export and paginate_by configuration to SpreadsheetExportMixin

wagtail/admin/views/mixins.py

@@ -154,6 +154,15 @@ class SpreadsheetExportMixin:
 
     export_buttons_template_name = "wagtailadmin/shared/export_buttons.html"
 
+    def setup(self, request, *args, **kwargs):
+        super().setup(request, *args, **kwargs)
+        self.is_export = request.GET.get("export") in self.FORMATS
+
+    def get_paginate_by(self, queryset):
+        if self.is_export:
+            return None
+        return super().get_paginate_by(queryset)
+
     def get_filename(self):
         """Gets the base filename for the exported spreadsheet, without extensions"""
         return "spreadsheet-export"

wagtail/admin/views/reports/base.py

@@ -20,9 +20,7 @@ class ReportView(SpreadsheetExportMixin, IndexView):
 
     def get(self, request, *args, **kwargs):
         self.filters, self.object_list = self.get_filtered_queryset()
-        self.is_export = self.request.GET.get("export") in self.FORMATS
         if self.is_export:
-            self.paginate_by = None
             self.object_list = self.decorate_paginated_queryset(self.object_list)
             return self.as_spreadsheet(self.object_list, self.request.GET.get("export"))
         else:

wagtail/contrib/forms/views.py

@@ -165,9 +165,7 @@ class SubmissionsListView(SpreadsheetExportMixin, ListView):
         if not get_forms_for_user(request.user).filter(pk=self.form_page.id).exists():
             raise PermissionDenied
 
-        self.is_export = self.request.GET.get("export") in self.FORMATS
         if self.is_export:
-            self.paginate_by = None
             data_fields = self.form_page.get_data_fields()
             # Set the export fields and the headings for spreadsheet export
             self.list_export = [field for field, label in data_fields]