#399

backend/app/services/post_import_previewer.rb

@@ -4,7 +4,7 @@ class PostImportPreviewer
   def initialize parsed:, url_column:, mappings: { }, existing: 'skip'
     @parsed = parsed
     @url_column = url_column.to_i
-    @mappings = mappings.to_h.stringify_keys
+    @mappings = mappings.stringify_keys
     @existing = existing == 'error' ? 'error' : 'skip'
   end