#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
 

backend/app/services/post_import_runner.rb

@@ -86,11 +86,11 @@ class PostImportRunner
   end
 
   def normalise_row row
-    unless row.is_a?(Hash) || row.is_a?(ActionController::Parameters)
+    unless row.is_a?(Hash)
       raise ArgumentError, '取込行の形式が不正です．'
     end
 
-    normalised = row.to_h.deep_transform_keys { _1.to_s.underscore }
+    normalised = row.deep_transform_keys { _1.to_s.underscore }
     source_row = Integer(normalised['source_row'], exception: false)
     raise ArgumentError, '元行番号が不正です．' if source_row.nil? || source_row <= 0