#399

backend/app/services/post_import_previewer.rb

@@ -22,6 +22,8 @@ class PostImportPreviewer
       tag_sources = row[:tag_sources]&.stringify_keys || initial_tag_sources(attributes, provenance)
       tag_sources['manual'] = attributes['tags'].to_s if provenance['tags'] == 'manual'
       url = row[:url].presence || values[@url_column].to_s.strip
+      url_changed = row[:metadata_url].present? && row[:metadata_url] != url
+      clear_automatic_values!(attributes, provenance, tag_sources) if url_changed
       provenance['url'] ||= row[:url].present? ? 'manual' : 'mapped'
       attributes['url'] = url
       fetch_warnings = Array(row[:fetch_warnings]).dup
@@ -49,11 +51,12 @@ class PostImportPreviewer
         @existing == 'error' ? errors[:url] = ['既存投稿です．'] : validation_warnings << '既存投稿のためスキップします．'
       end
       validate_basic_data(attributes, errors)
-      validate_preview_tags(merged_tags(tag_sources), errors, validation_warnings)
+      validate_preview_tags(merged_tags(tag_sources, provenance['tags']), errors, validation_warnings)
       validate_parents(attributes['parent_post_ids'], errors)
       attributes.delete('url')
-      attributes['tags'] = merged_tags(tag_sources)
+      attributes['tags'] = merged_tags(tag_sources, provenance['tags'])
       { source_row: row[:source_row], url: normal_url || url, attributes:, provenance:, tag_sources:,
+        metadata_url: url,
         fetch_warnings:, validation_warnings:, warnings: fetch_warnings + validation_warnings, errors:,
         status: errors.present? ? 'error' : ((fetch_warnings + validation_warnings).present? ? 'warning' : 'ready'),
         existing: normal_url.present? && Post.exists?(url: normal_url) }
@@ -97,10 +100,19 @@ class PostImportPreviewer
       'fixed' => origin == 'fixed' ? attributes['tags'].to_s : '', 'manual' => '' }
   end
 
-  def merged_tags sources
+  def merged_tags sources, origin = nil
+    return sources['manual'].to_s if origin == 'manual'
+
     %w[automatic mapped fixed manual].flat_map { sources[_1].to_s.split }.uniq.join(' ')
   end
 
+  def clear_automatic_values! attributes, provenance, tag_sources
+    %w[title thumbnail_base original_created_from original_created_before duration].each do |field|
+      attributes[field] = '' if provenance[field] == 'automatic'
+    end
+    tag_sources['automatic'] = ''
+  end
+
   def fetch_metadata url
     return [{ }, ['URL が空です．']] if url.blank?