#399

backend/app/services/post_import_runner.rb

@@ -27,13 +27,24 @@ class PostImportRunner
     return { source_row: row['source_row'],
              status: 'failed',
              errors: preview[:validation_errors] } if preview[:validation_errors].present?
-    return row.slice('source_row').merge(status: 'skipped') if preview[:skip_reason] == 'existing'
+    if preview[:skip_reason] == 'existing'
+      return { source_row: row['source_row'],
+               status: 'skipped',
+               existing_post_id: preview[:existing_post_id] }
+    end
 
     attributes['tags'] = preview[:attributes]['tags']
     attributes['url'] = row['url']
     post = PostCreator.new(actor: @actor, attributes:).create!
     { source_row: row['source_row'], status: 'created', post: PostRepr.base(post) }
   rescue ActiveRecord::RecordInvalid => e
+    existing_post = existing_post_for_race(row, e.record)
+    if existing_post
+      return { source_row: row['source_row'],
+               status: 'skipped',
+               existing_post_id: existing_post.id }
+    end
+
     { source_row: row['source_row'], status: 'failed', errors: e.record.errors.to_hash }
   rescue Tag::NicoTagNormalisationError
     { source_row: row['source_row'],
@@ -54,4 +65,13 @@ class PostImportRunner
       status: 'failed',
       errors: { base: ['登録中にエラーが発生しました．'] } }
   end
+
+  def existing_post_for_race row, record
+    return nil unless record.errors.of_kind?(:url, :taken)
+
+    normal_url = PostUrlNormaliser.normalise(row['url'])
+    return nil if normal_url.blank?
+
+    Post.find_by(url: normal_url)
+  end
 end