#399

backend/app/services/post_import_previewer.rb

@@ -38,7 +38,7 @@ class PostImportPreviewer
     provenance['url'] = 'manual'
     normal_url = normalised_url(url)
     url_for_metadata = normal_url || url
-    existing_post = normal_url.present? && Post.exists?(url: normal_url)
+    existing_post = normal_url.present? ? Post.find_by(url: normal_url) : nil
 
     validation_errors = {}
     validation_errors[:url] = ['URL が不正です．'] if normal_url.blank?
@@ -61,6 +61,8 @@ class PostImportPreviewer
         provenance:,
         tag_sources:,
         metadata_url: url_for_metadata,
+        skip_reason: 'existing',
+        existing_post_id: existing_post.id,
         field_warnings:,
         base_warnings:,
         validation_errors:,
@@ -93,6 +95,8 @@ class PostImportPreviewer
       provenance:,
       tag_sources:,
       metadata_url: url_for_metadata,
+      skip_reason: nil,
+      existing_post_id: nil,
       field_warnings:,
       base_warnings:,
       validation_errors:,
@@ -129,7 +133,9 @@ class PostImportPreviewer
   end
 
   def initial_field_warnings row
-    (row[:field_warnings] || { }).stringify_keys.transform_values { |value| Array(value).map(&:to_s) }
+    (row[:field_warnings] || { })
+      .stringify_keys
+      .transform_values { |value| Array(value).map(&:to_s) }
   end
 
   def initial_base_warnings row
@@ -161,7 +167,9 @@ class PostImportPreviewer
     data = PostMetadataFetcher.fetch(url).stringify_keys.compact
     warnings = { }
     add_field_warning!(warnings, 'title', TITLE_FETCH_WARNING) if data['title'].blank?
-    add_field_warning!(warnings, 'thumbnail_base', THUMBNAIL_FETCH_WARNING) if data['thumbnail_base'].blank?
+    if data['thumbnail_base'].blank?
+      add_field_warning!(warnings, 'thumbnail_base', THUMBNAIL_FETCH_WARNING)
+    end
     { data:, warnings: }
   rescue Preview::UrlSafety::UnsafeUrl,
          Preview::HttpFetcher::FetchFailed,