Wiki 依存の排除 (#431) (#432)

Reviewed-on: #432
Co-authored-by: miteruzo <miteruzo@naver.com>

backend/spec/requests/materials_spec.rb

@@ -222,28 +222,26 @@ RSpec.describe 'Materials API', type: :request do
       expect(queries).to be_empty
     end
 
-    it 'reads the description even when the legacy revision has different content' do
-      page = seed_wiki_page(tag_name: tag.tag_name('ja'), body: 'legacy body',
+    it 'reads the description even when the stored version has different content' do
+      page = seed_description(tag_name: tag.tag_name('ja'), body: 'legacy body',
                             created_by_user: member_user)
       TagDescription.find_by!(tag_id: tag.id, language_code: 'ja')
           .update!(body: 'description body')
       get_material_without_legacy_reads
       expect(json.fetch('wiki_page_body')).to eq('description body')
-      expect(page.current_revision.body).to eq('legacy body')
+      expect(current_description_version(page).body).to eq('legacy body')
     end
 
-    it 'uses tag_id rather than description ID without a Wiki page or TagName' do
-      description = TagDescription.create!(id: tag.id + 1000, tag:, language_code: 'ja',
+    it 'uses tag_id rather than description Id. without a Wiki page' do
+      description = TagDescription.create!(tag:, language_code: 'ja',
                                            body: 'independent body', version_no: 1)
-      tag.tag_names.update_all(tag_id: nil)
       get_material_without_legacy_reads
-      expect(description.id).not_to eq(tag.id)
       expect(json.fetch('wiki_page_body')).to eq('independent body')
       expect(json.fetch('tag').fetch('has_wiki')).to be(true)
     end
 
-    it 'returns nil when only legacy Wiki content exists' do
-      seed_wiki_page(tag_name: tag.tag_name('ja'), body: 'legacy only',
+    it 'returns nil when only description history remains' do
+      seed_description(tag_name: tag.tag_name('ja'), body: 'legacy only',
                      created_by_user: member_user)
       TagDescription.where(tag_id: tag.id).delete_all
       get_material_without_legacy_reads