From e983d01a83a30cf6f73e35a5f8d383b41d716147 Mon Sep 17 00:00:00 2001
From: Hyungi Ahn <hyungiahn@Hyungiui-MacBookPro.local>
Date: Wed, 3 Sep 2025 18:35:50 +0900
Subject: [PATCH] =?UTF-8?q?Fix:=20PDF=20=EB=A7=A4=EC=B9=AD=20=EB=93=9C?=
 =?UTF-8?q?=EB=A1=AD=EB=8B=A4=EC=9A=B4=20=EA=B0=92=20=EB=B0=94=EC=9D=B8?=
 =?UTF-8?q?=EB=94=A9=20=EB=AC=B8=EC=A0=9C=20=ED=95=B4=EA=B2=B0?=
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- Alpine.js에서 :value="null"이 문자열로 변환되는 문제 수정
- option value를 빈 문자열("")로 변경
- JavaScript에서 null 값을 빈 문자열로 변환하여 UI 바인딩 개선
- 저장 시 빈 문자열과 null 모두 처리하도록 수정
---
 frontend/book-editor.html         | 2 +-
 frontend/static/js/book-editor.js | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/frontend/book-editor.html b/frontend/book-editor.html
index a065216..6a86ed6 100644
--- a/frontend/book-editor.html
+++ b/frontend/book-editor.html
@@ -150,7 +150,7 @@
                                             <select x-model="doc.matched_pdf_id" 
                                                     :class="doc.matched_pdf_id ? 'border-green-300 bg-green-50' : 'border-gray-300'"
                                                     class="w-full px-3 py-2 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent text-sm">
-                                                <option :value="null">PDF 매칭 없음</option>
+                                                <option value="">PDF 매칭 없음</option>
                                                 <template x-for="pdf in availablePDFs" :key="pdf.id">
                                                     <option :value="pdf.id" x-text="pdf.title"></option>
                                                 </template>
diff --git a/frontend/static/js/book-editor.js b/frontend/static/js/book-editor.js
index 8aa18d1..fd3b423 100644
--- a/frontend/static/js/book-editor.js
+++ b/frontend/static/js/book-editor.js
@@ -95,6 +95,11 @@ window.bookEditorApp = () => ({
                 console.log(`📄 문서 ${index + 1}: ${doc.title}`);
                 console.log(`  - matched_pdf_id: ${doc.matched_pdf_id || 'null'}`);
                 console.log(`  - sort_order: ${doc.sort_order || 'null'}`);
+                
+                // null 값을 빈 문자열로 변환 (UI 바인딩을 위해)
+                if (doc.matched_pdf_id === null) {
+                    doc.matched_pdf_id = "";
+                }
             });
             
             // 사용 가능한 PDF 문서들 로드 (현재 서적의 PDF만)
@@ -237,7 +242,7 @@ window.bookEditorApp = () => ({
                 
                 return window.api.updateDocument(doc.id, {
                     sort_order: doc.sort_order,
-                    matched_pdf_id: doc.matched_pdf_id === "" ? null : doc.matched_pdf_id
+                    matched_pdf_id: doc.matched_pdf_id === "" || doc.matched_pdf_id === null ? null : doc.matched_pdf_id
                 });
             });