[FIX}: 컬렉션 전체 조회 기능 수정

컬렉션 전체 조회에서 response에 books 데이터 추가

src/main/java/com/independentbooks/domain/collection/dto/response/CreateCollectionResponse.java

@@ -1,10 +1,13 @@
 package com.independentbooks.domain.collection.dto.response;
 
+import com.independentbooks.domain.book.domain.Book;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
+import java.util.List;
+
 @Builder
 @Getter
 @NoArgsConstructor
@@ -14,4 +17,5 @@ public class CreateCollectionResponse {
     private String collection_name;
     private String user_nickname;
     private String description;
+    private List<Book> books;
 }

src/main/java/com/independentbooks/domain/collection/presentation/CollectionController.java

@@ -42,7 +42,7 @@ public ResponseEntity<?> getCollections() {
         CreateCollectionResponse collectionResponse;
         List<CreateCollectionResponse> responses = new ArrayList<>();
         for (Collection c : collections) {
-            collectionResponse = new CreateCollectionResponse(c.getId(), c.getCollection_name(), c.getUser().getNickname(), c.getDescription());
+            collectionResponse = new CreateCollectionResponse(c.getId(), c.getCollection_name(), c.getUser().getNickname(), c.getDescription(), c.getBooks());
             responses.add(collectionResponse);
         }