#6 Refactor: wineClass와 필수 관계 설정

- WineClass에 cascadeType.All과 orphanRemoval = true 설정
- WineClassBookMark의 member와 wineClass에 nullable = flase 설정

src/main/java/com/drinkeg/drinkeg/domain/WineClass.java

@@ -1,14 +1,14 @@
 package com.drinkeg.drinkeg.domain;
 
-import jakarta.persistence.Entity;
-import jakarta.persistence.GeneratedValue;
-import jakarta.persistence.GenerationType;
-import jakarta.persistence.Id;
+import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Entity
 @Getter
 @Builder
@@ -26,6 +26,9 @@ public class WineClass {
 
     private String description;
 
+    @OneToMany(mappedBy = "wineClass", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<WineClassBookMark> bookmarks = new ArrayList<>();
+
     public WineClass updateTitle(String title) {
         this.title = title;
         return this;

src/main/java/com/drinkeg/drinkeg/domain/WineClassBookMark.java

@@ -20,10 +20,10 @@ public class WineClassBookMark {
     private Long id;
 
     @ManyToOne(fetch = LAZY)
-    @JoinColumn(name = "member_id")
+    @JoinColumn(name = "member_id", nullable = false)
     private Member member;
 
     @ManyToOne(fetch = LAZY)
-    @JoinColumn(name = "wine_class_id")
+    @JoinColumn(name = "wine_class_id", nullable = false)
     private WineClass wineClass;
 }