Book: replace BigDecimal price with embedded Money value object

src/main/java/com/ankurm/sdjpa4demo/domain/Book.java

@@ -1,7 +1,6 @@
 package com.ankurm.sdjpa4demo.domain;
 
 import jakarta.persistence.*;
-import java.math.BigDecimal;
 
 @Entity
 public class Book {
@@ -12,14 +11,16 @@ public class Book {
 
     private String title;
 
-    private BigDecimal price;
+    // Money's fields become columns on the book table: amount -> price_amount, currency -> price_currency.
+    @Embedded
+    private Money price;
 
     @ManyToOne(fetch = FetchType.LAZY)
     private Author author;
 
     protected Book() { }
 
-    public Book(String title, BigDecimal price, Author author) {
+    public Book(String title, Money price, Author author) {
         this.title = title;
         this.price = price;
         this.author = author;
@@ -27,7 +28,7 @@ public class Book {
 
     public Long getId() { return id; }
     public String getTitle() { return title; }
-    public BigDecimal getPrice() { return price; }
+    public Money getPrice() { return price; }
     public Author getAuthor() { return author; }
 
     @Override