author is now on separate table

internal/model/author.go

@@ -0,0 +1,9 @@
+package model
+
+import "gorm.io/gorm"
+
+type Author struct {
+	gorm.Model
+	Name        string
+	Description string
+}

internal/model/book.go

@@ -6,8 +6,9 @@ type Book struct {
 	gorm.Model
 	Title     string `json:"title" gorm:"not null"`
 	ISBN      string `json:"isbn"`
-	Author    string `json:"author"`
 	Summary   string `json:"summary"`
+	Author    Author
+	AuthorID  uint
 	AddedBy   User
 	AddedByID uint
 	Cover     StaticFile