Fix

gateway/core/models/author.go

@@ -15,3 +15,8 @@ type Author struct {
 func (a *Author) Validate(v *validator.Validate) error {
 	return v.Struct(a)
 }
+
+// TableName specifies the table name for the Author model in the database.
+func (Author) TableName() string {
+	return "authors"
+}

gateway/core/repository/author.go

@@ -10,10 +10,7 @@ type AuthorRepository struct {
 	db *gorm.DB
 }
 
-// TableName overrides the table name used by Author to `authors`
-func (r *AuthorRepository) TableName() string {
-	return "author"
-}
+
 
 // NewAuthorRepository creates a new author repository.
 func NewAuthorRepository(db *gorm.DB) *AuthorRepository {