add methods in Repository an dModel for importing data

kontor-gin/internal/models/book_author.go

@@ -31,6 +31,19 @@ type BookAuthorDTO struct {
 	AuthorID  *string            `json:"author_id"`
 }
 
+func (dto BookAuthorDTO) ConvertDTOToModel() BookAuthor {
+	model := BookAuthor{
+		ID:        dto.ID,
+		CreatedAt: dto.CreatedAt.Time,
+		UpdatedAt: dto.UpdatedAt.Time,
+		DeletedAt: dto.DeletedAt,
+		Version:   dto.Version,
+		BookID:    dto.BookID,
+		AuthorID:  dto.AuthorID,
+	}
+	return model
+}
+
 func ConvertBookAuthorsToDtos(book_authors []BookAuthor) []BookAuthorDTO {
 	dtos := make([]BookAuthorDTO, len(book_authors))
 	for i, book_author := range book_authors {