add methods in Repository an dModel for importing data

kontor-gin/internal/models/mail.go

@@ -35,6 +35,22 @@ type MailDTO struct {
 	ReceivedAt time.Time          `json:"received_date"`
 }
 
+func (dto MailDTO) ConvertDTOToModel() Mail {
+	model := Mail{
+		ID:         dto.ID,
+		CreatedAt:  dto.CreatedAt.Time,
+		UpdatedAt:  dto.UpdatedAt.Time,
+		DeletedAt:  dto.DeletedAt,
+		Version:    dto.Version,
+		Folder:     dto.Folder,
+		Subject:    dto.Subject,
+		Body:       dto.Body,
+		SendAt:     dto.SendAt,
+		ReceivedAt: dto.ReceivedAt,
+	}
+	return model
+}
+
 func ConvertMailsToDtos(mails []Mail) []MailDTO {
 	dtos := make([]MailDTO, len(mails))
 	for i, mail := range mails {