Envelope/Backend/Models/Base.go

package Models

import (
	"github.com/gofrs/uuid"
	"gorm.io/gorm"
)

// Base contains common columns for all tables.
type Base struct {
	ID uuid.UUID `gorm:"type:uuid;primary_key;" json:"id"`
}

// BeforeCreate will set a UUID rather than numeric ID.
func (base *Base) BeforeCreate(tx *gorm.DB) error {
	var (
		id  uuid.UUID
		err error
	)

	if !base.ID.IsNil() {
		return nil
	}

	id, err = uuid.NewV4()
	if err != nil {
		return err
	}

	base.ID = id
	return nil
}