Initial commit

internal/lms/domain/id.go

@@ -0,0 +1,9 @@
+package domain
+
+import (
+	"errors"
+)
+
+var (
+	ErrInvalidID = errors.New("invalid uuid")
+)

internal/lms/domain/order.go

@@ -0,0 +1,42 @@
+package domain
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/google/uuid"
+)
+
+var (
+	ErrOrderAlreadyExist = errors.New("order already exist")
+	ErrOrderNotFound     = errors.New("order not found")
+	ErrInvalidOrderData  = errors.New("invalid order data")
+)
+
+type Order struct {
+	ID       uuid.UUID `db:"id"       json:"id"       validate:"required"`
+	Item     string    `db:"item"     json:"item"     validate:"required"`
+	Quantity int32     `db:"quantity" json:"quantity" validate:"required,gt=0"`
+}
+
+func NewOrder(id uuid.UUID, item string, quantity int32) (*Order, error) {
+	order := &Order{
+		ID:       id,
+		Item:     item,
+		Quantity: quantity,
+	}
+
+	err := order.Validate()
+	if err != nil {
+		return nil, err
+	}
+
+	return order, nil
+}
+
+func (o *Order) Validate() error {
+	validate := validator.New()
+
+	return fmt.Errorf("%w: %w", ErrInvalidOrderData, validate.Struct(o))
+}