[hw-8] add: repo layer

comments/internal/domain/model/comment.go

@@ -0,0 +1,22 @@
+package model
+
+import (
+	"fmt"
+	"time"
+)
+
+type Comment struct {
+	ID        int64 `validate:"gt=0"`
+	UserID    int64 `validate:"gt=0"`
+	SKU       int64 `validate:"gt=0"`
+	CreatedAt time.Time
+	Text      string `validate:"lte=255,gt=0"`
+}
+
+func (c *Comment) Validate() error {
+	if err := validate.Struct(c); err != nil {
+		return fmt.Errorf("invalid requested values: %w", err)
+	}
+
+	return nil
+}

comments/internal/domain/model/errors.go

@@ -0,0 +1,5 @@
+package model
+
+import "errors"
+
+var ErrCommentNotFound = errors.New("comment not found")

comments/internal/domain/model/validate.go

@@ -0,0 +1,9 @@
+package model
+
+import "github.com/go-playground/validator/v10"
+
+var validate *validator.Validate
+
+func init() {
+	validate = validator.New()
+}