feat: add shelve management functionality

internal/mapper/shelve_mapper.go

@@ -0,0 +1,46 @@
+package mapper
+
+import (
+	"wm-backend/internal/models"
+	db "wm-backend/sqlc_gen"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+func ToDomainShelve(r db.Shelf) *models.Shelve {
+	return &models.Shelve{
+		ID:          r.ID,
+		CabinetID:   r.CabinetID,
+		Name:        r.Name,
+		LevelIndex:  r.LevelIndex,
+		Description: r.Description.String,
+		CreatedAt:   r.CreatedAt,
+		UpdatedAt:   r.UpdatedAt,
+	}
+}
+
+func ToModelShelve(r *models.Shelve) *db.CreateShelveParams {
+	return &db.CreateShelveParams{
+		CabinetID:  r.CabinetID,
+		Name:       r.Name,
+		LevelIndex: r.LevelIndex,
+		Description: pgtype.Text{
+			String: r.Description,
+			Valid:  r.Description != "",
+		},
+		CreatedAt: r.CreatedAt,
+	}
+}
+
+func ToUpdateModelShelve(r *models.Shelve) *db.UpdateShelveParams {
+	return &db.UpdateShelveParams{
+		Name:       r.Name,
+		LevelIndex: r.LevelIndex,
+		Description: pgtype.Text{
+			String: r.Description,
+			Valid:  r.Description != "",
+		},
+		UpdatedAt: r.UpdatedAt,
+		ID:        r.ID,
+	}
+}