fix handling of string slices

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

management/internals/network_map_db/pgsql/dns.go

@@ -0,0 +1,42 @@
+package networkmap_pgsql
+
+import (
+	"context"
+	"reflect"
+
+	"github.com/jackc/pgx/v5"
+	networkmapdb "github.com/netbirdio/netbird/management/internals/network_map_db"
+	"github.com/netbirdio/netbird/shared/management/networkmap/nmdata"
+)
+
+const (
+	GetCustomZonesQuery = `
+	select id, public_id, name, description, name_servers, groups, "primary", domains, enabled, search_domains_enabled
+	from name_server_groups
+	where account_id=$1
+	`
+)
+
+func (pg *PgStore) GetCustomZones(ctx context.Context, accountId string) ([]nmdata.NameServerGroup, error) {
+	rows, err := pg.pool.Query(ctx, GetNameserversQuery, accountId)
+	if err != nil {
+		return nil, err
+	}
+
+	nsgroups, err := pgx.CollectRows(rows, pgx.RowToStructByName[nameserverGroup])
+	if err != nil {
+		return nil, err
+	}
+
+	toret := make([]nmdata.NameServerGroup, 0, len(nsgroups))
+	for _, nsg := range nsgroups {
+		group := nmdata.NameServerGroup{}
+		err := networkmapdb.FromSqlTypesToSharedTypes(
+			reflect.ValueOf(&nsg), reflect.ValueOf(&group))
+		if err != nil {
+			return nil, err
+		}
+		toret = append(toret, group)
+	}
+	return toret, nil
+}