switch namespaces from tags to relations with auto-creation

db/rel.go

@@ -32,3 +32,15 @@ func (db *DB) GetRelated(id string, r models.RelType) ([]string, error) {
 func (db *DB) GetIncomingRels(id string, r models.RelType) ([]string, error) {
 	return getIDs(db, "SELECT from_id FROM rels WHERE to_id = ? AND rel_type = ?", id, r)
 }
+
+func (db *DB) GetRelNames(n *models.Node, r models.RelType) ([]string, error) {
+	result := make([]string, 0, len(n.Relations[string(r)]))
+	for _, id := range n.Relations[string(r)] {
+		node, err := db.NodeByID(id)
+		if err != nil {
+			return nil, err
+		}
+		result = append(result, node.Title)
+	}
+	return result, nil
+}