User constructor should return the correct child class is type is unspecified

lib/User.js

@@ -19,10 +19,13 @@ class User {
 		type = type ?? false;
 
 		let types = [];
-		if (type)
+		let knownType = false;
+		if (type) {
 			types.push(type);
-		else
+			knownType = true;
+		} else {
 			types = [ 'account', 'student', 'parent' ];
+		}
 
 		return (async () => {
 			for (const type of types) {
@@ -43,7 +46,7 @@ class User {
 				const res =
 					await conn.runQuery(sql, [ userId ]);
 
-				if (!res)
+				if (!res.length)
 					continue;
 
 				const record = res[0];
@@ -53,7 +56,14 @@ class User {
 
 				this.type = type;
 
-				return this;
+				if (knownType)
+					return this;
+
+				const className =
+					`${type.substring(0, 1).toUpperCase()}`
+					+ `${type.substring(1)}`;
+
+				return new (require(`./${className}`))(this.id);
 			}
 		})();
 	}