Added Subject.getAllSubjects method

lib/Subject.js

@@ -46,6 +46,29 @@ class Subject {
 			return this;
 		})();
 	}
+
+	static async getAllSubjects() {
+		const sql = `
+			select
+				subjectId as id
+			from
+				subject;
+		`;
+
+		const conn = await new DatabaseConnectionPool();
+		const records = await conn.runQuery(sql);
+		conn.close();
+
+		const objectPromises = [];
+
+		records.forEach(record => {
+			objectPromises.push(new Subject(record.id));
+		});
+
+		const objects = await Promise.all(objectPromises);
+
+		return objects;
+	}
 }
 
 module.exports = Subject;