added service with base function to get course and event attendees

api/src/services/CourseSerivce.ts

@@ -0,0 +1,51 @@
+import pool from "../db"
+import { Course, CourseAttendee, RawAttendeeRow } from "@app/shared/types/course"
+
+export async function getAllCourses(): Promise<Course[]> {
+    const sql = "SELECT * FROM courses WHERE deleted = false;"
+
+    const res = await pool.query(sql);
+
+    return res;
+}
+
+function buildAttendee(row: RawAttendeeRow): CourseAttendee {
+    return {
+        passed: !!row.passed,
+        attendee_id: row.attendee_id,
+        course_event_id: row.course_event_id,
+        created_at: row.created_at,
+        updated_at: row.updated_at,
+        remarks: row.remarks,
+        attendee_role_id: row.attendee_role_id,
+        
+        role: row.role_id
+            ? {
+                id: row.role_id,
+                name: row.role_name,
+                description: row.role_description,
+                deleted: !!row.role_deleted,
+                created_at: row.role_created_at,
+                updated_at: row.role_updated_at,
+            }
+            : null
+    };
+}
+
+export async function getCourseAttendees(id: number): Promise<CourseAttendee[]> {
+    const sql = `SELECT
+                ca.*,
+                ar.id AS role_id,
+                ar.name AS role_name,
+                ar.description AS role_description,
+                ar.deleted AS role_deleted,
+                ar.created_at AS role_created_at,
+                ar.updated_at AS role_updated_at
+                FROM course_attendees ca
+                LEFT JOIN course_attendee_roles ar ON ar.id = ca.attendee_role_id
+                WHERE ca.course_event_id = ?;`;
+    
+    const res:RawAttendeeRow[] = await pool.query(sql, [id]);
+    
+    return res.map((row) => buildAttendee(row))
+}