Add ability to extract teachers Accounts from Class

lib/Class.js

@@ -27,6 +27,18 @@ class Class {
 	 */
 	name;
 
+	/**
+	 * The ids of the teachers assigned to the class
+	 * @type {Array<string>}
+	 */
+	teacherIds;
+
+	/**
+	 * The teachers assigned to the class
+	 * @type {Array<Account>}
+	 */
+	teachers;
+
 	/**
 	 * @param {string} classID - The id of the class to fetch
 	 */
@@ -42,10 +54,21 @@ class Class {
 				classId = ?;
 		`;
 
+		const teacherIdSQL = `
+			select
+				a.accountId as id
+			from
+				account a
+				join accountClassLink acl using (accountId)
+			where
+				acl.classId = ?;
+
+		`;
+
 		return (async () => {
 			const conn = await new DatabaseConnectionPool();
 			const record = await conn.runQuery(sql, [
-				classId,
+				classId
 			]);
 
 			if (!record.length)
@@ -54,7 +77,19 @@ class Class {
 			for (const [ k, v ] of Object.entries(record[0]))
 				this[k] = v;
 
-			this.subject = await this.getSubject();
+			const ids = await conn.runQuery(teacherIdSQL, [
+				classId
+			]);
+
+			this.teacherIds = ids.map(record => record.id);
+
+			const [ teachers, subject ] = await Promise.all([
+				this.getTeachers(),
+				this.getSubject()
+			]);
+
+			this.teachers = teachers;
+			this.subject = subject;
 
 			return this;
 		})();
@@ -64,17 +99,18 @@ class Class {
 		return new (require('./Subject'))(this.subjectId);
 	}
 
+	async getTeachers() {
+		const teacherPromises = this.teacherIds.map(id => {
+			return new (require('./Account'))(id);
+		});
 
+		return Promise.all(teacherPromises);
 	}
 
 	get tests() {
 
 	}
 
-	get teachers() {
-
-	}
-
 	get students() {
 
 	}