Continued creating the entity system

src/utils/exams.be.ts

@@ -1,5 +1,5 @@
 import {collection, getDocs, query, where, setDoc, doc, Firestore, getDoc, and} from "firebase/firestore";
-import {shuffle} from "lodash";
+import {groupBy, shuffle} from "lodash";
 import {Difficulty, Exam, InstructorGender, SpeakingExam, Variant, WritingExam} from "@/interfaces/exam";
 import {DeveloperUser, Stat, StudentUser, User} from "@/interfaces/user";
 import {Module} from "@/interfaces";
@@ -29,6 +29,23 @@ export async function getSpecificExams(ids: string[]) {
 	return exams;
 }
 
+export const getExamsByIds = async (ids: {module: Module; id: string}[]) => {
+	const groupedByModule = groupBy(ids, "module");
+	const exams: Exam[] = (
+		await Promise.all(
+			Object.keys(groupedByModule).map(
+				async (m) =>
+					await db
+						.collection(m)
+						.find<Exam>({id: {$in: groupedByModule[m]}})
+						.toArray(),
+			),
+		)
+	).flat();
+
+	return exams;
+};
+
 export const getExams = async (
 	db: Db,
 	module: Module,