feat: verbinding student submissions

backend/src/services/students.ts

@@ -2,12 +2,14 @@ import {
     getClassRepository,
     getGroupRepository,
     getStudentRepository,
+    getSubmissionRepository,
 } from '../data/repositories.js';
 import { Class } from '../entities/classes/class.entity.js';
 import { Student } from '../entities/users/student.entity.js';
 import { AssignmentDTO } from '../interfaces/assignment.js';
 import { ClassDTO, mapToClassDTO } from '../interfaces/class.js';
 import { GroupDTO, mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
+import { mapToSubmissionDTO, SubmissionDTO } from '../interfaces/submission.js';
 import { getAllAssignments } from './assignments.js';
 import { UserService } from './users.js';
 
@@ -74,3 +76,19 @@ export async function getStudentGroups(username: string, full: boolean): Promise
 
     return groups.map(mapToGroupDTOId);
 }
+
+export async function getStudentSubmissions(
+    username: string
+): Promise<SubmissionDTO[]> {
+    const studentRepository = getStudentRepository();
+    const student = await studentRepository.findByUsername(username);
+
+    if (!student) {
+        return [];
+    }
+
+    const submissionRepository = getSubmissionRepository();
+    const submissions = await submissionRepository.findAllSubmissionsForStudent(student);
+
+    return submissions.map(mapToSubmissionDTO);
+}