fix(attendance): display absent participants even if added via group

fixes #2618

src/app/child-dev-project/attendance/dashboard-widgets/attendance-week-dashboard/attendance-week-dashboard.component.spec.ts

@@ -90,6 +90,47 @@ describe("AttendanceWeekDashboardComponent", () => {
     ]);
   });
 
+  it("should display children also if added via activity group or manually", async () => {
+    const absentChild = new TestEntity();
+    const mondayLastWeek = moment().startOf("isoWeek").subtract(7, "days");
+    const e1 = EventNote.create(mondayLastWeek.toDate());
+    const e2 = EventNote.create(moment(e1.date).add(1, "day").toDate());
+    const absentStatus = defaultAttendanceStatusTypes.find(
+      (s) => s.countAs === AttendanceLogicalStatus.ABSENT,
+    );
+    [e1, e2].forEach((e) => {
+      e.addChild(absentChild);
+      e.getAttendance(absentChild).status = absentStatus;
+    });
+    const activity = new RecurringActivity();
+    delete activity.participants; // no participants set directly on RecurringActivity
+    const attendance = ActivityAttendance.create(new Date(), [e1, e2]);
+    attendance.activity = activity;
+    mockAttendanceService.getAllActivityAttendancesForPeriod.and.resolveTo([
+      attendance,
+    ]);
+
+    await component.ngOnInit();
+
+    expect(component.entries).toEqual([
+      [
+        {
+          childId: absentChild.getId(),
+          activity: activity,
+          attendanceDays: [
+            // sundays are excluded
+            e1.getAttendance(absentChild),
+            e2.getAttendance(absentChild),
+            undefined,
+            undefined,
+            undefined,
+            undefined,
+          ],
+        },
+      ],
+    ]);
+  });
+
   function expectTimePeriodCalled(from: moment.Moment, to: moment.Moment) {
     mockAttendanceService.getAllActivityAttendancesForPeriod.calls.reset();
 

src/app/child-dev-project/attendance/dashboard-widgets/attendance-week-dashboard/attendance-week-dashboard.component.ts

@@ -140,7 +140,7 @@ export class AttendanceWeekDashboardComponent
     }
 
     const results: AttendanceWeekRow[] = [];
-    for (const participant of att.activity.participants) {
+    for (const participant of att.participants) {
       const eventAttendances = [];
 
       let day = moment(from);

src/app/child-dev-project/attendance/model/activity-attendance.ts

@@ -53,6 +53,15 @@ export class ActivityAttendance extends Entity {
    */
   activity: RecurringActivity;
 
+  /**
+   * List of (actual, recorded in at least one event) participants.
+   */
+  get participants(): string[] {
+    return Array.from(
+      new Set(this.events.flatMap((event) => event.children)),
+    );
+  }
+
   /**
    * Mapping child ids to a map with all *logical* status as object keys and their counts as values.
    */