Add quota and limit for events

Signed-off-by: Asai Neko <sugar@sne.moe>

data/attendance.go

@@ -141,6 +141,21 @@ func (self *Attendance) GetAttendanceListByEventId(ctx context.Context, eventId
 	return &result, err
 }
 
+func (self *Attendance) CountUsersByEventID(ctx context.Context, eventID uuid.UUID) (int64, error) {
+	var count int64
+
+	err := Database.WithContext(ctx).
+		Model(&Attendance{}).
+		Where("event_id = ?", eventID).
+		Count(&count).Error
+
+	if err != nil {
+		return 0, err
+	}
+
+	return count, nil
+}
+
 func (self *Attendance) Update(ctx context.Context, attendanceId uuid.UUID) (*Attendance, error) {
 	var attendance Attendance