'datetime', 'checked_in_at' => 'datetime', 'status' => 'integer', 'form_answers' => 'array', ]; public function course(): BelongsTo { return $this->belongsTo(Course::class); } public function miniappUser(): BelongsTo { return $this->belongsTo(MiniappUser::class); } public function session(): BelongsTo { return $this->belongsTo(CourseSession::class, 'course_session_id'); } public function checkins(): HasMany { return $this->hasMany(CourseSignupCheckin::class); } }