'boolean', 'approved_at' => 'datetime', ]; } public function request(): BelongsTo { return $this->belongsTo(InvestigationRequest::class, 'investigation_request_id'); } public function values(): HasMany { return $this->hasMany(InvestigationResultValue::class, 'investigation_result_id'); } public function attachments(): HasMany { return $this->hasMany(InvestigationAttachment::class, 'investigation_result_id'); } }