'datetime', 'event_data' => 'array', ]; public function serializedUnit() { return $this->belongsTo(SerializedUnit::class, 'serialized_unit_id'); } public function component() { return $this->belongsTo(SerializedUnitComponent::class, 'serialized_unit_component_id'); } public function performedBy() { return $this->belongsTo(User::class, 'performed_by'); } }