'date', 'expires_at' => 'date', ]; public function installedAsset() { return $this->belongsTo(CustomerInstalledAsset::class, 'installed_asset_id'); } public function component() { return $this->belongsTo(SerializedUnitComponent::class, 'serialized_unit_component_id'); } public function warranty() { return $this->belongsTo(Warranty::class, 'warranty_id'); } }