API Reference > imodeljs-backend > Relationships > ExternalSourceAttachmentAttachesSource ExternalSourceAttachmentAttachesSource Class Beta Relates an ExternalSource to the RepositoryLink that it is persisted in. note The associated ECClass was added to the BisCore schema in version 1.0.13 Extends RelatedElement Methods Name Description constructor(externalSourceId: string, relClassName: string = ExternalSourceAttachmentAttachesSource.classFullName): ExternalSourceAttachmentAttachesSource Inherited methods Name Inherited from Description toJSON(): RelatedElementProps RelatedElement fromJSON(json?: RelatedElementProps): undefined | RelatedElement Static RelatedElement idFromJson(json: any): string Static RelatedElement Accept the value of a navigation property that might be in the shortened format of just an id or might be in the full RelatedElement format. Properties Name Type Description classFullName Static string Inherited properties Name Type Inherited from Description id Readonly string RelatedElement The Id of the element to which this element is related. none StaticReadonly RelatedElement RelatedElement Used to null out an existing navigation relationship. relClassName Readonly undefined | string RelatedElement The full className of the relationship class. Defined in core/backend/src/NavigationRelationship.ts Line 222 Last Updated: 11 June, 2024