Uses MongoDB's GridFS to manage binary contents of your LoopBack 4 application. Full TypeScript support. Works simply with Node.js Buffer objects.
Add the loopback-gridfs dependency to your project:
npm install loopback-gridfsSimply create a new LoopBack 4 repository which inherits from GridFSRepository. The first parameter to super in the constructor is the bucket name, the second one is your existing Mongo data source. The following code would go into src/repositories/document-contents.repository.ts and that repository can then be injected into LoopBack 4 controllers, services etc. like any other.
import { juggler } from '@loopback/repository';
import { GridFSRepository } from 'loopback-gridfs';
export class MyFilesRepository extends GridFSRepository {
constructor(@inject('datasources.mongo') dataSource: juggler.DataSource) {
super('MyFiles', dataSource);
}
}| Method signature | Description |
|---|---|
async upload(fileBuffer: Buffer, filename: string): Promise<GridFSFile> |
Uploads the specified buffer to the bucket using the specified filename and returns details about the uploaded file. |
async uploadIgnoreDuplicate(fileBuffer: Buffer, filename: string): Promise<GridFSFile | undefined> |
Same as upload, but does nothing and returns undefined if any file with the given name already exists. |
async download(filename: string): Promise<Buffer> |
Downloads a file using its filename. |
async exists(filename: string): Promise<boolean> |
Returns a boolean indicating whether any file with the specified name exists. |
interface GridFSFile {
_id: ObjectId;
length: number;
chunkSize: number;
uploadDate: Date;
filename: string;
md5?: string;
metadata?: {
container: string;
mimetype: string;
extension: string;
};
}MIT