Hello I want to match a route in NestJS like this:
@Controller('posts')
export class PostsController {
@Get(:id)
getPostById() {}
@Get(:slug)
getPostBySlug() {}
}
The problem is the request nevers hit the slug route, how can I configure the routes to make the id only match with numbers and the second only match with letters and dashes?
Thank you very much :)
This isn't possible, because when Express or Fastify sets up the router for this, it's just looking at something that matches a regex, and there's no qualifier that says "this is specifically a slug" or "this is definitely an id" so all Express or Fastify can do is match the first route. You would need to set up either a switch in your controller or service to call either method depending on the param, or you would need to make the routes identifiable before the use of the URL parameter. @Get('/id/:id') or @Get('/slug/:slug')
It looks like there is a path-to-regex package in @nest/common dependencies and I checked - you can really use it.
https://www.npmjs.com/package/path-to-regexp
Now you're able to make id match only numbers by setting regex:
@Get('/:id(\\d+)')
I didn't found the feature description in NestJS official docs, but it works. My @nest/common package versions is 8.4.1.
This isn't possible with Nest's routing decorators, however you can access the underlying express or fastify instance and create a route using their native methods:
https://docs.nestjs.com/faq/http-adapter