Embedding parent relation

📚 Official Books Server Side Swift with Vapor
1

Is it possible to fetch child then fetch parent relation and put in the custom Content model with both parent and child type? And how to register in router with controller?

2

@pyae sure, you can nest your futures and pull out relations after you get each part. Putting into into a custom Content type is easy once you have anything. Registering with a controller depends on what things you need (such as parameters).

Take a look at vapor-til/WebsiteController.swift at main · raywenderlich/vapor-til · GitHub as an example. This returns Future<View>, but there’s no reason why you couldn’t just change that to UserContext and make UserContext conform to Content - make sense?

3

@0xtim Thanks for reply and pointing out what I am missing from the book.

return Planet.query(on: req).all().flatMap(to: [SuperGalaxy].self) { planets in
	for planet in planets {
		let galaxy = planet.galaxy.get(on: req)
		let superGalaxy = superGalaxy(galaxy: galaxy, planet: planet)
		superGalaxies.append(superGalaxy)
	}

and I don’t know how to convert array instance of SuperGalaxy to Future

struct SuperGalaxy: Content {
	var galaxy: Future<Galaxy>
	var planet: Planet
}

and that model of Content does not conform to protocol Decodable

4 
return Planet.query(on: req).all().flatMap(to: [SuperGalaxy].self) { planets in
	var superGalaxies = [Future<SuperGalaxy>]()
	for planet in planets {
		superGalaxies.append(planet.galaxy.get(on: req).map(to: SuperGalaxy.self) { galaxy in
			return SuperGalaxy(galaxy: galaxy, planet: planet)
		})
	}
	return superGalaxies.flatten(on: req)
}

Courtesy of @anthness and me because he typed from the phone and got typos. Hope this would help someone someday :star2:

1 Like
5

Nice work! Glad you fixed it