CRUD Controller protocol for Vapor 4 and Swift 5.2. It adds basic REST API for CRUD-ing any model with an UUID identifier. It is based on the default controller example, but has not been tested yet. A controller struct can conform to this protocol by adding typealias M for your Model, and adding a variable called path that determines subpath of …

CRUDController.swift

import Fluent
import Vapor

protocol CRUDController: RouteCollection {
    associatedtype M: Model, Content where M.IDValue == UUID
    
    var path: [PathComponent] { get set }
    init()
}

extension CRUDController {
    init(path: PathComponent...) {
        self.init()
        self.path = path
    }
    
    func boot(routes: RoutesBuilder) throws {
        let router = routes.grouped(path)
        router.get(use: index)
        router.post(use: create)
        router.delete(":id", use: delete)
    }
    
    func index(req: Request) throws -> EventLoopFuture<[M]> {
        return M.query(on: req.db).all()
    }
    
    func create(req: Request) throws -> EventLoopFuture<M> {
        let entry = try req.content.decode(M.self)
        return entry.save(on: req.db).map { entry }
    }
    
    func delete(req: Request) throws -> EventLoopFuture<HTTPStatus> {
        return M.find(req.parameters.get("id"), on: req.db)
            .unwrap(or: Abort(.notFound))
            .flatMap { $0.delete(on: req.db) }
            .transform(to: .ok)
    }
}

/*
struct ExampleController: CRUDController {
    typealias M = ExampleModel
    
    var path: [PathComponent] = [] // You need to provide a default value for path, or an init().
}
*/