AntiPatterns in Vapor 3

nestedMap_antipattern.swift

// assuming a route such as /parents/Parent.parameter/children/

func addChildtoParent(_ req: Request) throws -> Future<Child> {
  return try req.parameters.next(Parent.self).flatMap(to: Child.self) { parent in
      return try req.content.decode(Child.self).flatMap{ child in
        child.parentId = try parent.requireId()
        return try child.save(on:req)
      }
  }
}

This is an anti-pattern. Use instead Async's own flatmap(to: Result.type, FutureA, FutureB).