project-inter-server/src/resolvers/ParkingSystemResolvers.ts

import { Resolvers } from "../generated/graphql";
import { ServerContext } from "../ServerContext";

export const ParkingSystemResolvers: Resolvers<ServerContext> = {
  ParkingSystem: {
    parkingStructures: async (parent, _args, contextValue, _info) => {
      const system = contextValue.findSystemById(parent.systemId);
      if (!system) {
        return [];
      }
      const parkingRepository = system.parkingRepository;
      if (!parkingRepository) return [];

      return await parkingRepository.getParkingStructures();
    },
    parkingStructure: async (parent, args, contextValue, info) => {
      if (!args.id) return null;

      const system = contextValue.findSystemById(parent.systemId);
      if (!system) {
        return null;
      }
      const parkingRepository = system.parkingRepository;
      if (!parkingRepository) return null;

      return await parkingRepository.getParkingStructureById(args.id);
    },
  }
}