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 [];

      const parkingStructures = await parkingRepository.getParkingStructures();
      return parkingStructures.map((structure) => {
        return {
          ...structure,
          systemId: parent.systemId
        };
      });
    },
    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;

      const parkingStructure = await parkingRepository.getParkingStructureById(args.id);
      return parkingStructure ? {
        ...parkingStructure,
        systemId: parent.systemId,
      } : null;
    },
  }
}