Discussion on: Learn how you can use GraphQL in .NET Core and C#

public class LiteProfileModel {
    public Int32 ID { get; set; }
    public String FirstName { get; set; }
    public String LastName { get; set; }
    public Int32 Bookings { get; set; }
}

public class ProfileService {
    private readonly IUnitOfWork _unitOfWork;

    public ProfileService(IUnitOfWork unitOfWork) => this._unitOfWork = unitOfWork;

    public LiteProfileModel[] GetLiteProfileByEmailAddress(String emailAddress)
    {
        return this._unitOfWork.Profiles
            .Get(filter: profile => profile
            .Where(p => p.emailAddress == emailAddress)
            .Select(p => new LiteProfileModel 
            {
                ID = p.ID,
                FirstName = p.FirstName,
                LastName = p.LastName, 
                Bookings = p.Booking.Count()
            })
            .ToArray();
    }
}



public class LiteProfileApiModel {
    public Int32 ID { get; set; }
    public String FirstName { get; set; }
    public String LastName { get; set; }
    public Int32 Bookings { get; set; }
}

public class ProfileController : ApiController
{
    private readonly IProfileService _profileService;
    private readonly IMapper _mapper;

    public ProfileController(IProfileService profileService)
    {
        var config = new MapperConfiguration(cfg => {
            cfg.CreateMap<LiteProfileApiModel, LiteProfileModel>();
        });

        this._profileService = profileService;
        this._mapper = config.CreateMapper();
    }

    public LiteProfileApiModel[] Lookup(String emailAddress)
    {
        var results = this._profileService.GetLiteProfileByEmailAddress(emailAddress);
        return this._mapper.Map<LiteProfileApiModel>(results);
    }
}