How to convert ODataQueryOptions<DtoType> to ODataQueryOptions<EntityType> to query the underlying storage? - asp.net-core

Question

I have a webapi controller using ProductDTO type for clients but the repository is using a Product type.
I would like to use odata on my endpoint. I receive the ODataQueryOptions parameter and I want to pass it to repository (implemented using CosmosDB).
I cant seem to figure out how to convert from ODataQueryOptions<ProductDTO> to ODataQueryOptions<Product>.
[Route("api/[controller]")]
public class ProductsController<ProductsDTO, Product> : ControllerBase
{
IRepository<Product> _repository;
IMapper _mapper;
[HttpGet]
public async Task<ActionResult<IList<ProductDTO>>> Get(ODataQueryOptions<ProductDTO> queryOptions)
{
var mappedQueryOptions = ... // convert 'queryOptions' to ODataQueryOptions<Product> ???
var products = await _repository.Get(mappedQueryOptions);
return Ok(_mapper.Map<IEnumerable<Product>, IEnumerable<ProductDTO>>(products));
}
}
In my aspnetcore service composition I create and inject automapper
var configuration = new MapperConfiguration(cfg =>
{
cfg.AddProfile(new ProductProfile());
cfg.AddExpressionMapping();
});
internal class ProductProfile : Profile
{
public ProductProfile()
{
CreateMap<Product, ProductDto>().ReverseMap();
}
}
I managed to extract the queryoptions filter as a lambda expression Expression<Func<Product, bool>> (using automapper MapExpression) and passed it to repository , that works to a certain extent but I want to get the select , top, skip, etc. as well.
Any suggestions on how that could be done?

Answer 1

can you review the example?
[ODataRouteComponent("api")]
public class UsersController : ODataController
{
#region ctor
private readonly ILogger<UsersController> _logger;
private readonly IMapper _mapper;
private readonly UserManager<AspNetUser> _userManager;
public UsersController(IMapper mapper,
UserManager<AspNetUser> userManager,
ILogger<UsersController> logger)
{
_mapper = mapper;
_userManager = userManager;
_logger = logger;
}
#endregion
[HttpGet]
[EnableQuery(PageSize = 10)]
public async Task<IActionResult> Get(ODataQueryOptions<UserDto> options)
{
var user = await _userManager.GetUserAsync(User);
_logger.LogInformation("{UserUserName} is getting all users", user.UserName);
return Ok(await _userManager.Users.GetAsync(_mapper, options));
}
[HttpGet]
[EnableQuery]
public async Task<IActionResult> Get(int key, ODataQueryOptions<UserDto> options)
{
var user = await _userManager.GetUserAsync(User);
_logger.LogInformation("{UserUserName} is getting user with id {Key}", user.UserName, key.ToString());
return Ok(_userManager.Users.Get(_mapper, options).FirstOrDefault(x => x.Id == key));
}
}
services.AddControllers(opt =>{}).AddOData((opt, _) =>
{
opt.EnableQueryFeatures().AddRouteComponents("api", EdmModelBuilder.GetEdmModelv1());
});
public class MappingProfile : Profile
{
public MappingProfile() : base(nameof(WebUI))
{
CreateMap<AspNetUser, UserDto>();
}
}
internal static class EdmModelBuilder
{
internal static IEdmModel GetEdmModelv1()
{
ODataConventionModelBuilder builder = new();
builder.EnableLowerCamelCase();
#region UserDto
builder.EntitySet<UserDto>(nameof(DataListContext.Users))
.EntityType
.Page(25, 15);
var f5 = builder.Function("Get");
f5.Parameter<int>("key").Required();
f5.ReturnsFromEntitySet<UserDto>(nameof(DataListContext.Users));
#endregion
return builder.GetEdmModel();
}
}