public async Task <IActionResult> GetCollection([FromRoute] int id) { if (!ModelState.IsValid) { return(BadRequest(ModelState)); } var collection = await collectionRepository.FindById(id); if (collection == null) { return(NotFound()); } CollectionDTO cdto = new CollectionDTO(); cdto.CollectionId = collection.CollectionId; cdto.collectionName = collection.collectionName; cdto.aestheticParameter = collection.aestheticParameter; cdto.products = new List <ProductDTO>(); foreach (CollectionProduct cp in collection.CollectionProducts) { ProductDTO productDTO = productToDTO(cp.Product); cdto.products.Add(productDTO); } return(Ok(cdto)); }