Generate new object with mapping Automapper

I have a POST request in my controller Product like this:

[HttpPost("/product")]
public async Task<IActionResult> CreateProduct([FromBody] ProductRequest productCreate)
{
    var response = await _productService.CreateProduct(_mapper.Map<Product>(productCreate));
    return Ok(_mapper.Map<ProductResponse>(response));
}

ProductRequest has the following structure:

public class ProductRequest
{
    public string Name { get; set; }
    public string Description { get; set; }
    public decimal? Price { get; set; }
}

I want to map this object ProductRequest to an object with Automapper named Product who has the following structure:

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public List<ProductPrice> Prices { get; set; }
}

Where:
ProductRequest.Name => Product.Name
ProductRequest.Description => Product.Description

I know how to do that but I don’t know how to use ProductRequest.Price and create a new instance of ProductPrice.Price.

ProductPrice has the following structure:

public class ProductPrice
{
    public int Id { get; set; }
    public int ProductId { get; set; }        
    public decimal Price { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime? EndDate { get; set; }
}

So when my Product reach the method Create in ProductService, this has a new object ProductPrice with the value of ProductRequest.Price in Product.ProductPrice.Price

>Solution :

You can try a mapping profile such as this using AfterMap and relying on the mapper internally to map both the outer object as well as the inner one:

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        this.CreateMap<ProductRequest, ProductPrice>()
            .ForMember(p => p.StartDate, o => o.MapFrom(_ => DateTime.Now));

        this.CreateMap<ProductRequest, Product>()
            .AfterMap((request, product, context) =>
            {
                product.Prices = new() { context.Mapper.Map<ProductPrice>(request) };
            });
    }
}