Create a record and add relationship through the httpPost Web Api

Question

When creating a new record in the tab I need to take the ID of my main screen and send along with the new object. Currently I have this code:

    public async Task<IHttpActionResult> PostMenuProduct(MenuProduct MenuProduct)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        db.MenuProducts.Add(MenuProduct);
        await db.SaveChangesAsync();

        if (MenuProduct.MenuIdAux != null)
        {
            RelationshipMenuProductWithMenu relationship = new RelationshipMenuProductWithMenu
            {
                MenuProductId = MenuProduct.Id,
                MenuId = Convert.ToInt32(MenuProduct.MenuIdAux)
            };

            await AddRelationshipMenuProductWithMenu(relationship);
        }

        return CreatedAtRoute("DefaultApi", new { id = MenuProduct.Id }, MenuProduct);
    }

In this case I add MenuIdAux in the model to send together with the new object the id of my main screen. How I could create this relationship without having to add this parameter to my model MenuProduct? I tried to pass as parameter in the post but the HttpPost did not accept.

Answer 1

Two ways:

1. Creating a Viewmodel identical to your Model, with one more parameter

public class MenuProductViewMode {
    public int MenuIdAux { get; set; }

    // Coloque aqui os outros parâmetros do Model
}

Mount the Model inside the method:

public async Task<IHttpActionResult> PostMenuProduct(MenuProductViewModel viewModel)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }

    var menuProduct = new MenuProduct();
    // Faça todas as atribuições de viewModel para o seu Model aqui

    db.MenuProducts.Add(MenuProduct);
    await db.SaveChangesAsync();

    ...
}

2. Passing as Action parameter

This way is not as good as the first because the variable is free, but it works.

Put as argument the following:

public async Task<IHttpActionResult> PostMenuProduct(MenuProduct MenuProduct, int MenuIdAux) { ... }

Place a field in your upload JSON called MenuIdAux that the bind will be done automatically.