Add translation to GET and POST routes with Int and String parameters

[mdmoura]

Hello,

I am having a few problems to translate the following two routes:

[Route("documents"), HttpGet]
public virtual ActionResult Documents(Int32 page = 1)  { }

[Route("documents"), HttpPost]
public virtual ActionResult Documents(String query, Int32 page = 1)  { }

Basically the first route gets a paged list of documents, using page = 1 when not specified. And the second also accepts a string query to filter the documents.

So for translation I am using the following:

.ForAction(x => x.Documents(), new Type[] { typeof(Int32) }).AddTranslation("documentos")
.ForAction(x => x.Documents(), new Type[] { typeof(String), typeof(Int32) }).AddTranslation("documentos")

But I get the errors: An expression tree may not contain a call or invocation that uses optional arguments
An expression tree may not contain a call or invocation that uses optional arguments

I tried a few variations of this but I always get an error.

Any idea what might be wrong?

Thank You, Miguel

[Dresel]

These are limitations of the expression tree api (http://stackoverflow.com/questions/12413583/an-expression-tree-may-not-contain-a-call-or-invocation-that-uses-optional-argum).

You should be able to call it like this

.ForAction(x => x.Documents(0), new Type[] { typeof(Int32) }).AddTranslation("documentos")
.ForAction(x => x.Documents(null, 0), new Type[] { typeof(String), typeof(Int32) }).AddTranslation("documentos")

The function is used for name extraction:

public RouteTranslator<T> ForAction(Expression<Func<T, object>> expression, Type[] actionArguments)
{
    MethodCallExpression methodCall = expression.Body as MethodCallExpression;

    if (methodCall == null)
    {
        throw new ArgumentException("Expression must be a MethodCallExpression", "expression");
    }

    ForAction(methodCall.Method.Name, actionArguments);

    return this;
}

So you cannot use it with default arguments. You could also use ForAction(string):

.ForAction("Documents", new Type[] { typeof(Int32) }).AddTranslation("documentos")
.ForAction("Documents", new Type[] { typeof(String), typeof(Int32) }).AddTranslation("documentos")

If you are working with T4MVC you could use the ActionName so that you do not use magic strings.