[REST] Default parameter taking precedence

[matthieukern]

Hi! I have something that looks like a bug in the REST API generator. When I have this code :

//server
module app;

import vibe.d;

interface ILlama {
    @bodyParam("llama", "llama")
    string updateLlama(string llama = null);
}

class Llama : ILlama {
    string updateLlama(string llama) {
        logInfo("Llama: %s", llama);
        return llama;
    }
}

shared static this() {
    setLogLevel(LogLevel.debug_);

    auto settings = new HTTPServerSettings;
    settings.port = 8080;
    settings.bindAddresses = ["127.0.0.1"];

    auto router = new URLRouter;
    router.registerRestInterface(new Llama);

    listenHTTP(settings, router);
}


//client
module app;

import vibe.d;

interface ILlama {
    string updateLlama(string llama = null);
}

shared static this() {
    runTask({
        auto api = new RestInterfaceClient!ILlama("http://127.0.0.1:8080/");

        logInfo("Llama: %s", api.updateLlama("llama"));
    });
}

In the code above, the parameter's default value of updateLlama seems to take precedence on the PATCH request's parameter, so I get a null value instead of the desired one. When I remove the default parameter, the request works fine and the argument is correctly deserialized.