Resolving .Call Usage Issue in reflect Package

When utilizing the .Call function within the reflect package, it's crucial to adhere to the required parameter format. This article will guide you through the process of correctly using the .Call function and manipulating the in variable to cater to the target method.

In the sample code provided:

params := "some map[string][]string"
in := make([]reflect.Value,0)
return_values := reflect.ValueOf(&controller_ref).MethodByName(action_name).Call(in)

The in variable is initialized as an empty slice. As the method you intend to call expects a single parameter of type map[string][]string, the in slice should contain one reflect.Value instance holding this map.

To rectify this issue, the correct approach is to create a map and then convert it to a reflect.Value using reflect.ValueOf. Here's the adjusted code:

m := map[string][]string{"foo": []string{"bar"}}
in := []reflect.Value{reflect.ValueOf(m)}

return_values := reflect.ValueOf(&controller_ref).MethodByName(action_name).Call(in)

With this modification, the in variable will correctly pass the map to the target method, ensuring the desired function call succeeds.