Enhance the MVC "using-method-result" example. Prev: update to version 8.5.0

Prev Commit: 49ee8f2d75 [formerly 6a3579f2500fc715d7dc606478960946dcade61d]

Changelog: https://github.com/kataras/iris/blob/master/HISTORY.md#mo-09-october-2017--v850

This example is updated with the current commit: https://github.com/kataras/iris/tree/master/_examples/mvc/using-output-result


Former-commit-id: 29486ef014b3667fa1c7c66e11c8e95c76a37e57

mvc/activator/binder.go

@@ -69,6 +69,16 @@ func (b *binder) lookup(elem reflect.Type) (fields []field.Field) {
 		}
 
 		matcher := func(elemField reflect.StructField) bool {
+			// If the controller's field is interface then check
+			// if the given binded value implements that interface.
+			// i.e MovieController { service services.MoviesController /* interface */ }
+			// app.Controller("/", new(MovieController),
+			// services.NewMovieMemoryController(...))
+			// *MovieMemoryService type
+			// that implements the MovieService interface.
+			if elemField.Type.Kind() == reflect.Interface {
+				return value.Type().Implements(elemField.Type)
+			}
 			return elemField.Type == value.Type()
 		}