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go - accessing struct fields from embedded struct

I want to define a method on a struct for validating http request. but I have some problems about accessing struct fields.

there is my code.

package main

import "log"

type ReqAbstract struct{}

func (r *ReqAbstract) Validate() error {
    log.Printf("%+v", r)
    return nil
}
func (r *ReqAbstract) Validate2(req interface{}) error {
    log.Printf("%+v", req)
    return nil
}

type NewPostReq struct {
    ReqAbstract
    Title string
}

func main() {
    request := &NewPostReq{Title: "Example Title"}

    request.Validate()
    request.Validate2(request)
}

When I run this code, I get the below result

2015/07/21 13:59:50 &{}
2015/07/21 13:59:50 &{ReqAbstract:{} Title:Example Title}

is there any way to access struct fields on Validate() method like Validate2() method?

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