package main

import (
	"database/sql/driver"
	"encoding/json"

	"github.com/jinzhu/gorm"
	_ "github.com/lib/pq"
)

type JSONB map[string]interface{}

func (j JSONB) Value() (driver.Value, error) {
	valueString, err := json.Marshal(j)
	return string(valueString), err
}

func (j *JSONB) Scan(value interface{}) error {
	if err := json.Unmarshal(value.([]byte), &j); err != nil {
		return err
	}
	return nil
}

type User struct {
	gorm.Model
	Info JSONB `sql:"type:jsonb"`
}

func main() {
	db, _ := gorm.Open("postgres", "user=myuser password=mypassword dbname=mydbname sslmode=disable")

	db.CreateTable(&User{})
	db.Create(&User{Info: JSONB{"age":  27, "name": "Yan"}})
}