Gorm doesn't insert false value into database for boolean field

gorm-insert-bug-in-boolean-field.go

package main

import (
	"fmt"

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

var DB *gorm.DB

type Post struct {
	Title           string
	CommentsEnabled bool `sql:"default:true"`
}

func panicIfErr(err error) {
	if err != nil {
		panic(err)
	}
}

func init() {
	db, err := gorm.Open("postgres", "user=hui dbname=gorm_test sslmode=disable")
	panicIfErr(err)
	DB = &db

	DB.AutoMigrate(&Post{})
}

func main() {
	post := Post{Title: "A test post", CommentsEnabled: false}

	err := DB.Debug().Create(&post).Error
	panicIfErr(err)

    // DB log: INSERT INTO "posts" ("title") VALUES ('A test post') RETURNING "posts".*
    // Output: true
	fmt.Println(post.CommentsEnabled)
}