output

panic: invalid sql type AttributeMap (map) for sqlite3

goroutine 1 [running]:
github.com/jinzhu/gorm.(*sqlite3).DataTypeOf(0xc0001a05c0, 0xc0000e9e00, 0x6, 0x6d68b8)
        /home/dan/gopath/pkg/mod/github.com/jinzhu/gorm@v1.9.15/dialect_sqlite3.go:64 +0x751
github.com/jinzhu/gorm.(*Scope).createTable(0xc0001a2180, 0xc000192698)
        /home/dan/gopath/pkg/mod/github.com/jinzhu/gorm@v1.9.15/scope.go:1173 +0x27c
github.com/jinzhu/gorm.(*Scope).autoMigrate(0xc0001a2180, 0x683640)
        /home/dan/gopath/pkg/mod/github.com/jinzhu/gorm@v1.9.15/scope.go:1269 +0x400
github.com/jinzhu/gorm.(*DB).AutoMigrate(0xc000197860, 0xc0000d9f40, 0x1, 0x1, 0x1)
        /home/dan/gopath/pkg/mod/github.com/jinzhu/gorm@v1.9.15/main.go:689 +0x96
main.main()
        /home/dan/main.go:37 +0x103
exit status 2

wtf.go

package main

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

	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/sqlite"
)

type Record struct {
	Attributes AttributeMap
}

// AttributeMap is a map of attributes that is encoded to and from JSON within the database.
type AttributeMap map[string]interface{}

func (a *AttributeMap) Value() (driver.Value, error) {
	return json.Marshal(*a)
}

func (a *AttributeMap) Scan(value interface{}) error {
	b, ok := value.([]byte)
	if !ok {
		// Wasn't bytes!
		return fmt.Errorf("expected bytes, received %T", value)
	}

	return json.Unmarshal(b, a)
}

func main() {
	db, err := gorm.Open("sqlite3", ":memory:")
	must(err)
	must(db.AutoMigrate(&Record{}).Error)
}