enumerated.go.tmpl

package {{.Package}}

import (
	"database/sql/driver"
	"encoding/json"
	"fmt"
	"strings"
)

// {{.Type}}Enum is the status code of an {{.Type}} (must be int64)
type {{.Type}}Enum int64

const (
	// {{.Type}}EnumUnknown is the default which means something is fucked up
	{{.Type}}EnumUnknown {{.Type}}Enum = iota
)

func (x {{.Type}}Enum) String() string {
	return map[{{.Type}}Enum]string{
		{{.Type}}EnumUnknown:   "{{.Type}}EnumUnknown",
	}[x]
}

// Scan is used for writing {{.Type}} to the database
func (x *{{.Type}}Enum) Scan(value interface{}) error {
	db := value.([]uint8)
	*x = map[string]{{.Type}}Enum{
		"{{.Type}}EnumUnknown":   {{.Type}}EnumUnknown,
	}[string(db)]
	return nil
}

// Value is used for reading {{.Type}} from the database
func (x {{.Type}}Enum) Value() (driver.Value, error) {
	return x.String(), nil
}

// MarshalJSON - custom marshal method to convert {{.Type}} to JSON
func (x *{{.Type}}Enum) MarshalJSON() ([]byte, error) {
	return json.Marshal(strings.ReplaceAll(x.String(), "{{.Type}}", ""))
}

// UnmarshalJSON - custom unmarshal to convert string into {{.Type}}Enum
func (x *{{.Type}}Enum) UnmarshalJSON(b []byte) error {
	var value string
	err := json.Unmarshal(b, &value)
	if err != nil {
		return err
	}
	return x.Scan([]uint8((fmt.Sprintf("{{.Type}}%s", strings.Title(value)))))
}

• https://blog.carlmjohnson.net/post/2016-11-27-how-to-use-go-generate/
• https://github.com/golang/tools/blob/master/cmd/stringer/stringer.go

pointer receivers are likely wrong 🤔