Fs02/grimoire

package changeset

import (
    "reflect"
    "strings"
)

// PutChangeErrorMessage is the default error message for PutChange.
var PutChangeErrorMessage = "{field} is invalid"

// PutChange to changeset.
func PutChange(ch *Changeset, field string, value interface{}, opts ...Option) {
    options := Options{
        message: PutChangeErrorMessage,
    }
    options.apply(opts)

    if typ, exist := ch.types[field]; exist {
        if value != (interface{})(nil) {
            valTyp := reflect.TypeOf(value)
            if valTyp.Kind() == reflect.Ptr {
                valTyp = valTyp.Elem()
            }

            if valTyp.ConvertibleTo(typ) {
                ch.changes[field] = value
                return
            }
        } else {
            ch.changes[field] = reflect.Zero(reflect.PtrTo(typ)).Interface()
            return
        }
    }

    msg := strings.Replace(options.message, "{field}", field, 1)
    AddError(ch, field, msg)
}