Fs02/grimoire

package changeset

import (
    "reflect"
    "strings"
)

// PutDefaultErrorMessage is the default error message for PutDefault.
var PutDefaultErrorMessage = "{field} is invalid"

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

    if typ, exist := ch.types[field]; exist {
        valTyp := reflect.TypeOf(value)
        if valTyp.ConvertibleTo(typ) {
            if (ch.params == nil || !ch.params.Exists(field)) && // no input
                ch.changes[field] == nil && // no change
                isZero(ch.values[field]) { // existing value is zero value
                ch.changes[field] = value
            }
            return
        }
    }

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