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defaults.go
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defaults.go
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package utils
import (
"fmt"
"reflect"
"github.com/creasty/defaults"
)
// SetDefaults set default values
func SetDefaults(ptr interface{}) error {
err := defaults.Set(ptr)
if err != nil {
return fmt.Errorf("%v: %s", ptr, err.Error())
}
v := reflect.ValueOf(ptr).Elem()
t := v.Type()
for i := 0; i < t.NumField(); i++ {
tf := t.Field(i)
vf := v.Field(i)
if tf.Type.Kind() == reflect.Slice {
for j := 0; j < vf.Len(); j++ {
item := vf.Index(j)
if item.Kind() != reflect.Struct {
continue
}
err := setDefaults(item)
if err != nil {
return err
}
}
}
if tf.Type.Kind() == reflect.Map {
for _, k := range vf.MapKeys() {
item := vf.MapIndex(k)
if item.Kind() != reflect.Struct {
continue
}
tmp := reflect.New(item.Type())
tmp.Elem().Set(item)
err := setDefaults(tmp.Elem())
vf.SetMapIndex(k, tmp.Elem())
if err != nil {
return err
}
}
}
}
return nil
}
func setDefaults(v reflect.Value) error {
tmp := reflect.New(v.Type())
tmp.Elem().Set(v)
err := SetDefaults(tmp.Interface())
if err != nil {
return err
}
v.Set(tmp.Elem())
return nil
}