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46 lines
857 B
46 lines
857 B
3 years ago
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package utils
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import (
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"fmt"
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"reflect"
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)
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// copy a by b b->a
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func CopyStructFields(a interface{}, b interface{}, fields ...string) (err error) {
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at := reflect.TypeOf(a)
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av := reflect.ValueOf(a)
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bt := reflect.TypeOf(b)
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bv := reflect.ValueOf(b)
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if at.Kind() != reflect.Ptr {
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err = fmt.Errorf("a must be a struct pointer")
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return err
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}
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av = reflect.ValueOf(av.Interface())
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_fields := make([]string, 0)
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if len(fields) > 0 {
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_fields = fields
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} else {
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for i := 0; i < bv.NumField(); i++ {
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_fields = append(_fields, bt.Field(i).Name)
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}
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}
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if len(_fields) == 0 {
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err = fmt.Errorf("no fields to copy")
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return err
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}
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for i := 0; i < len(_fields); i++ {
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name := _fields[i]
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f := av.Elem().FieldByName(name)
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bValue := bv.FieldByName(name)
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if f.IsValid() && f.Kind() == bValue.Kind() {
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f.Set(bValue)
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}
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}
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return nil
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}
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