func (p PrefixTransform) ConvertKey(k ds.Key) ds.Key {
	return p.Prefix.Child(k)
}
ConvertKey adds the prefix.
package keytransform
import ds "github.com/ipfs/go-datastore"
type Pair struct {
	Convert KeyMapping
	Invert  KeyMapping
}
func (t *Pair) ConvertKey(k ds.Key) ds.Key {
	return t.Convert(k)
}
func (t *Pair) InvertKey(k ds.Key) ds.Key {
	return t.Invert(k)
}
var _ KeyTransform = (*Pair)(nil)
type PrefixTransform struct {
	Prefix ds.Key
}