json copy

Author: shuxian

json/json.go

@@ -0,0 +1,27 @@
+package json
+
+import (
+	"encoding/json"
+	"reflect"
+)
+
+// Copy makes a new object which has same field key and value from 'src'
+func Copy(dst interface{}, src interface{}) (err error) {
+
+	if dst == nil || (reflect.ValueOf(dst).Kind() == reflect.Ptr && reflect.ValueOf(dst).IsNil()) {
+		dst = reflect.New(reflect.TypeOf(dst))
+	}
+	if src == nil || (reflect.ValueOf(src).Kind() == reflect.Ptr && reflect.ValueOf(src).IsNil()) {
+		src = reflect.New(reflect.TypeOf(src))
+	}
+
+	bytes, err := json.Marshal(src)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(bytes, dst)
+	if err != nil {
+		return
+	}
+	return nil
+}