add extensions mothed for get string value form object

extensions/reflect.go

@@ -0,0 +1,39 @@
+package extensions
+
+import (
+	"fmt"
+	"reflect"
+)
+
+func GetStringFieldPointer(obj interface{}, fields ...string) *string {
+	v := reflect.ValueOf(obj)
+	for _, field := range fields {
+		if v.Kind() == reflect.Ptr && !v.IsNil() {
+			v = v.Elem()
+		} else {
+			return nil
+		}
+		v = v.FieldByName(field)
+		if !v.IsValid() {
+			return nil
+		}
+	}
+	if v.Kind() == reflect.Ptr && !v.IsNil() {
+		val := v.Interface().(*string)
+		return val
+	}
+	if v.Kind() == reflect.String {
+		val := v.String()
+		return &val
+	}
+	fmt.Println(v.Kind() == reflect.String)
+	return nil
+}
+
+func GetStringFieldStruct(obj interface{}, fields ...string) string {
+	v := GetStringFieldPointer(obj, fields...)
+	if v == nil {
+		return ""
+	}
+	return *v
+}