go - 如何以非手动方式更改所有结构标签的前缀？

Question

假设我有以下内容:

type My struct{
  First string `xml:"first"`
  Last string `xml:"name"`
  ...many more tags...
}

我想将所有标签的前缀更改为“mycustomtag”。我看过https://stackoverflow.com/a/42549826/522962但这描述了一种手动方式，您可以手动定义带有标签的第二个结构。我如何自动执行此操作？

例如我想以下面的内容结束，但由于有很多很多字段，我该怎么做才能不必手动完成？:

// how do I do the next part automagically????
func (m *My) MarshalJSON() ([]byte, error) {
    type alias struct {
        First string `mycustomtag:"first"`
        Last string `mycustomtag:"name"`
        ...many more tags...
    }
    var a alias = alias(*m)
    return json.Marshal(&a)
}

Answer 1

如果这不是在运行时，而是静态地修改您的代码源，您可以使用 fatih/gomodifytags .

参见“Writing a Go Tool to Parse and Modify Struct Tags”

Struct field tags are an important part of encode/decode types, especially when using packages such as encoding/json.
However, modifying tags is repetitive, cumbersome and open to human errors.
We can make it easy to modify tags with an automated tool that is written for this sole purpose.