如何在Golang中处理具有未设置值的补丁请求

Question

I am working on a patch restful request that the body json contain some omitted value while sending to golang. Since an unset value will lead the golang struct become default value. So I would like to know if there are any solution to deal with patch request omit data?

As I know, a basic type like string / int cannot be nullable in golang. there are different approach to deal with unset value patch request. For example:

1. using pointer to deal with null problem

   type User struct {
       Name *string
   }
   

2. using nullable library

   type User struct {
       Name  sql.NullString
   }
   

3. using map[string][]interface{} to see if the value is set

Is there any better solution to deal with nullable value inside struct? since this 3 should be work around to deal with the nullable value.

Answer 1

Use a pointer along with the omitempty tag. This way you can differentiate between an unset value, nil, and an intentional zero value ("", false, 0).

type User struct {
    Name *string `json:"name,omitempty"`
}

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