Golang未设置结构字段

Question

In Golang, I have below Struct with three fields

type Person struct {
   name string
   age  int
   rank int
}

For Processing, I need a rank field, but for output, I want to exclude the rank field from struct as I am directly passing above struct to JSON encoder to throw a response.

Is there any way by which I can unset rank field from Struct?

Answer 1

To unset a field, assign its zero value to it, like:

var p Person
p.rank = 0

Also know that if you want to use Person to work with JSON, you have to export the fields, unexported fields are not processed by the encoding/json package, so change Person to:

type Person struct {
    Name string
    Age  int
    rank int
}

This alone will make rank left out from JSON processing, as it is unexported.

If you need to export the rank field too, then use the json:"-" tag value to exclude an exported field from JSON processing:

type Person struct {
    Name string
    Age  int
    Rank int `json:"-"`
}